PRODUCTION RUN - Peter's Head v2 - 10 units

[Peter Betz]

Hi Everyone!

I just posted this on my newest head thread but I figured I'd post here as well as a lot of you aren't subscribed to that thread.

I'm going to do a production run of my newest pick and place head version. I'm actually excited about this as I have wanted to make a batch for some time now. I have tried to make the pricing as good as possible as this is something I would like to continue doing (and I hope it is cheap enough that people who have laser cut versions would want to upgrade to metal) (that makes me think I should have an option for plates only, please indicate if you are interested in this). As I always seem to do, I have likely priced this way to tight, and next run the price will realistically be a little more, so I'd suggest taking advantage of jumping on this run of 10 heads! This will also spur me into continuing my research on Z probing which these heads will have the ability to upgrade to (just by bolting on a few parts that will fit with no mods) if it proves successful.

*****************
Price without our Juki Nozzle holders: $219 USD
*****************
Price with a set of Juki Nozzle holders: $319 USD
*****************

I will discuss a discount for the nozzle holders with Mark when purchased with a head but those are super expensive parts to have made, due to the tolerances, but the results are well worth it!

What you will get:

- One fully assembled V2 head (without the extra hardware for Z probing) complete with NEMA 17 Z axis motor, 2 NEMA 8 hollow shaft part motors, 2 linear rails, genuine micro switch for homing etc. I will even include mounting screws for the X bearing block.
- waterjet from 1/4" ALU to 0.005" tolerance.
- I will be fixturing the waterjet parts and CNC machining the required mating surfaces to have all the parts fit as perpendicular as possible.
- I will also experiment with CNC machining a shallow pocket for the MG9 linear rails. This would create a very accurate reference edge for each rail to ensure the rails are completely parallel to each other and perpendicular to the X axis rail.
* The importance of the above features really become apparent when you start dialing the machine in for smaller parts.
- Fully tested ! I will be performing a variety of tests to ensure that the assembled head meets the quality I would expect if I were purchasing it. This will be especially important with the rails, more on that later.

If you order them with our Juki Nozzle holders, I will also fully test them and set the nozzle holders to the lowest possible runout configuration and ensure runout is within our specified range.

Shipping would be extra but I will have economy and express options. I do not price shipping to make money, so it will be the real cost plus a little for packaging materials etc.

I could also probably do custom backplates for people looking to put this on a machine that doesn't have a 12mm linear rail on the X axis. The kit will not have the 3D printed parts included by default (NEMA 8 vacuum gaskets and the camera mount) but I can look at making those available for those who are interested.

Like I was saying, I'm not sure I will be doing this again for that exact price (assuming there is interest) (I'm a perpetual optimist when it comes to pricing a job :) )but I'm excited about the thought of getting this design out there made of aluminum !!! I'm hoping to get at least 4 people committed before I pull the trigger on spending a couple thousand dollars to make the 10 units.

Pictures attached for effect.

Please indicate if you are interested. Thanks everyone!

Peter Betz
Betz Technik Industries Ltd.
BETZtechnik.ca

[cf]

I am very interested in this. 

[Peter Betz]

Ok, maybe what I will do is create a product page on the website tonight so people can buy them, once we reach the threshold (4?) I can start manufacturing. Fun! 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

On Aug 21, 2017, at 3:52 PM, cf <audi...@gmail.com> wrote:

I am very interested in this. 

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[Peter Betz]

I created a quick product on the website:

Pick and Place head pre-buy

Peter.

[Friedrich Mäckle]

How is the response so far to the offer, do you see a chance that a first batch gets produced?

[Peter Betz]

Hi Friedrich,

It is right on the edge, I will maybe have to look at supplying the plates only. I was hoping for a bet better response so I could stock this stuff and keep evolving it. Will give it a little longer. 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[alexander...@gmail.com]

I suspect the problem is that you've got people that know what they're doing and then you've got the rest of us. I'd like a PNP machine and I'm happy to tinker but I'd much rather start with a complete kit and evolve - the head alone still leaves a lot for the inexperienced builder to contend with.

[Eagle Media]

@Peter I think Alexander is right. For the most people head-only is useless.
It must be a complete and at least partially working solution.

Regards,

Rick

[Eagle Media]

@Alexander I'm working on a kit, but it needs more time for development than I thought.

[Peter Betz]

Interesting points. I guess I'm surprised as it is designed to fit on Anthony's frame design, which is published and has a BOM..... that part is more subjective than the head as to which size rails and extrusions you want to use (what size you want your frame to be). 

I suppose I could look at supplying whole machine kits (frame + head) but the cost would be more significant, and preorder would be mandatory..... not sure how many people would be interested in that. 

