Semi-automatic fully 3D printable feeder

[alex]

The main idea of this feeder is taken out of the SMD-Taxi machine (see video: https://www.youtube.com/watch?v=BfcFKsf5NEs and some more photos here: http://www.smd-taxi.ru/#!features/xnre5 ).

Designing this feeder was a little challenge. I wanted it to be as simple and as universal as possible. So here are the main specs:
1)Width=tape width+3mm (actually this is 1mm more than tape reel and gives ~100% space usage efficiency).
2)Fully 3D printable(or milled). Needs a few M2 screws and two springs to assemble.
3)Feeders are easy to stack into any configuration and are easily adaptable to different width.
4)SMT tape thickness up to 5mm, no need to tune.
5)Precision and repeatability does not depend on precision of actuator (head) move. The tape is always moved to one fixed position.

Here is a small video of how it works:
https://www.youtube.com/watch?v=XnrMpQHFJ6c

There is a bonus feature - this feeder can be easily redesigned to fully automatic feeder with usage of cheap RC servo as an actuator(or something more reliable). The key is in usage of vertical rotation axis, instead of horizontal as in most of the feeders.
Here is a video with very early feeder prototype with servo glued to it just for fun and proof of concept:
https://www.youtube.com/watch?v=BvcR2atKbBQ

At this moment clear tape removal is done just by 150 gram load hanging on it, but rotating rubber roller with flat springs pressing up the tape to it is planned. Need to make reel holder first :)

The design is in some kind of alpha stage and probably will be changed. Also more testing should be done.

The one of the problems is getting flat spring. I use a spring tape found inside a roulette by cutting the piece of needed size. But unfortunately it too weak, need to use it in double layer configuration. Any ideas where to get stronger one?

[Rich Obermeyer]

Hey Alex, Interesting, no electronics and cheap.  The 3 things I need in a feeder.

Can get a close up of how the hole in the tape is latched and moved forward for each movement.

Rubberband is only thing that needs to be improved. By tomorrow you will have tons of suggestions for that. 

Thx for sharing

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[Jason von Nieda]

Hi Alex,

Excellent work! This looks really nice and I am thrilled to see that is it 3D printable! I think you've got a winner on your hands!

Do you intend to publish the plans? I'd love to print one out and try it out.

For the flat spring, try searching for "flat spring steel" or "spring steel strip". Should be able to find some local results near you. One option would be a heavy duty tape measure which you could cut down.

Keep up the great work!

Jason

[alex]

суббота, 2 апреля 2016 г., 1:49:35 UTC+3 пользователь Maddog написал:

Hey Alex, Interesting, no electronics and cheap.  The 3 things I need in a feeder.

Can get a close up of how the hole in the tape is latched and moved forward for each movement.

Rubberband is only thing that needs to be improved. By tomorrow you will have tons of suggestions for that. 

Thx for sharing

Rubberband can be replaced by metal spring of course. But I nave tons of rubberbunds and just a couple of springs of needed size. Current revision assumes very simple change of it, so this is definitely not a problem for me at this moment.


суббота, 2 апреля 2016 г., 1:51:32 UTC+3 пользователь Jason von Nieda написал:

Hi Alex,

Excellent work! This looks really nice and I am thrilled to see that is it 3D printable! I think you've got a winner on your hands!

Do you intend to publish the plans? I'd love to print one out and try it out.

For the flat spring, try searching for "flat spring steel" or "spring steel strip". Should be able to find some local results near you. One option would be a heavy duty tape measure which you could cut down.

Keep up the great work!

Jason

 
Thank you, Jason!
I plan to publish all the materials, but just give me a few days for more testing and preparing some files and instructions :)
At least I want to try rubber roll clear tape puller instead of weight applied.

Thank you for suggestions about springs, I'll try to search that.

[Anthony Webb]

Very clever Alex!  I am keen to see how the tape cover roller works out.  I like how you hooked it up to a small RC servo as well.  This is a great design thank you for sharing.  Like Rich I would like to see a close up of how the hole in the tape is latched and moved forward for each movement.  Thanks!

[Anthony Webb]

I'd be interested is some digital files when you have them as well.  One modification that I would need and I am sure others will ask about is the tapes that have components that hang down below the tape.  ( some of mine are even like 8mm! ) I think it would not be too hard to add a void under the tape for taller parts to pass?

[SMdude]

Another way to actuate the lever could be with a motor with a cam so it advances the feeder once per rotation. It would not be hard to set it up for automatic operation either...

[Rich Obermeyer]

Adding a motor is a substantial change to the big picture. The beauty of this design is no electronics and very cheap.  No milling or stamping so.  everybody can find a 3D printer nearby.  

You could have any number of feeders anywhere with no software driver complications.  Seems like we always want to make simple things complicated for no real benefit other than we can.

It has been shown to work on 2 different trivial designs.  Let's see if we can work through it before we over complicate it.

On Apr 1, 2016, at 11:34 PM, SMdude <spiteri...@gmail.com> wrote:

Another way to actuate the lever could be with a motor with a cam so it advances the feeder once per rotation. It would not be hard to set it up for automatic operation either...

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[Andrew Frazer]

I dont' like the 3d printing bit, simply because it will wear out over time.. however this is easily modifable to be milled from some alliuminum stock. I think though i'd want to have the push rod being pushed by a device other than than the main head.

