Semi-automatic passive printable/castable feeder

[Дмитрий Голик]

Hello!

I invented some feeder. https://github.com/dining-philosopher/litefeeder https://www.youtube.com/watch?v=S1jxeCK4YC0 It is originally for liteplacer but maybe it will be useful with other machines.

[ma...@makr.zone]

Brilliant! Thanks for sharing.

_Mark

[Sandra Carroll]

Very simple and clean design and very nice

Sandra

Sent from my iPhone 7 Plus

On Oct 20, 2019, at 1:46 PM, "ma...@makr.zone" <ma...@makr.zone> wrote:



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[Bill Ruckman]

Very nice design!  I think you could improve it a bit by making the pivot joint a snap pivot like this.

--Bill

[Дмитрий Голик]

I do not think it is needed cos majority of the feeders will be stacked together, and for the last feeder you may attach one another feeder to act as stopper.

воскресенье, 20 октября 2019 г., 21:40:56 UTC+3 пользователь Bill Ruckman написал:

[Anthony Webb]

Trying to figure out what is actually advancing the tape and peeling the cover?

Sent from my iPhone

On Oct 20, 2019, at 1:02 PM, Дмитрий Голик <worm...@gmail.com> wrote:



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[Дмитрий Голик]

воскресенье, 20 октября 2019 г., 23:17:12 UTC+3 пользователь Anthony Webb написал:

Trying to figure out what is actually advancing the tape and peeling the cover?

Sent from my iPhone

On Oct 20, 2019, at 1:02 PM, Дмитрий Голик <worm...@gmail.com> wrote:



I do not think it is needed cos majority of the feeders will be stacked together, and for the last feeder you may attach one another feeder to act as stopper.

воскресенье, 20 октября 2019 г., 21:40:56 UTC+3 пользователь Bill Ruckman написал:

Very nice design!  I think you could improve it a bit by making the pivot joint a snap pivot like this.

--Bill

On Sunday, October 20, 2019 at 9:33:57 AM UTC-7, Дмитрий Голик wrote:

Hello!

I invented some feeder. https://github.com/dining-philosopher/litefeeder https://www.youtube.com/watch?v=S1jxeCK4YC0 It is originally for liteplacer but maybe it will be useful with other machines.

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[Mike Menci]

Dmitri,

Well done - simple and seams to be good fort the start..

All tapes are not flat - so the bottom - under tape would need a sloot for tapes with pockerts   -----/____/------- like this

and why does the needle part go deeper than the tape line is (Blue)? And a radious part under (orange) - some reson for that?

Good Start!

Mike

[Anthony Webb]

Ah, hey very clever! I’d love to try a design with a trough in the bottom to support plastic tapes as well!

Sent from my iPhone

On Oct 20, 2019, at 2:26 PM, Дмитрий Голик <worm...@gmail.com> wrote:



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[Дмитрий Голик]

Actually paper tapes are flat. I tried to make the design compatible both with paper and plastic tapes (however the version depicted in the manual is compatible with paper tapes only (and maybe slim plastic tapes), you can download it here https://liteplacer.com/phpBB/download/file.php?id=778 ). I did not cast the 40th version yet, but it seems that the big trough is not actually necessary, so maybe i will eliminate it in the next version.

The small trough is for the tooth to have room to move while the tape is absent. It plays no crucial role in normal operation.

воскресенье, 20 октября 2019 г., 23:30:29 UTC+3 пользователь Mike Menci написал:

[Mike Menci]

 Like this

[Дмитрий Голик]

It is a handle to lift the dog in case you want to move the tape backwards.

I watched the file you sent to me personally (is it secret or you pushed the wrong button?). I think it is a part of more complicated (electronic?) feeder and does not make much sense in my cheapo setup (and also does not fit within my 3d printer). I already made much simpler reel holding system that i think will work pretty well. I will post it tomorrow. Or maybe you have proposition for quick change system for whole feeder+reel assemblies?

понедельник, 21 октября 2019 г., 0:29:40 UTC+3 пользователь Mike Menci написал:

 Like this

[Tomislav Darlic]

This is one of the best ideas I've seen for a feeder. Simple and effective. Because of the stopper part it is probably very precise. 

Do you think this would work with the FDM printer using PLA or PETG? I might try doing one myself.

[Дмитрий Голик]

One russian woman actually did this and told me at the youtube comments. But one day i found that all the comments had gone. :( I suspect this happened cos youtube does not ask for confirmation when you delete comments, deletes all the thread when you delete initial comment and does not provide option to cancel the deletion.

понедельник, 21 октября 2019 г., 1:04:35 UTC+3 пользователь Tomislav Darlic написал:

[Mike Menci]

Hi all interested...

Draft of spool with 3V DC motor enclosed

DC motor has a spring clutch which slips if no tape cover is ready to pool.

On feeder there is a limit switch which activates 3V DC motor when Lever is pushed down and Motor starts rotating and ends rotating when lever is beck in top-start position,

This small motor I have tested on this feeder ; https://www.youtube.com/watch?v=aSf3S6qtWVo  and its working quite good!!