My head was also aimed to be a replacement for those who are using the robotdigg head. 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[Gregory Davill]

Having got a laser cut MDF head working, but finding tolerance to be an issue on even "big" parts 0804. The gantry was solid, but the head introduced way too much slop.

Very keen to have a rigid all ALU head on my machine.

[rainharvester]

how thick was the mdf?

[Peter Betz]

Hi Everyone,

We have lift-off. 

I am just finalizing a couple design tweaks and will have the water jetting done and parts ordered.

I am only making 10, and about half are spoken for.

Thanks again!

Peter.

[Friedrich Mäckle]

Dear Peter,

is there any update? I saw that you changed the design a bit. Before you start shipping it would be great if you could get back to me about my order since I may need additional parts (new capacitive sensors, tubes, gear). I do not know if you saw my PM.

Best, Friedrich

[Peter Betz]

Hello Friedrich and everyone else.

Thank you for your patience, I knew I was running out of time! I have all the parts on hand, I am still just sorting out the waterjet cutting. There may be a test cut occurring today. I am trying to dial in the quality (specifically of the gear rack profile. 

You noticed some changes in the design that I wanted to keep on the DL until I was able to test them:

- NEW WATERJET CAMERA MOUNT:

I seem to have a bit of positional drift on the machine from one day to another and I started to suspect my 3D printed camera mount, so now the design has a metal one, you will be able to attach plastic light mounts of my design or your own design this way too. I'm still working on my design. Everyone in the group buy will receive this metal camera mount.

- INDUCTIVE HOMING SENSOR:

I have kept the holes for the microswitch in case anyone objects to the new arrangement, but the head now uses an proximity switch for homing. No wear and tear, incredibly accurate etc. I designed the head plate so you can mount the switch on either side of the head in case it gets in the way.

I just finished testing the switch and confirm it will work at 5v (huge win) and also the repeatability is < 0.002". Here is a video of the testing:

https://youtu.be/tBg-yG6SsD4

Whether you ordered bare plates or the whole assembly you will receive the spur gear and inductive sensor :) 

So that is my update, please have a little more patience as I sort out the waterjet issues.

Peter.

[Gregory Davill]

Hi Peter, thanks for the update!

I really like the inductive sensor. 

I understand that waterjet parts typically have a slight burr on the backside of the cut. Does this interfere with the camera PCB in any way?

Keep it up!

Thanks,

Greg

[Peter Betz]

Hi Greg,

There isn't a burr. There is sometimes a slight taper of the wall but I'm working on that. The only thing about the camera and the pcb is how close one of the caps on the board gets to the metal if the camera is mounted on the bottom of the mount. No issue if you mount it on the top as pictured above.

[Peter Betz]

Hi Everyone,

The parts have finally been cut! They are shipping to me tomorrow so I will post pictures when they arrive. Fingers crossed.

Peter.

[Peter Betz]

Will update later, but here are some pictures :) 

Disregard the engraving, I had some issues.

[Friedrich Mäckle]

Great to hear there is some progress. Can you give us an estimated shipping date?

Best, Friedrich

[Peter Betz]

Hello everyone!

The heads are all done, and packaged for shipping. You should have received an email regarding shipping costs. 

After each set I was adjusting the machining, so only the last 4 or so are actually identical. This is especially true of the engraving, it started fairly ugly and got better towards the end. It is random who got what, so hopefully you do not mind being part of that evolution (obviously has nothing to do with functionality and I kept the ugliest one for myself)! The machining is dialled in now though, the last 4 sets are quite pretty. The base material itself was a bit marked up from handling as you can tell. As I mentioned, genuine HIWIN rails were no longer economically viable, so I ordered some stainless ones from robotdigg that Derek guaranteed to have zero play. I tested all of them and found this to be true (except one bad single rail). I greased the rails with superlube as well.

Couple of observations:

- The nut traps can use some tightening next run.

- The hardware is pretty cheap, I might try local stuff next time.

If you ordered Juki nozzles, I tested and adjusted the runout to be less than 0.0005" TIR on the motors. The actual TIR is marked on the motor with paint pen in 10ths (050 for example for 0.0005").

If you ordered printed camera mount, you now have the included metal camera mount, so I included a couple of printed light panel attaching arms, they didn't print well for some reason. 

If you ordered vacuum adapters, they are in the box with the long attaching screws and also 4mm tube push-to-connect fittings.

I hope you are happy with them, and I am excited to hear your feedback.

Pictures next!!

Peter.

[Peter Betz]

Some pics as promised:

[Jason von Nieda]

Beautiful work Peter! Congrats on bringing this into production!

Jason

On Thu, Oct 19, 2017 at 9:48 PM Peter Betz <betzt...@gmail.com> wrote:

Some pics as promised:

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Peter Betz
Betz Technik Industries Ltd.
BETZtechnik.ca

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[Peter Betz]

On Thursday, October 19, 2017 at 7:49:21 PM UTC-7, Jason von Nieda wrote:

Beautiful work Peter! Congrats on bringing this into production!