3d printed is very quick and a great way to get started though!

[Rich Obermeyer]

I would think the only thing that is subject significant wear is the point that gets pressed into hole to advance and align the tape.  Placed a steel rod or screw into there instead would increase the life I think.

What else is going to wear out?

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[Andrew Frazer]

On Sunday, April 3, 2016 at 8:59:00 AM UTC+12, Maddog wrote:

I would think the only thing that is subject significant wear is the point that gets pressed into hole to advance and align the tape.  Placed a steel rod or screw into there instead would increase the life I think.

What else is going to wear out?

The paper tape over the plastic. Its deceptively abrasive.   It might be acceptable if you are only running 10's of reels through it.   and 3d print does give you the ability to just print another one when you want, so there are plus's to doing that as well.

[Ray Kholodovsky]

Alex, very excited to test as well, looking forward to you posting the files.  I would ask that you also provide the CAD source in addition to the STL because we all will probably need to mount these to a different rail size or surface.  

спасибо,
Ray

[Mark Harris]

I've seen feeders that have a leaf spring below the component channel, and a leaf spring above - the sprocket/hole has it's own support, so the top spring ensures the tape is pushed down onto the sprocket well (and keeps the components at a consistent height) with the lower spring supporting the component section of the reel no matter what depth it is. Diodes/SOT/RF Transistor packages come to mind in antitstatic plastic for components that sit lower and have a thinner sprocket tape section.

How does the feeder work with plastic tapes? Even if it is not great for plastic tapes, at least its a cheap option for paper!

On 2 April 2016 at 00:17, Anthony Webb <anthon...@gmail.com> wrote:

I'd be interested is some digital files when you have them as well.  One modification that I would need and I am sure others will ask about is the tapes that have components that hang down below the tape.  ( some of mine are even like 8mm! ) I think it would not be too hard to add a void under the tape for taller parts to pass?

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[Andrew Frazer]

This needs some more work, but i think there is a solution with a small modification, using a pin slot.

[Anthony Webb]

Really great work Andrew!  I love the simplicity.  Once you have it to a point you are comfortable sharing please do!

[Rich Obermeyer]

Anthony, I think you meant Alex.

Alex is still working on the reel mount and the cover tape removal.

Might be awhile for finished design.

The demo shows the design uses a very long roller over multiple feeders for cover tape removal.

That's not going to be 3D printable (easily anyway).

Is there something we can buy that will work for this?

Some how a metal pin will need to be used to force the more abrasive tapes forward without frequent adjustment or replacement.

How durable does this design need to be?  2 reels, 50 reels, 1000 reels?  It is DIY right?

On Apr 3, 2016, at 10:13 AM, Anthony Webb <anthon...@gmail.com> wrote:

Really great work Andrew!  I love the simplicity.  Once you have it to a point you are comfortable sharing please do!

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[alex]

Hi all!
The work on this feeder is still in active progress, but it comes to the end at this moment with design polishing.

A few interesting notes:

1) Rubber rod + flat spring seems to work very well for cover tape pulling. Tested this with manual rod rotation, but it's already connected to stepper. motor. I'll test it in auto mode in near future.
Rubber rod can be made very easily by taking standard M10 threaded stud and applying heat shrinking tube(rough type) above. The only question is how wearproof it is. Testing and time will show. Photo is applied.

2)  A few days I was thinking of flat spring source. Found lots of local companies selling it and as usual starting from a few tons. But all this time the answer was lying just on my table :)
It's binder clip! These are made from very elastic steel and one of the standard size is 51mm wide which is perfectly fit for the feeder. They also can be bought absolutely everywhere for very little money.

3)Pull pin. I tried plastic pin and metal pin. At this moment I consider using plastic ones at first feeder set. But this part of the feeder can be very easily replaced.
I pulled about 1000 components with it and didn't notice any visual wear of plastic.
Plastic ones are not printed directly (didn't try it but sharp edges is usually a bad idea for 3D printing). Some more than needed plastic is printed at the pin location and then it is being cut by a knife by two simple moves to desired configuration.

This is only short notice post, I'll give much more information and drawings in a few days. Just because I need to test everything and prepare pics/docs/instructions :)
At this moment I'm printing the 7th version of this feeder design.

[Ray Kholodovsky]

I'm enjoying the view that Andrew posted, which makes the design even more easy to understand.  

If this pans out as a reliable solution, which I really hope it does, I'd start milling them and could also make it as a sandwich of several milled flat pieces if necessary.  

I didn't see the servo variant until just now, which is awesome. 

My goal is to have feeders cheap enough that I can store them with the reel as one for the lifetime of the reel.  This is probably the closest I have seen that is also simple enough.    Ideally that would mean each feeder having a price point in single digit US Dollars, and adding a servo to each would not be a problem.  Although it seems like if this was the feeder of choice the servo could be on the bar and attach and detach with a linkage (read: paperclip) as a feeder was put on/ taken off.  

I think I can make it self contained: make it stick farther towards the back so there is room to hold a reel, and add a small wheel at the top for the film take up.   Not sure how easy it would be for the motion to also index the wheel just enough.  I think another ratchet/ pinion linkage could accomplish this...

[Rich Obermeyer]

Ray, what's the obsession with adding a servo to the design?