Some files enclosed

Hope thios helps somerbody to take it forward from here.

Contact me if you need any detals or Solidwork files for further work on feeder.

Mike

[Mike Menci]

Cover tape spool motor --- like this one -https://www.ebay.de/itm/Mini-Full-Metal-Gearbox-Gear-Motor-DC3V-12V-7-5RPM-30RPM-Slow-Speed-Large-Torque/283534633366?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2763.l2649

Plastic Black Gear should be replaced with Sool bearing .stl file above-redisigned for this motor..... Spring has a nut on top where required torque is set for cover tape pooling...

Mike

[Mike Menci]

Just a note to Open PnP belt driven Z heads- stepper used to lover/rise one or two heads in Z direction might not have the torque needed to trigger this feeder. Spring in feeder should be strong enough to turn the tape wheel when tape is pushed forward....
Mike

[Дмитрий Голик]

Hello Mike!

Nice design, but i personally do not think i will use something similar. Besides being too big for my 3d printer, it requires decent amount of wiring and 20*20 mm extrusion attached to the table in the right position, and also the film reels will overlap (so you need about 3 - 4 models with different positions of the reel). But i will love to see it working.

> Just a note to Open PnP belt driven Z heads- stepper used to lover/rise one or two heads in Z direction might not have the torque needed to trigger this feeder. Spring in feeder should be strong enough to turn the tape wheel when tape is pushed forward....

My feeder with 0.5*8*25 mm spring needs about 300 grams of force (3 N or 3/4 pounds). And i feel there is some room to reduce this value, so you can use 20 mm spring. I think it is the flat spring exerting most of the friction force. Maybe you can cut it from sheet plastic so it will produce less drag. Also you can increase film peeling weight so it will help advance the tape. And when i calculated forces exerted by stepper motors, i got 5 kg of force with nema17 motor and 20-tooth pulley so i think it will be enough. However this may not be the case in chinese-like design with two wheels on one lever.

Here is my reel holder. It's basically the same as alexavr2's but without film peeler (which i will probably make some day). Also i am not sure he uses furniture latches to quick release the axle (but he most probably is).

понедельник, 21 октября 2019 г., 11:08:47 UTC+3 пользователь Mike Menci написал:

[Дмитрий Голик]

I performed first production run! It consisted of only about 300 parts, but it helped me to figure out some things.

https://www.youtube.com/watch?v=ol07YgZOKgs

Good news:

1. It works with both paper and plastic tapes.

2. I did not need to adjust the finger length after it was originally determined.

Bad news:

3. I had drawn the feeders 0.2 mm narrower than the exact feeder pitch trying to compensate my printer's inaccuracy, but it had been printed surprisingly precise, and also the castings happened to be shrunk by another 0.1 - 0.2 mm from the master model, and moreover, my screw template was printed with 12.05 mm pitch instead of 12 mm. So i have about 0.5 mm play in the tape position.

4. One feeder is hard to tune (while others required no tuning at all). It either causes parts to jump sometimes, or it advances the tape with some struggle in case i decrease peeling weight or bend the flat spring towards the bed. I think it is due to polyurethane being not as slippery as desired, and other feeder instances do not suffer from this issue cos release agent residues act as lubricant. So it may be a problem when all the release agent will go.

I think i will try to make a design that does not need the flat spring at all so it won't need much force to advance the tape.

воскресенье, 20 октября 2019 г., 19:33:57 UTC+3 пользователь Дмитрий Голик написал:

[Дмитрий Голик]

https://liteplacer.com/phpBB/viewtopic.php?f=11&t=6272&p=9779#p9779

понедельник, 21 октября 2019 г., 1:04:35 UTC+3 пользователь Tomislav Darlic написал:

This is one of the best ideas I've seen for a feeder. Simple and effective. Because of the stopper part it is probably very precise. 

[mojalovaa1]

Something like this : https://www.youtube.com/watch?v=Lxsvd_DsjN4

[mojalovaa1]

One question , which type of feeder to choose in OpenPnP ?
I use drag feeder and set that not drag tape , but then have  some time who is used for move head , about 1 sec , what is best solution ?

[Дмитрий Голик]

Cool! From what plastic is it made? Are you planning to publish your version?

пятница, 22 ноября 2019 г., 0:59:47 UTC+3 пользователь mojalovaa1 написал:

[Mike M.]

I think AdvancedLoosePartFeeder will do the job...
Mike

[mojalovaa1]

I'm print that with PLA , and work fine , only what can be problem is that need strong stepper on Z axis , but really work grate.
On this moment work on design , need test and see how work on real job , but with time possible that I will share  files.

[Jed Smith]

I've been working on a solution for taking up the tape on this design for awhile now. I'm hoping to have the design files and instructions written up...someday soon...in case anyone else is interested. It is based on the original design in this post.