Jason

Thanks Jason!!

I suppose I should get back on the feeder train .....

Peter.

[Marek T.]

Hi Peter,
Impressing effect, you can be really proud of your job.
What do you mean about "feeder train"?

[Gregory Davill]

G'Day Peter! 

Everything arrived safely over the pond to AUS. I'm excited to try it out.

I've been reading back through the forums about the changes to smoothie that are required to support homing this head design. (if the switch is active home to min, otherwise home to max). Is this still a change I'll need to make it firmware and build myself? I found Jasons' fork of smoothieware, but I don't think it was ever polished and merged in as a configuration option. 

This head just feels rock solid. Can't wait to get my machine up and running again. (The tinkering is half the fun though)

I noticed that you have tapped holes at each end of the rails as a hard stop. I switched the button-head screws for socket-head, such that they can be fully tightened down and still serve the purpose.

Thanks,

Greg

[Peter Betz]

Hi Greg,

Thanks for the feedback, and I’m glad you are happy with what you received.

I will post the smoothie firmware and maybe my config as well, thanks for pointing that out. 

Yes there are stop screw holes on either side of each rail. Depending on which one you get, I started to only tap the hole part of the way down so that the button head will lock before screwing all the way down. Yours must have been an earlier build that had them tapped all the way through. 

Thanks for the pictures as well! 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[Friedrich Mäckle]

Dear Peter,

just to check back: Did you get my mail about the missing top plate?

Best, Friedrich

Am Montag, 21. August 2017 22:16:52 UTC+2 schrieb Peter Betz:

Hi Everyone!

I just posted this on my newest head thread but I  figured I'd post here as well as a lot of you aren't subscribed to that thread.

I'm going to do a production run of my newest pick and place head version.  I'm actually excited about this as I have wanted to make a batch for some time now. I have tried to make the pricing as good as possible as this is something I would like to continue doing (and I hope it is cheap enough that people who have laser cut versions would want to upgrade to metal) (that makes me think I should have an option for plates only, please indicate if you are interested in this). As I always seem to do, I have likely priced this way to tight, and next run the price will realistically be a little more, so I'd suggest taking advantage of jumping on this run of 10 heads! This will also spur me into continuing my research on Z probing which these heads will have the ability to upgrade to (just by bolting on a few parts that will fit with no mods) if it proves successful.

*****************
Price without our Juki Nozzle holders: $219 USD
*****************
Price with a set of Juki Nozzle holders: $319 USD
*****************

I will discuss a discount for the nozzle holders with Mark when purchased with a head but those are super expensive parts to have made, due to the tolerances, but the results are well worth it!

What you will get:

- One fully assembled V2 head (without the extra hardware for Z probing) complete with NEMA 17 Z axis motor, 2 NEMA 8 hollow shaft part motors, 2 linear rails, genuine micro switch for homing etc. I will even include mounting screws for the X bearing block.
- waterjet from 1/4" ALU to 0.005" tolerance.
- I will be fixturing the waterjet parts and CNC machining the required mating surfaces to have all the parts fit as perpendicular as possible.
- I will also experiment with CNC machining a shallow pocket for the MG9 linear rails. This would create a very accurate reference edge for each rail to ensure the rails are completely parallel  to each other and perpendicular to the X axis rail.
* The importance of the above features really become apparent when you start dialing the machine in for smaller parts.
- Fully tested ! I will be performing a variety of tests to ensure that the assembled head meets the quality I would expect if I were purchasing it. This will be especially important with the rails, more on that later.

If you order them with our Juki Nozzle holders, I will also fully test them and set the nozzle holders to the lowest possible runout configuration and ensure runout is within our specified range.

Shipping would be extra but I will have economy and express options. I do not price shipping to make money, so it will be the real cost plus a little for packaging materials etc.

I could also probably do custom backplates for people looking to put this on a machine that doesn't have a 12mm linear rail on the X axis. The kit will not have the 3D printed parts included by default (NEMA 8 vacuum gaskets and the camera mount) but I can look at making those available for those who are interested.

Like I was saying, I'm not sure I will be doing this again for that exact price (assuming there is interest) (I'm a perpetual optimist when it comes to pricing a job :) )but I'm excited about the thought of getting this design out there made of aluminum !!! I'm hoping to get at least 4 people committed before I pull the trigger on spending a couple thousand dollars to make the 10 units.

Pictures attached for effect.

Please indicate if you are interested. Thanks everyone!