As you say the current design is so cheap it will simply be attached to every reel you own.   Simply simple as it gets.

Adding a servo and then the electronics to drive and configuring a driver, would change that completely.

Something you see I am not?

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[Andrew Frazer]

This is *very* much an unfinished thing.    Two things i was trying to do, 

(1) I was trying to learn how Joints and motion worked in Fusion 360, as i've never done this before

(2) I was trying to understand how this thing worked.  Drawing it up seemed like the best way to do this..   

As it sits the motion is'nt quite right. SOme of the points need to be moved and changed, but  i think its doable.

Here is the fusion 360 link, where you can get the drawing.

http://a360.co/1pXS5nR

[Andrew Frazer]

If this pans out as a reliable solution, which I really hope it does, I'd start milling them and could also make it as a sandwich of several milled flat pieces if necessary.  

I was thinking that the back plate probalby can just be water jet cut. no precsion required there.

I didn't see the servo variant until just now, which is awesome. 

 

My goal is to have feeders cheap enough that I can store them with the reel as one for the lifetime of the reel.  This is probably the closest I have seen that is also simple enough.    Ideally that would mean each feeder having a price point in single digit US Dollars, and adding a servo to each would not be a problem.  Although it seems like if this was the feeder of choice the servo could be on the bar and attach and detach with a linkage (read: paperclip) as a feeder was put on/ taken off.  

My goal is to have a PNP with the potential to have 400+ reels on it.  So i never have to take anything off, uless it runs otu!

[Ray Kholodovsky]

Rich, 

I think obsession might be a tad too strong of a word, don't you?  :)

To clarify my stance, I said the following 2 things:

I missed the video of the servo driving the feeder from the original post until today. It's really cool.  I acknowledged that the servo could be fixed to the mounting rail (part of the machine, not the feeder, and attached to the feeder as part of the mounting process.  

Now, when I originally had the thought of the cheap feeder - reel combo, I figured it would cost around $10 each because at the time the only options were mechanical systems like this one but with metal gears, and systems that required a dedicated servo/ microswitch each.  And then there were the more expensive ideas that needed stepper motors per each, etc...  So I was quite happy with attaining a $10 price point relative to that time.  

With this design, I can mill this out of aluminum or a composite (they're all approx the same price) and we're probably still probably looking at single digits $ cost of materials.  Thus, adding a servo that costs less than $2 to the feeder itself didn't phase me. 

I didn't say anything about adding electronics to the feeder.  The servo wire could dangle freely and be connected to a common arduino driving a bank of these.

But since you asked, I could add a Max485 IC on a small pcb to each feeder along with some headers for in-out and have these all on an RS485 bus in the tens of cents price point.  

I acknowledge that cost does add up .  For the enterprising user, plastic only may be the way to go.  But if we got the reliability of this squared away and it was offered for sale as an "entry level feeder" to PnP beginners, I think people would certainly be willing to pay to have the servo and electronics on board such that it was a self contained, plug and play solution that did not require tinkering.  

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[Ray Kholodovsky]

Andrew, I'm with you on that.  I need to be PnPing with 30 tape/ reel inputs very soon.   I intend for my next machine to be much larger for what you suggest to be an option.  

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[Andrew Frazer]

A pair of parrallel arms will work much better, and will mean that it will self adjust to various tape heights. 

On Saturday, April 2, 2016 at 11:30:32 AM UTC+13, alex wrote:

[Anthony Webb]

Andrew, interesting, where are you pivot points on that model?  I'd love to see a little animation of the motion, looks slick though!  

As for making the feeders motor driven or bump driven. Ultimately I think I'd prefer not having to (needlessly) constantly bump the head of my machine.  The cost increase would be negligible, and the electronics would be dirt simple.  You can drive a little RC servo with a single digital pin.  Heck with a simple $12 TI launchpad CortexM4 and enough IO to run a bank of 30+ feeders with a single serial connection to OpenPNP makes it a no brainer.  I'd probably just make a little shield to plug the servos onto.

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[Ray Kholodovsky]

Anthony,

That's roughly what I was thinking, but with a plain old arduino or arduino mega.  Just feed it commands over usb-serial and it'll move the servos

Command being something like "/pnp/feeder0/slot3/advance" that way multiple heads/ systems can be on a single bus and understand when each is being addressed.  

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[Andrew Frazer]

On Monday, April 4, 2016 at 11:32:57 AM UTC+12, Anthony Webb wrote:

Andrew, interesting, where are you pivot points on that model?  I'd love to see a little animation of the motion, looks slick though!  

Still workign on it.. It needs some more work. I think i need to put a constraining pin on there somewhere, and a spring.. Not sure how to do springs in Fusion360

[Rich Obermeyer]

Still sounds like an obsession to me.

Not being critical, as I said just trying to get your perspective for adding all the complexity.  You can surely do what ever floats your boat.

If it was 3D printed then seldom would anyone need to buy one.

This thing would print for less than a dollar.

We have not yet considered the take up reel which hopefully is a 3D print project too. two pieces.

I see no reason it needs to milled unless of course you just want too or there are plans for some high volume use.  I saw no logical reason to add a servo that dangles there so electronics obviously is needed and unless you plan on limiting it to 2 feeders, the servo is not a simple interconnect with no driver issues.