The idea is to use the stored energy in the depressed spring to not only propel the tape forward, but also provide the energy to pull the cover off. The cover winding spool is over-geared so it will take up any slack that forms. The 'secrete sauce' is a slip connection between its power gear (pictured below) and the spool itself. It requires some trial and error to get exactly the right size parts for just enough friction, but not too much that it binds everything up. I tried a couple of printable designs that allowed tension/friction to be adjusted, but none were really successful or too wide.

So far it has been working well on my manual PnP machine. I haven't tested it yet on my, not yet complete, OpenPnP machine.

[Дмитрий Голик]

Much wow! I had been thinking about film peeling but had not drawn anything. Hanging weights manually is not much fun, so i hope you will publish your brilliant design soon.

Also i see you are using different springs than me. What are they? Why is the flat spring so wide and how does it not overlap with the dog head?

четверг, 30 января 2020 г., 3:48:09 UTC+3 пользователь Jed Smith написал:

[ma...@makr.zone]

Hi Jed

Wow! I've been working on the same thing, based on Dmitri's brilliant design. But with much less success.

I tried a ratchet and even a roller-based free-wheel design, directly propelled by the lever motion. Unsuccessful so far.

Gallery of fails:

Your friction based design, propelled by the tape motion seems to do the trick. Have you tried it with plastic embossed tapes?

Also tried to use printed (PETG) springs to get rid of the extra (metal) parts. This does seem more promising.

Looking forward to seeing your design files.

_Mark

[Jed Smith]

As promised, here is a brief write-up of my design. https://loonatec.com/pnp-semi-automatic-feeder/ Direct link to CAD files: https://bitbucket.org/Loonatec/pnp_semi-automatic_feeder/

Spring choice: it was the first one I found on McMaster that was similar to the couple I had in a spares tube that were working. Haven't had issues with it binding, but I'm sure it could be smaller in diameter.

Gallery of fails: I too had a huge pile of fails that I kept meaning to take a photo of. Fortunately I had to clean off my workbench and they were thrown in the trash before that occurred...

Cover tape: I haven't tried plastic embossed tapes yet. Even with flat/thin plastic cover tapes I'm surprised how quickly the take-up spool starts to fill up. Haven't had to empty one yet, but it is faster than I was hoping for.

I'd welcome any suggestions or improvements to this design, and hopefully the prior designers feel the same way. So far it has greatly improved my manual PnP setup, hoping it helps with the OpenPNP machine I'm still working on.

On Thursday, January 30, 2020 at 7:18:27 AM UTC-5, ma...@makr.zone wrote:

Hi Jed

Wow! I've been working on the same thing, based on Dmitri's brilliant design. But with much less success.

I tried a ratchet and even a roller-based free-wheel design, directly propelled by the lever motion. Unsuccessful so far.

[mojalovaa1]

Nice work

Have you DXF or solid work file for dog ?

[Jed Smith]

No, Дмитрий Голик's design was done in FreeCAD. I imported his STEP into Fusion 360. So no Solid Work file, just step, FreeCAD, and Fusion files.

[ma...@makr.zone]

On Saturday, February 8, 2020 at 8:28:43 PM UTC+1, Jed Smith wrote:

As promised, here is a brief write-up of my design. https://loonatec.com/pnp-semi-automatic-feeder/ Direct link to CAD files: https://bitbucket.org/Loonatec/pnp_semi-automatic_feeder/

Hi Jed

Thanks a lot, this is brilliant.

Thanks to your friction wheel, I made progress with my all-3D-printed ratchet based design. The reason I still go on with mine, is that I need to feed 2mm pitch tapes (0402) which needs only one feed per 2 parts. The nozzle will insert a sideways pin at the correct height and actuate the lever push-pull. If no feed is needed, it will move to the pick location at a lower height. By using push-pull there is also no return spring needed. Will need software changes in OpenPNP, though. The ratchet based design enables using up a cut tape almost to the last part (I hope).

I had to optimze springy parts for 3D printing i.e. against my slicer creating unintended "predetermined breaking points". Where springy parts widen gradually, and the number of side-by-side extrusions jumps up, the slicer creates a "hole" of sorts. Playing around with some Litefeeders printed in PETG, they broke there. I found its better to use a "knotty" design, where constant-width springs flow directly into much wider structures.

It is a fully parametric/programmable OpenSCAD, also supports other tape widths and uses an small, exchangable inset (dark green) for specific embossed pocket sizes and/or paper tape thicknesses. Still needs a lot of tweaking and don't know if it will really work in the end (and how reliably/long term), but I'm more confident now. Basic action works, reel holder, extrusion "snap-in/hanger" mount and nozzle adapter (dark blue) are still work in progress.

Another one for the gallery of (partial) fails, but getting closer:

_Mark

[mojalovaa1]

Have you some video for see it in real work ?

[ma...@makr.zone]

Not yet. Like I wrote it is still work in progress and I'm still changing major things :-/

_Mark

[Javier Hdez.]

@Дмитрий Голик 

Thank you!, I'm going to try it.