[Peter Betz]

Hi Friedrich,

I emailed you this morning, did you not receive it ? I will send it again. 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[Peter Betz]

One word of caution I don’t think I mentioned. Be careful on the ELP camera mounting. If you mount the camera under the bracket there is a capacitor that comes really really close to touching the metal of the bracket. You will see there is a fillet missing in one of the corners as I tried to mitigate that risk but it is still really close (orient the camera accordingly). If you mount the camera on top of the bracket there are no potential issues. 

Sorry I didn’t mention this sooner ! 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

On Oct 31, 2017, at 6:55 AM, 'Friedrich Mäckle' via OpenPnP <ope...@googlegroups.com> wrote:

--

[Friedrich Mäckle]

I was just building up the head, and I think the motor in the CAD drawing is named NEMA 11, but is actually a Nema 17 one. 

To be honest, I think it doesnt make much sense to sell only the plates (haha I bought that), because there are so many screws and stuff that it would be best to sell only full kits. I did not go for the full kit because I already had rails and a motor, but looking back I should have gotten it.

But besides that I think the head is a great addition to the OpenPnP ecosystem. I also would need the config files at some point.

[Peter Betz]

Hi Friedrich,

You are correct about the motor size. I should change the label. 

I agree about the plates only kits, I was just trying to give everyone options and not put anyone in a box. You were the only one to pick plates only though. Haha. 

(I will have that shipping quote to you shortly by the way, sorry for the delay, making an anniversary gift for my wife on the lathe and it has been taking up all my time!!) 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[Friedrich Mäckle]

So as my Head is now almost complete, I am looking forward to start up my machine.

I don't know how to configure the shared Axis on the head and the sensor, so it would be great if you could share the configuration files (smoothie) or maybe a Wiki article on how to setup the head.

Best, Friedrich

[Peter Betz]

Hi Friedrich,

I updated the product page with my example config and link to the openpnp fork of smoothie.

[Peter Betz]

Hello again all,

I was just experimenting with the inductive homing on the machine and made a discovery that I was not expecting. the 5v pins on the mks sbase are not actually 5v, they are slightly less. I tested the sensor at 5v and it works, but it does not work at the voltage that the mks sbase has on that rail. I will look for a true 5v source we can tap into. 

Anyone with a genuine smoothie able to test the V+ pin for the end stop connections? I have been wanting to buy a genuine smoothie to properly support the cause anyways.

Also, the smoothie firmware needs to be adjusted, I am discussing with Jason. The directions need to be reversed. I will let you know when the code is changed.

Thanks everyone!

Peter.

[Peter Betz]

I found good enough 5v on the other side of this fuse (F4). I’m assuming this is coming from the usb cable (computer powered) but it seems to be fine to use it for now:

[SMdude]

Hi Peter,

Why do you say that the smoothie firmware needs to be adjusted? I have been using the modified smoothie firmware on a head with similar operating principle to yours(belt drive instead of gear) for ages now and it behaves as I would expect.

Can you get away with reversing your Z motor instead?

Mick

[Peter Betz]

Hi Mick,

The homing routine first checks whether or not the Z homing switch is tripped before deciding which way to move. This ensures whichever nozzle is lower will move up to avoid a collision with what might be below. The switch is active the entire time it is on one side of centre for this purpose. The only way to accomplish this is with custom firmware. 

Peter.

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[Gregory Davill]

Peter, 

It sounds like Mick is using the "moddified" style firmware. 

You are saying the "moddified" firmware needs to be adjusted to change direction. Can you not simply invert the endstop signal in your config? Wouldn't this have the same effect?

-Greg

[Peter Betz]

Hi Greg,

I’m assuming he isn’t using the modified firmware and possibly has one homing switch at the end of one of the Z rails. (That’s not how my head works). 

The firmware is what tells it what direction to go in order to move towards the switch. If the right rail is above the switch it will start moving down, and if it is below the switch it will start moving up. I’d have to try and wrap my head around what would happen if I simply inverted the switch signal, I have to say I hadn’t considered it an option, may be a simple solution. Stand by for more info. 

Thanks everyone. 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[SMdude]

Hi Peter,

That is exactly how mine works too.
When my heads are centred(z=0)  the optical switch is right at the tripping point.
When N1 goes down(-z values) the switch is open.
When N2 goes down, the switch is closed for the entire time until the nozzles are centred again.

I am using the fork of smoothie  that Jason modified ages ago.
If you need to invert the way it works just put a ! in front (or is it behind??) where you declare which pin is the input for the endstop.

Mick

[Peter Betz]

Hi Mick,

Ah yes, your using the original opto system. I will try playing with the config but the firmware as written (the one that works with the opto system you describe) is backwards for the inductive sensor. I will see if reversing the flag in the config counteracts that. 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[Peter Betz]

Success!!

Thanks for the suggestion about reversing the flag, it made the difference. I wasn't sure if after the smoothie firmware changes it still pulled homing information from the config still but it obviously does.