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[alex]

I don't see any real benefits of using servo in this design. Hitting head is not a problem as for me. In fact it is not really hitting, just a little bit more force than usual and probably much less force than dynamic forces applied when head starts and stops moving at high speed. Time saving is also not critical. It would give just a few % time save. Just compare feed move to overall move to place a component - it's about 20mm compared to hundreds.
Servo will add a complexity and one more point for potential problems. Cheap RC servos are not reliable. How many times it will actuate before resistor in it wears out? 1000? 5000? 10000?

There is one disadvantage of this particular design. It's very dependent on head capability and configuration. When I made the first version - it worked good being pulled by hand but it couldn't be pushed by head. Z travel is very important. If you look at this video again:
https://www.youtube.com/watch?v=XnrMpQHFJ6c
you can notice two things.
1)When head pushes feeder the nozzle tip goes very close to it. In fact it goes between the feeders if multiple are installed.
2)When the component is pulled out of the tape the push bulk mounted on the head nearly hits the feeder, just a couple of mm left.

But even considering this issue I would first thing of installing one actuator(maybe a good servo) on the head rather than dozens on the feeders. Or better - just do more design work before making the head and all the machine :)

Some previous versions of this feeder are attached just for your interest.

[Andrew Frazer]

If you are following along, the fusion model is avaialble as well.

The correct motion path is now possible.

 

 

[Cri S]

Nice. Do you have tested the other system, where the spring advance the reel instead of the PNP head. What is the practical difference?

[Andrew Frazer]

I'm lookign for something that is easly manufacturable.

[Andrew Frazer]

I dont' have enough Fusion360 know now to produce an animation, and Fusion it seems does'nt allow me to create a spring..

However two screen shots showing the drag arm at the the two limits of its reach..   

I'm thinking that a leaf spring that hold the arm down will be the best option. Easy to install.

[Anthony Webb]

Hi Andrew, looking real good, question: what limits the motion?

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[Malte R.]

Hi, looks great. I likes the simple effectiveness of the SMDTaxi feeders. 3D printing something similar makes it easy to experiment. Any chance to get your files (either CAD or STL)? I'd like to give it a try :-)

[Rich Obermeyer]

@alex,  any plans to attach the reel to the feeder?

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<pit3.png>

<pit4.png>

<pit5.png>

<pit6.png>

<pit8.png>

[alex]

Sorry for the long silence.
I enclose a photo of feeder assembly. The entire assembly consists of feeders themselves, the side cover for the most right feeder and the extrusion holder. To assemble it you will also need the two M5 threaded rods and nuts. The entire assembly is fastened to the extrusion profile 2040 with T-nuts an screws.

Behind  the feeders passes a rod coupled with a stepper motor. This rod is covered with heat shrink tube and is used for pulling off the protective film from the smd tapes. I used a 10 mm rod, but it turned out to be too flexible, as a result, some of the flat springs don't supply enough tension to pull film. I plan to replace the rod with a thicker one. See how it works: https://youtu.be/WOmC0j6xhfM

To assemble each feeder you additionally need:
1) Two flat springs aprox 51mm long and width should be 3 mm smaller than the smd tape itself(5mm for 8mm tape). One spring presses the smd tape, and the second spring presses the cover film to the rod. I used standard binder clips for paper for 51mm width as spring source. 51mm width is perfect, just need to cut a strip of the correct size (be careful - after cutting it forms a very sharp cutting edges). Then you need to bend the strip about 4mm at the end by 90 degree angle to form something like this |___________ and insert it into the feeder slot.
2) Four screws M2x8 (total length 10mm). See photos.
3) One rubber spring. I plan to replace the ones I used by silicon ones as my tend to wear.

Film pulling system may be replaced just by some kind of weight pulling the film down, or some kind of small reels for film on a rotating rod.

You may notice that pin for pulling tape looks a bit strange in 3D model. The reason is that it's hard to 3D print a sharp angle of good quality so I print some extra plastic and then cut it by knife to desired shape. See photos for explanation. Plastic pin (I used ABS) seems to be reliable enough. I used it for feeding about 2-3k parts and it has no visible wear. But still it is possible to modify this pin by inserting a small metal rod into drilled plastic(I used thick copper wire for testing). Anyway this pins can be easily replaced without touching the feeder itself.

The design is still in some kind of alpha stage and need massive testing.

In attached zip folder you can find stl files for 8, 12, 15mm feeders, side cap and extrusion holder and source file in dwg format (I know autocad it's not the best software for 3d modelling but it's faster for me to draw models in software that I know).

[alex]

Photos of pulling pin before and after cutting + metal version.

[Rich Obermeyer]

Impressive!

On Fri, May 20, 2016 at 4:41 PM, alex <al...@sai.msu.ru> wrote:

Photos of pulling pin before and after cutting + metal version.

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[Anthony Webb]

Very impressive indeed!

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/CAOvy4mbt097MNLTwxTkgJZwPNqNXy-bgg8jiB9dLNeQ5dA5kDQ%40mail.gmail.com.

[alex]

суббота, 21 мая 2016 г., 3:15:53 UTC+3 пользователь Maddog написал:

Impressive!

After reading automatic feeder thread these 3D printed colourful feeders look like a toy :)
But still, they are functional and cost about 1$ each which makes them suited for some diy machines.
Also I'm thinking of maybe making more precise version in future using aluminium milling and the same principle of operation.

[alex]

After some fighting with rotating rod in heat shrink tube I decided to move to another concept of protective tape removal.
I don't remember where I have first seen this idea, but it is well illustrated at robotdigg
http://www.robotdigg.com/product/560/Desktop+PNP+Belt+Roller
Though 150$ price is a bit big for me for such simple thing, more to that there is no any specification and quantity options, so I decided to make my own reels.

Construction is very simple. Just two 3D printed parts, one flat spring and two screws.
It works good in hands. Will try it on the machine in near future.

Does anyone uses a system like this? Any pitfalls?

[Jason von Nieda]

Looking good Alex. Is the purpose of the spring to create friction against the axle?

Jason

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[alex]

Thanks!

Yes, we need some constant friction of known value +/-. All the reels will be on one rotating axis. This axis rotates when each feed operation occurs, no matter of which feeder. So for every feeder except active one the reels will just slip on the axis. On the active feeder the reel will rotate pulling protective film off the smt tape, because friction force is higher that film peel off force.

[Jason von Nieda]

Very nice Alex. Looking forward to hearing how well it works! 

Jason

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/6221e40d-ef0c-4a46-aa87-3b7dd5d33f92%40googlegroups.com.

[Frank Herrmann]

Alex, this is awesome! I send your design to one of my 3d guys and make some tests with them. ut for the first time, very nice & simpe design. Thank you that you share your 3d models with us!.

Frank

[alexander...@gmail.com]

Hi.

I'm very new to the idea of DIY PNP and just discovered OpenPNP and some of the machines people have built. Can you please advise if OpenPNP supports the extra movement to 'trigger' the feeder shown here or did you need to modify OpenPNP to do this? Just trying to understand what's possible as-is while daydreaming about building a machine.

Thanks.

Alex

[Jason von Nieda]

Hi Alex,

Supporting a feeder like this requires the addition of a very simple feeder class in OpenPnP. If you aren't a programmer and you want to use a feeder like this then perhaps Alex (who made the feeder) can share his code, or you can ask for help here and someone will help you get it going. If you *are* a programmer, have a look at the Feeder interface to see what needs to be done to make one: 

https://github.com/openpnp/openpnp/blob/develop/src/main/java/org/openpnp/spi/Feeder.java

It's really just implementing the feed() method to push the lever forward. 

Jason

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/1d9de982-8566-48e1-a7fb-76e76157e25e%40googlegroups.com.

[DAniel Dumitru]

REally interesting !
I need to update my Zeva's feeders.
Please tell me : I see that some parts are simple. Those can be
lasercutted ?
BR,
Daniel

La 21.05.2016 02:40, alex a scris:
> re assembly consists of feeders themselves, the side cover for the
> most right feeder and the extrusion holder. To assemble it you will
> also need the two M5 threaded rods and nuts. The entire assembly is
> fastened to the extrusion profile 2040 with T-nuts an screws.
>
> Behind the feeders passes a rod coupled with a stepper motor. This
> rod is covered with heat shrink tube and is used for pulling off the
> protective film from the smd tapes. I used a 10 mm rod, but it turned
> out to be too flexible, as a result, some of the flat springs don't
> supply enough tension to pull film. I plan to replace the rod with a
> thicker one. See how it works: https://youtu.be/WOmC0j6xhfM
>
> To assemble each feeder you additionally need:
> 1) Two flat springs aprox 51mm long and width should be 3 mm smaller
> than the smd tape itself(5mm for 8mm tape). One spring presses the smd
> tape, and the second spring presses the cover film to the rod. I used
> standard binder clips for paper for 51mm width as spring source. 51mm
> width is perfect, just need to cut a strip of the correct size (be
> careful - after cutting it forms a very sharp cutting edges). Then you
> need to bend the strip about 4mm at the end by 90 degree angle to form
> something like this |___________ and insert it into the feeder slot.
> 2) Four screws M2x8 (total length 10mm). See photos.
> 3) One rubber spring. I plan to replace the ones I used by silicon
> ones as my tend to wear.

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[Rich Obermeyer]

Alex,

How are you planning to deal with wider tapes?

Can you add a spacer for wider tape?

Looks like a good solution.

Keep us up to date.

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<RAxpg_BcsUo.jpg>

<s-G35hNkq50.jpg>

[alex]

It's even more simple, I just used DragFeeder. It has start and stop position and pick position. Thats all you need to feed this type of feeder. I also used Actuator functionality for film removal rod rotation by stepper.

Currently I'm working on a new version of feeders which are simpler and better. As soon as I have good results I'll post information.

[Malte R.]

Hi Alex,

thanks for sharing your design. It looks great and I think it might turn out to be a very good alternative to relatively expensive, motorized feeders.

Regarding the tape pulling, I like the design used by SmallSMT:



Source: http://www.smallsmt.biz/home/vision-placer-vp-2x00d/

They use "gears" to pull the tape. The larger ones are all mounted to a common axle and simultaneously driven by a stepper - just like in your design.

Instead of the flat springs in your design, they use the small gears to create the friction. Each small gear is being held by a spring with adjustable tension.

Should be fairly easy to print something like this - what do you think?

Best regards
Malte

[Frank Herrmann]

Hello Alex,

today i got my 3d printed Parts just for tests and will complete this Feeder. one Question, can u make a photo from the side of this feeder with SMD Tape and spring loads. this will help me to construct this nice thing. Here the Foto in orange :)

[Malte R.]