I updated the website with the new config, smoothie firmware link and quick video showing the homing with the new sensor. 

http://www.betztechnik.ca/store/p34/Pick_and_Place_head_-_dual_nozzle_-_OpenPnP_compatible.html

Have a good night everyone,

Peter.

[Tracker J]

Hi Peter,

Is your head mount backplate compatible with the MGN12H or C linear block?

Also, it will be possbile to have also a 15mm version, for MGN15H or MGN15C?

Thank you,
TJ.

[betzt...@gmail.com]

Hi TJ,

 

The head is currently 20mm x 20mm hole spacing so that it MGN12H (long block). I threw an MGN15C into the model to see how things would line up, and I think it would be fine. You would align the top row of holes (to keep your distance from the NEMA17 motor) and then you would need an extra 2 holes below the existing two  for the MGN12 (they are clearance drill size during waterjet so they are already there on the plates). The spacing seems fine, so I don’t think it would affect the rigidity of the main plate:

 

 

 

I just got a new batch of waterjet parts that I will be fixturing and machining. If you wanted a head, and modified with the extra set of holes for MGN15C, let me know and I can do that for you.

 

Peter.

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[Marek T.]

Hi Peter,

Peter, could you pls to let me know what kind of endswitches you use in your head? I know from Jason that you have used some inductive type and you're glad of their precission.
I have some inductive endswitches in my machine and have suspection that they are not so ideal as I thought - it seems that I have some problems with their repeatibility and proper homing.
The pdf of my switches says about repeatibility parameter 0.04mm. Are your switches better about this (in theory at least?).

br
Marek

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[Robert Waters]

Peter, I'm using the THK SRS12MUU+470LM rails with 15mm spacing on my machine. Will they work?

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[Peter Betz]

Hello Robert,

 

I did a quick sketch on the head plate sitting in the fixture. It looks like your mounting screws are 20mm tall spacing, and 15mm wide spacing. Seems ok to me, exact same scenario as the 15mm rails, just rotated 90 degrees.

 

 

The rail would be off center a bit but that will make no difference.

 

Again, if you want to buy a head I can add these holes as long as you order before I machine them all, I will probably be milling them on Thursday. Just doing the new fixture tool paths right now.

 

 

 

Thanks!

 

Peter Betz
Betz Technik Industries Ltd.

 

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[Peter Betz]

On Sunday, November 19, 2017 at 12:24:35 PM UTC-8, Marek T. wrote:

Hi Peter,

Peter, could you pls to let me know what kind of endswitches you use in your head? I know from Jason that you have used some inductive type and you're glad of their precission.
I have some inductive endswitches in my machine and have suspection that they are not so ideal as I thought - it seems that I have some problems with their repeatibility and proper homing.
The pdf of my switches says about repeatibility parameter 0.04mm. Are your switches better about this (in theory at least?).

br
Marek

Hi Marek,

 Sorry for the delay. I am using robotdigg 8mm inductive switches. I am happy with them so far, especially since I am using them under their rated voltage. The head homing isn't critical because of the spring loaded nozzles but my [crude] test on the mill showed repeat-ability of >0.002" (0.05mm) at 5v. I took a video of the test here.

Peter.

[Marek T.]

Hi Peter,
No problem with delay, it was a late night here :-).
Thx a lot for this info and movie test, it's very valuable for me.
0.05 for z of the head is really great accuracy but for xy homing is a tragedy.
My sensors are Panasonic rated 24Vdc and seems be the same about their repeatability, I observe it looking on some xy point finding after homing which find in +/- 0.03mm different places :-(. So it seems to be a common result of this type sensors.

br
Marek

[SMdude]

Marek, I think it is a good idea to implement visual homing ;)

It is possible that the original controller in your machin(and other commercial big name machines) compensated for drift with temperature change.

[Robert Waters]

Hi Peter,

I put my order in last week. I'm the guy who forgot to order the Nozzle Holders originally. 

Thanks,

Bob Waters

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[Marek T.]

Mick let's get out of here and make no mess in Peter's great project thread.
My unswear in your thread about endswitches.

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[Peter Betz]

It’s all related, I don’t really mind.

In fact I think I will change the head design to allow for both addition mounting patterns discussed here for flexibility. I don’t think there would be a meaningful effect on structural integrity.

Peter Betz
Betz Technik Industries Ltd.

BETZtechnik.ca

[Peter Betz]

While I had the head plated on the mill I also added the two hole patterns discussed here. So the head supports the following patterns ("wide = X" and "high" = Z):

20mm wide x 20mm high

15mm wide x 20mm high

20mm wide x 25mm high

There is a drawing on the product page. 

I have also finally dialled in the engraving (so beware, there is likely a Canadian flag showing up on the head soon!):

I think that is all the news I have for you!

Peter.

[Tracker J]

It's looking very nice Peter, with all that available options by default!

Another good quality linear guideways I have used over time with very good results and stability in time are the ones from HIWIN (original ones) - HGL15CA:
https://www.hiwin.de/en/Products/Linear_Guideways/Series_HG_QH/Block_HG/HGL/4276/22134

Unfortunately they look a bit bigger to be able to accomodate.

Cheers,
TJ.

[Robert Waters]

Just received my head and it is a work of art. Any plans to make/sell some other parts like perhaps a rack for the Nozzles, Motor Brackets etc?

On Monday, August 21, 2017 at 3:16:52 PM UTC-5, Peter Betz wrote:

Hi Everyone!

I just posted this on my newest head thread but I  figured I'd post here as well as a lot of you aren't subscribed to that thread.

I'm going to do a production run of my newest pick and place head version.  I'm actually excited about this as I have wanted to make a batch for some time now. I have tried to make the pricing as good as possible as this is something I would like to continue doing (and I hope it is cheap enough that people who have laser cut versions would want to upgrade to metal) (that makes me think I should have an option for plates only, please indicate if you are interested in this). As I always seem to do, I have likely priced this way to tight, and next run the price will realistically be a little more, so I'd suggest taking advantage of jumping on this run of 10 heads! This will also spur me into continuing my research on Z probing which these heads will have the ability to upgrade to (just by bolting on a few parts that will fit with no mods) if it proves successful.

*****************
Price without our Juki Nozzle holders: $219 USD
*****************
Price with a set of Juki Nozzle holders: $319 USD
*****************

I will discuss a discount for the nozzle holders with Mark when purchased with a head but those are super expensive parts to have made, due to the tolerances, but the results are well worth it!

What you will get:

- One fully assembled V2 head (without the extra hardware for Z probing) complete with NEMA 17 Z axis motor, 2 NEMA 8 hollow shaft part motors, 2 linear rails, genuine micro switch for homing etc. I will even include mounting screws for the X bearing block.
- waterjet from 1/4" ALU to 0.005" tolerance.
- I will be fixturing the waterjet parts and CNC machining the required mating surfaces to have all the parts fit as perpendicular as possible.
- I will also experiment with CNC machining a shallow pocket for the MG9 linear rails. This would create a very accurate reference edge for each rail to ensure the rails are completely parallel  to each other and perpendicular to the X axis rail.
* The importance of the above features really become apparent when you start dialing the machine in for smaller parts.
- Fully tested ! I will be performing a variety of tests to ensure that the assembled head meets the quality I would expect if I were purchasing it. This will be especially important with the rails, more on that later.

If you order them with our Juki Nozzle holders, I will also fully test them and set the nozzle holders to the lowest possible runout configuration and ensure runout is within our specified range.

Shipping would be extra but I will have economy and express options. I do not price shipping to make money, so it will be the real cost plus a little for packaging materials etc.

I could also probably do custom backplates for people looking to put this on a machine that doesn't have a 12mm linear rail on the X axis. The kit will not have the 3D printed parts included by default (NEMA 8 vacuum gaskets and the camera mount) but I can look at making those available for those who are interested.

Like I was saying, I'm not sure I will be doing this again for that exact price (assuming there is interest) (I'm a perpetual optimist when it comes to pricing a job :) )but I'm excited about the thought of getting this design out there made of aluminum !!! I'm hoping to get at least 4 people committed before I pull the trigger on spending a couple thousand dollars to make the 10 units.

Pictures attached for effect.

Please indicate if you are interested. Thanks everyone!

Peter Betz

[Friedrich Mäckle]

Very slowly I am moving forward, so the head is now attached to the machine and the endstop seems to work.

Regarding the smoothie config: It might be helpful to highlight the important part. Since it is not the default smoothie file it would be great if there was some kind of comment in the file, so one knows where to look at.

[Peter Betz]

On Thursday, November 30, 2017 at 5:54:15 AM UTC-8, Robert Waters wrote:

Just received my head and it is a work of art. Any plans to make/sell some other parts like perhaps a rack for the Nozzles, Motor Brackets etc?

Hi Robert,

 I am glad to hear you are happy with the head, thanks for your feedback.

I am thinking about that actually. All of this takes significant amounts of money though. Each time I commit to making a batch of just 10 heads I have to fork out thousands of dollars. It would be even more so with machine kits/ parts. I am trying to use this money to further invest in openpnp related hardware. Right now that is automatic feeders. I just had a set of stainless steel feeder gears cut with a laser for testing. That stuff isn't cheap! I hope to get somewhere with them shortly and then I would like to design a new machine kit that uses ball screws and closed loop steppers or servos in the new year (if and when I have the cash to do that). I could certainly add Anthony's frame design brackets to the parts I have water jet and then machine the required features on the mill, just not sure what the interest is like.