Hello Frank,

I also printed one - this is how mine looks from the side:



Please note that I am not using the rear spring; will build a different mechanism to pull the cover tape.

I drilled up the screw holes and used M3 sized screws as I had no M2 available.



Tape in this picture is empty wih no cover tape.

Hope this helps
Malte

[Frank Herrmann]

Hello Malte,

many thanks for ur photos, this help me a lot. What do u plan for cover tape pulling?

[Malte R.]

I will use simple weights for now. My plan is to build a pulling mechanism similar to the one made by SmallSMT - see the picture I shared earlier in this thread.

[mojalovaa1]

Malte.R what you are use like spring ?

How much cost that feeder if you are produce it for me ?
 

[alex]

You can print this feeder by yourself on your 3D printer if you have one or find any commercial 3D printing lab near you. The volume of plastic nneded for one 8mm feeder is about 20-25 cm^3

[alex]

I'm now working on the version 2 of this feeder. It's even smaller and simpler and has a couple of bugs fixed. I'll present it as soon as I wipe off dust from my pnp machine :(

[Frank Herrmann]

Maybe you have a 3d print guy not so far from you. I use http://3dhubs.com to find someone he can print this for me.

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2016-06-12 22:37 GMT+02:00 mojalovaa1 <moja...@gmail.com>:

Malte.R what you are use like spring ?

How much cost that feeder if you are produce it for me ?
 

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[mojalovaa1]

Malte.R , I not see that have stl file or  something like that for share , sorry if I m mistake ?
Can you please share  that file with us ?

All so if is possible write what you are use for spring , I m look for buy  some metal for spring but cant found it .

[Malte R.]

Hi moja,

that is not my design but it was made by alex.

You can find his STL earlier in this thread; he posted it on May 21st.

He also gave recommendations on the spring to use, in his case he cut a strip from paper binder clips.

I just used a piece from some sheet metal I had in my shop for this prototype. If I make more of these, I will probably buy some special spring steel. Will have to experiment with the thickness though.

The part is reasonably easy to print and assemble; just find yourself a 3D printer nearby and you should able to make yours :-D

Good luck and have fun!

Malte

[matt]

Hi all,

I've got a laser mounted to the head to aid in positioning (as well as
the camera), whats the easiest way of defining this in OpenPNP - so i
can select the laser and do goto and it will automatically add the
offset to the co-ordinate (or subtract)

Thanks

Matt

[Jason von Nieda]

Hi Matt,

There isn't really a great way to do this currently. The "Go To" buttons are specifically for the selected nozzle and the head camera. The only way I can think of doing this without adding code is to define it as a nozzle, give it a nozzle tip, set the nozzle tip to not use the changer, not allow incompatible packages and mark no packages as compatible. This should cause the planner to basically ignore the nozzle for jobs and then you can select the nozzle from the dropdown in the upper left and use the "Go To" buttons. 

It's not pretty, but that's the only way to do it without adding another button, I think.

Jason

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[alex]

Here is a video of new feeder setup in work: https://youtu.be/IDiFrP3rNAg
The main change is the film pulling mechanism. I described it here:
https://groups.google.com/d/msg/openpnp/B90C2JUtN30/dLVMLNHEAQAJ
It works really fine. The only issue is that I need to increase torque of rotating rod. Currently it is coupled directly with NEMA17 shaft, but it struggles to rotate the rod when all reels are blocked(normal operation). I'll solve this by adding two GT2 pulleys, one small and one big and a belt ring.
The overall construction is very simple and the reels for the film can be 3d printed.

The feeders itself were also reworked. They became smaller due to removing back part with the second spring and removing guiding "channel" for wasted tape. I've also made a special hook for the top end of the band, so it's more convenient than previous version. One more change is 45 degree chamfer at the front of the feeder which gives more freedom for nozzle moves and compatible with Juki nozzles. I also replaced 3mm wall by 2mm which seems to be durable enough. This 1mm change becomes noticeable when using many feeders. on my machine it'll
 give space for 3 additional 8mm feeders.

I'll post stl files soon.

[mojalovaa1]

Hi Alex , can you add more image for see that feeders?

[alex]

Hi mojalovaa1!

Photo applied.

[Jason von Nieda]

Hi Alex,

The feeder is looking really great! Have you considered setting up a little webpage or GitHub repo or something so people can have a single place to find the files and information? If you would do that I could add a link from the OpenPnP Hardware page. I think people would love to be able to find this easier.

The easiest thing would probably be a GitHub repo. It's free to set up and you can upload the files right from the web interface. No Git required.

Jason

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[Rich Obermeyer]

Alex, those cover take up reels seem too large to me.  How did you calculate the reel size?  Is there really that much cover plastic on a reel of parts?

Thx

[alex]

One standard SMT reel has 5000 components with 4mm pitch, so total length of tape is 20 meters. It's thickness about 0..06-0.1mm. The inside diameter is 30mm. Then I just used online calculator to get roll diameter like this: http://www.handymath.com/cgi-bin/roll4.cgi?submit=Entry
It calculates that outside diameter of the roll will be 58mm. I made it 70mm to leave 6mm margin.

[alex]

Good idea Jason! I think I'll try to create GitHub repo for this.