Thanks again,

Peter.

[Peter Betz]

On Thursday, November 30, 2017 at 9:23:21 AM UTC-8, Friedrich Mäckle wrote:

Very slowly I am moving forward, so the head is now attached to the machine and the endstop seems to work.

Regarding the smoothie config: It might be helpful to highlight the important part. Since it is not the default smoothie file it would be great if there was some kind of comment in the file, so one knows where to look at.

 Hi Friedrich,

Glad you are making progress! What part of the config are you curious about? One of the things I should make more clear is the machine XML file. There is a homing sequence in there (see my example machine file). When the switch trips, it is not likely to be at a point where the two nozzles are level, so the homing routine in the machine file tweaks it for your machine.

         <command type="HOME_COMMAND">

            <text><![CDATA[G92.1]]></text>

            <text><![CDATA[             G28 Z]]></text>

            <text><![CDATA[             G01 Z-1.7]]></text>

            <text><![CDATA[             G92 Z0]]></text>

            <text><![CDATA[             G28 X]]></text>

            <text><![CDATA[             G28 Y]]></text>

            <text><![CDATA[             G92 X0 Y0]]></text>

         </command>

So the routine in my example file tells Z to home, then move -1.7mm (because on my machine that is how I had to move it to have the nozzles level) then G92 sets that new Z position to be the new Z 0. So on your machine you just need to run it, and see how you need to move it to level it, then adjust that line in the XML. 

I hope this makes sense!

Peter.

[Robert Waters]

Yes, I do appreciate the $ and time that goes into it and a pretty small group of potential buyers. After frying a stepper on my Y axis, I have decided to try one of the Clearpath servos. I am a neophyte in the motion control world but I can see some big advantages with going towards ball screws and better motors. I am also seeing that it probably would have been cheaper to go with a Neoden 4 by the time I get done. Since I seem to be constantly rethinking things as I go, having my 3d printer spitting out PA-CF parts is a better plan until I get things working enough to commit to metal parts. I have recently signed up at the local Maker Space and they are pretty well equipped with small CNC and a Bridgeport etc. Lots of helpful guys around that are very interested in the project and willing to help me out. 

Concentrating on a feeder design would make allot of sense. Higher volume of parts and potential buyers.

[Anthony Webb]

Robert, good call on the clearpaths! I have used them extensively in project and promise you they are awesome!  The only other one I am keen to try is the odrive setup. Please keep us posted as you start your build!

Sent from my iPhone

On Nov 30, 2017, at 11:31 PM, Robert Waters <rbrt...@gmail.com> wrote:

Yes, I do appreciate the $ and time that goes into it and a pretty small group of potential buyers. After frying a stepper on my Y axis, I have decided to try one of the Clearpath servos. I am a neophyte in the motion control world but I can see some big advantages with going towards ball screws and better motors. I am also seeing that it probably would have been cheaper to go with a Neoden 4 by the time I get done. Since I seem to be constantly rethinking things as I go, having my 3d printer spitting out PA-CF parts is a better plan until I get things working enough to commit to metal parts. I have recently signed up at the local Maker Space and they are pretty well equipped with small CNC and a Bridgeport etc. Lots of helpful guys around that are very interested in the project and willing to help me out. 

Concentrating on a feeder design would make allot of sense. Higher volume of parts and potential buyers.

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[Friedrich Mäckle]

Hi Peter,

this is also interesting, but I was after the smoothie config. Only like the pin configuration and homing stuff. You linked an example config on your website, but as it is the whole config I do not know where to look at.

Best, Friedrich

[Michael Anton]

Have you considered designing your feeders around off the shelf gears?  If you can get away with nylon gears, these can be had very inexpensively on AliExpress, and on other Chinese sites.  That's what I was using in the feeder design I was working on, and I suspect they would work fairly well.  I did have a sprocket gear laser cut, which looks like it should work very well, but that isn't an easy part to find inexpensively off the shelf, so we're kind of stuck there.

The worm gears that are available, even mate with the standard spur gears, though there is a bit of slop, since the angles are wrong, but I think that combination would work fine for a feeder design.  I was looking at something like this 44 tooth gear to drive the sprocket, as it has holes in it so it could be fastened to the sprocket assembly using screws, and this worm gear to drive the sprocket gear.  I have both of these on hand, and they look like they will mate well enough to drive the sprocket.  I just put the worm on a 2mm shaft, which is driven using another pair of gears from an N20 gear head motor.  See the attached 3D pdf to get some idea of where I was headed.

[Michael Anton]

Also on the gear front, here is a 12 tooth gear for an N20 motor, and a matching 12 tooth spur gear for on a 2mm shaft.