[Robert Walter]

Don't waste your time copying this design of a common motor driving all tape peelers. It will end up being your major pain point. It is fine for larger components, but even 805 LED's danced all over the place with my machine that had this peeling system.

My $0.02 worth.

[alex]

Why would they jump if all the parts are covered by the tape at the moment when the motor rotates?
The only one part that is uncovered by this rotation can possibly "jump", but then there is no difference whether we use one common motor or individual ones.

[Jon Raymond]

alex,

Are you willing to share the stl's of your newest version for this feeder?  I have an idea of a different way of dealing with the tape I'd like to try.

[alex]

Hello Jon!

I'm currently finishing printing all the feeders for my machine (26 ones). Actually all feeders are done and nearly the half of the reels are done too. I want to install the full assembly and test it on the machine in real working environment to make sure that everything is ok, and then share all the files. The reason is that when I've tested previous version it was ok with one tape. But when I've assembled all of them, I've found some bugs, that could not be seen on the one feeder.
But if you really want these stl's and can't wait for a few days, I can publish them now :)

[mojalovaa1]

Hi folks

I m today design some feeder like  on this post , difference dimension  but need test it , on this moment  I not have 3D printer and if some one have  who wont try print it and test  can contact me  .

[Nando Petersen]

Perhaps you could find a ballpoint clip which does the job of the flat spring.

Am Samstag, 2. April 2016 00:30:32 UTC+2 schrieb alex:

The one of the problems is getting flat spring.

[Daniel]

HEllo Alex,

I hope that your project goes well.  I have bought a 3d printer (a kit in fact) and my first try would be to print those feeders.

Could you please share stl files for updated version of feeder and if is possible some advice's about how to print them since this would be my first print ?

Regarding tape peeling rolls I think that those can be more fast and ease lasercutted. If you want I can make them for you.

kind regards,

Daniel

[Daniel]

Regarding flat spring : I think that I have found a good source for those :

Please see image below : it's a starting spring for moto chain saw husyvarna but may be use from any other model.

Check compatible consumables for low price.

Who need somethink like this I may send to him those since are cheap.

Measured width it's 6mm. But I can look for wider ... 

[Mark Harris]

If you're looking to find those online, they are called Constant Force Springs. Very common in all things that have a pull start, and very cheap in the r/c hobby industry. 

You might find them called Recoil Springs in relation to pull starters, but searching for that you're going to find mostly just springs for semi-automatic/automatic firearms which are completely different.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJL98&P=7 - less than $2

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[alex]

Hi folks!

I finally finished feeder development for my machine at this moment. Everything works good, though I did not tested it with 10000's placements yet :)

In attached files you can see the entire construction. Feel free to ask any questions. I'm also attaching source files(dwg...) and stl files for each feeder element.

For each feeder you'll need this four files:
-Xmm_body - the main body of the feeder for X width SMT tape
-Xmm_tip - the tip that pushes the tape for X width SMT tape
-arm - vertical arm that is being pushed by machine head, same for any tape width
-tip_connector - a small piece to connect arm and tip, same for any tape width

You'll also probably need:
-side_cap - a flat side cover for the most right feeder
-extrusion_holder - a clamp for attaching the whole feeder assembly to 2040 or 4040 extrusion by M5 screws. At least two pieces, one at each side of feeder assembly.

For each reel you'll need this two files:
-Xmm_reel - the main body of the reel for X width SMT tape
-reel_cap - second flat side of the reel, same for any tape width

[alex]

Hi Daniel!

My congratulations with 3D printer! I bought my for my PnP machine development and happy with it, though now I'm using it for a lot of tasks aside PnP machine.

This feeders does not require any special settings for 3D printing, so the best thing you can do is just follow general recommendations and instructions for your particular 3D printer model. Laser cutting is a great technology, but it is not as cheap as 3D printing for home use. So for me it's easier and faster to print some parts on my printer. But if you need high quantities it is definitely better choice.

[mojalovaa1]

Hi Alex

I m impressed with yours work , very nice .

Can you make some video where we can see how that look  in work ?

[matt]

Hi alex

Many thanks for this - is it possible to do a 24mm/32mm variant?

Much appreciated, looks good.

Matt

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[Frank Herrmann]

Hi Alex,

great work. Here your files in autodesk360 DWG viewer:

Feeder:

https://a360.autodesk.com/viewer/#id/dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6YTM2MHZpZXdlci90MTQ2ODQxMDE3NTAyM18wMjk2Njc4Njk5NzU2MzMzMS5kd2c%3d

Reel:

https://a360.autodesk.com/viewer/#id/dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6YTM2MHZpZXdlci90MTQ2ODQxMDQyNDAyMF8wOTI4ODUzNzg0NTE1NTg4NC5kd2c%3d

I have your first version at home ... but good, thats the first final version. 

Thank you very much to share your design with us.

Frank

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[Daniel Dumitru]

Frank, please import again in Fusion360 since dimensions are wrong. far too big !  probably you should have selected mm instead of inch.

BR,

Daniel

[Malte R.]

Hi Alex,

thanks for sharing the latest version of your feeders.

How do you attach the reels to the shaft, so that they can slip but there is still enough friction to pull the tape?

Looking at the reel, it seems you may have a second spring there? How do you adjust its tension?