[Marius Liebenberg]

I am looking at putting a double head on my machine. The thing that I dont get is how to setup and drive two Z axis with one stepper. Is there a sample config for this kind of double head configuration for the Smoothie that I can have a look at please?

[Peter Betz]

I have a sample smoothie config on the product page for my head. 

Peter Betz

Betz Technik Industries Ltd. 

BETZtechnik.ca

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[Robert Waters]

You should also look at this page https://github.com/openpnp/openpnp/wiki/GcodeDriver%3A-Axis-Mapping

[Tracker J]

Hi Peter,

Finally found some free time to play a bit with the new Head received from you.

It's replacing an old head, same configuration, dual head, etc, just the Z-limit sensor was different.

I have used your example code for reset and still don't get it to proper reset:
G92.1
    G28 Z
    G01 Z+30
    G92 Z0
    G28 X
    G28 Y
    G92 X250 Y340

Also as soon as the new head capacitive Z sensor is no more covered, head going down under it, it's tripping the limit max_z switch:

2018-01-25 16:09:36 GcodeDriver DEBUG: sendCommand(COM53 G28 X, -1) => [Limit switch max_z was hit - reset or M999 required, ok]


Can you help a bit with a detailed configuration to adapt your head on my PNP please.

Thank you,
TJ.

[Peter Betz]

Hi TJ,

 

Glad you are getting a chance to play with it!

 

1. Have you installed the required smoothie firmware to run my style of homing?
2. Sounds like you have a Z limit enabled in the smoothie config. This homing sensor cannot be used as a limit switch, only a homing switch.
3. Make sure you have true 5v going to the homing sensor (sounds like it is functioning though so not likely an issue).
4. It seems like you are commanding Nozzle 1 to go up 30mm during homing with “G01 Z+30”. What is the reason for this? This line levels the two nozzles. When they home they probably aren’t completely level because the switch will not likely be in the exact right position. You home the machine fist without this G01 Z move, then use the DRO in openpnp to move the nozzles so they are level, the number you see in the DRO then gets put into the homing code so it levels them automatically.

 

G28 Z           // home Z. The nozzles will not be perfectly level after this process

G01 Z1.7     // Leave this command out when you are setting up the machine for the first time. It moves Z to level the nozzles. You can obtain this value by homing and then measuring how far to move nozzle one to make the nozzles sit level. You can use the openpnp DRO to measure.

G92 Z0        // Zero Z machine coordinates now that the nozzles are sitting level.

G28 X          // Home X

G28 Y          // Home Y

G92 X0 Y0  // Zero X and Y machine coordinates

 

Hope this helps!

 

Peter Betz
Betz Technik Industries Ltd.

 

From: Tracker J
Sent: January 25, 2018 6:15 AM
To: OpenPnP
Subject: Re: [OpenPnP] Re: PRODUCTION RUN - Peter's Head v2 - 10 units

 

Hi Peter,

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/2fb73bd1-01a8-4638-8b4f-dd5dbbb6e86d%40googlegroups.com.

[Tracker J]

Hi Peter,

Yep, I stil need few bits and pieces but will come nice together I think. The previuos configuration was working OK, so I'm sure that with your valuable help will done it.

1. I didn't notice that I need to have a special smoothie firmware version. I am using a MKS Base board, where I can find a suitable firmware for it?
2. yes, Z limit was enabled, understood now that in this configuration is no limit switch function on Z ax.
3. I have proper 5Vcc for it from the separate PNP PSU board, so it's working OK.
4. The +30 was just a test to see what's happening if/when the homing button is used in OpenPNP.

I will continue playing with, just to beter understand how it works and meanwhile if you can provide a link for the right firmware version will go further with this configuration. Otherelse with the stock firmware probably I will be forced to move the Z switch somewhere up and use it as a homing/limit switch as I have done before with the previous optical one.

Thank you,
TJ.

[Peter Betz]

Firmware link is on the product page.

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/61554db8-b645-4baf-aac7-2157fad3e960%40googlegroups.com.

[Tracker J]

Thanks Peter, I have somehow missed that link.

Has anybody compiled a newer version of it as the existing .bin seems to be based on a old version of smoothie code (Jun 17, 2016) :
https://github.com/openpnp/Smoothieware/tree/edge/FirmwareBin

Meanwhile I will reposition the Z sensor and give it a try with stock firmware.

Happy breadboarding,
TJ.

[Friedrich Mäckle]

Hey,

I still have not used my sensor yet because I wanted to compile a newer version of Smoothie.

Has anyone ported the shared C homing to Smoothieware yet? Or maybe it is available from stock by the time?

Otherwise I might start doing it at some point later this year when I solved the other open issues on my machine.

Best, Friedrich