Regards
Malte

[matt]

Hi Daniel

Are you going to use this feeder on your Juki?

Matt

On 2016-07-13 12:59, Daniel Dumitru wrote:
> Frank, please import again in Fusion360 since dimensions are wrong.
> far too big ! probably you should have selected mm instead of inch.
> BR,
> Daniel
>
> On Wed, Jul 13, 2016 at 2:52 PM, Frank Herrmann <xpi...@gmail.com>
> wrote:
>
>> Hi Alex,
>>
>> great work. Here your files in autodesk360 DWG viewer:
>>
>> Feeder:
>>
> https://a360.autodesk.com/viewer/#id/dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6YTM2MHZpZXdlci90MTQ2ODQxMDE3NTAyM18wMjk2Njc4Njk5NzU2MzMzMS5kd2c%3d

>> [1]
>>
>> Reel:
>>
> https://a360.autodesk.com/viewer/#id/dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6YTM2MHZpZXdlci90MTQ2ODQxMDQyNDAyMF8wOTI4ODUzNzg0NTE1NTg4NC5kd2c%3d
>> [2]

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[alex]

Please see this post: https://groups.google.com/d/msg/openpnp/B90C2JUtN30/dLVMLNHEAQAJ
The construction is very simple it just uses one flat spring 4mm width.
Rod diameter is 10mm.
https://06413065735717202521.googlegroups.com/attach/1c4d12c4cb574/s-G35hNkq50.jpg?part=0.2&view=1&vt=ANaJVrH5Mgpy8t_YkmvPTA6XvFtfOF2RXK9OWAb3yKUpGtgriVitwYjLRZcehy8mzL25guNm6EDRjUqUVJzc284V_NxP6EUY-7rHBtcgZUbJ3w0ACtsvdCU

[Daniel Dumitru]

Hi Matt,

Absolutely !  I cannot wait longer for this !

I have also to add head rotation as well , I have to add uplooking camera ...

I don't remember , do you retrofit as well a Zeva PM ?

BR,

Daniel

[matt]

Hi Daniel

Yes - i've got a variant of Peters head design (rack/pinion) with 2x
nema 8s mounted on my PM460 now - done away with the original head.

I'm also in the process of upgrading the original feeders so they don't
use the tape-advance pin, but a cheap $2 solenoid pushes the original
air-switch which is controlled by a PIC. I figured the original feeder
design is robust and fits nicely on the machine, so why not stick with
them. Not sure if thats the right approach though!

Matt

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> https://groups.google.com/d/msgid/openpnp/CAPU3koM0bOV1uCkqQN8bo%3DfNshdo35rSPazC6rjw-QWQQRtoFQ%40mail.gmail.com?utm_medium=email&utm_source=footer
> [2] https://groups.google.com/d/optout

[obiwanke...@gmail.com]

Matt, do you have a picture of the head on your PM460 ?, I'm working on a variant of Peter's design for mine. I was going to use a gang solenoid for our feeders and bypass the advance pin, individual solenoids may be less expensive, do you have a part number for your cheap solenoid ?

[Trampas Stern]

Alex,

Thanks for the designs! 

I was wondering if anyone thought about the take up reel holder as hinged design that could be clamped/snapped onto the rod without removing rod? 

[Airhead Bit]

On Wednesday, July 13, 2016 at 4:40:09 AM UTC-6, alex wrote:

Hi folks!
snip

I'm building a Micro Pick and Place (MPAP) and your design for a part feed will work well with the MPAP design goals, KISS and low cost yet functional 

Thanks for the ideas and effort! 

[Jason von Nieda]

Hi Airhead Bit, do you have a link for info on this MPAP? I've never heard of it.

Jason

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[Airhead Bit]

If you get a chance could you give us newbees an overview on printing your parts; One part at a time or many at a time? Can these be PLA parts? (Have a roll of that) A BOM for the hardware?

Thanks again.

On Friday, May 20, 2016 at 5:40:08 PM UTC-6, alex wrote:

Sorry for the long silence.
snip

[alex]

Hi Airhead!

3D printing for PnP machine does not differ from general printing of other parts. There are lots of manuals on the web and you probably should look for the manuals for your particular 3D printer.

PLA is a good plastic for most of the parts. There are two exceptions: high temperatures and post machining of parts. The only place with high temperature(may be) in PnP machine is steppers, so use ABS for parts holding the steppers if you need such and they heat above ~50C. Post machining of ABS is also a bit simpler ad ABS as not as elastic as PLA.

[Anthony Webb]

Curious if anyone has printed and play with any of the feeders Alex posted back in July?  I am going to give them a go to better understand how they work in my effort to find a suitable feeder for my machine.  If anyone has any updates or other designs that are printable I'm willing to spend the time playing with this until I am happy with the results.

[alex]

Hi Anthony!

I know that several people printed and used them. They wrote me some messages privately a while ago. Though I don't know if anyone completed a full set of this feeders for their machine, except of me.
The design proofed itself with the time. The main advantage is extremely low cost and simplicity. The main disadvantage is that this feeders in current design are not fast changeable and the process of installing tape in it is not fast and convenient. Also this design is for my particular machine and may need to be slightly changed in geometry for other machines.

[Paul Jones]

I’m in the process of doing that just now. It looks like the simplest solution to get up and running.

 

 

Paul.

 

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