Automatic Nozzle Changing Station Designs

[Maple_Dude]

 I was wondering if anyone had a basic nozzle holder/changer design that works they minded sharing or directing me to? (for Juki Nozzles)

thanks

[Sol Huebner]

I have not tried it, but maybe have a look at https://github.com/geniekobayashi/juki_nozzle_changer

[Peter Betz]

I am in the process of building a new [fully parametric]  PnP machine. Nozzle changing will be near the top of my list for projects once I have it built. I am worried about the torque of the NEMA17 but we will find out soon enough. 

[Mike M.]

@ Peter

To mesure force needed you could try with your head (& no nozzle) to press down on Kitchen scale and see what force is needed to compress the spring if Nema 17 can handle that?

My exsample with screw driven Z is here; https://groups.google.com/d/msg/openpnp/WAHFWVwHtjU/0tp0dqT9AQAJ

Mike

[Peter Betz]

Yes I intend to do just that. I also just ordered some 0.8mm diameter springs for the nozzle holders to test if it can work well with a little less pressure on the collar. 

[Maple_Dude]

@ Betz, I am not sure what you are refering to. 

After doing some looking, I see a few sample designs online: 

https://www.thingiverse.com/thing:3527421

https://www.thingiverse.com/thing:3907209

https://youtu.be/Ctjf5pvbIKI?t=131

Of course Mike Your designs are always awesome. I am curious though, the magnets used to help keep the nozzle in place, etc, does that risk magnetizing the Juki Nozzles? Is that actually a concern, or is that a nonconcern? 

[Peter Betz]

On Thursday, June 4, 2020 at 12:33:38 PM UTC-7, Maple_Dude wrote:

@ Betz, I am not sure what you are refering to. 

My main concern is the amount of force required (Z stepper) to compress the spring on the juki nozzle holder (The ones I sell). So I am ordering smaller diameter springs to try out in the holders to see if I can reduce the amount of force required to release the nozzle. They normally have 1mm diameter wire, I ordered some 0.8mm ones to try. 

[Maple_Dude]

Oh gotcha

[Maple_Dude]

@Betz Dumb question for you, I know where I can buy packs of springs. I know where i can buy random assortments of springs. But where would I go to buy a spring of a particular size / shape? Like for instance, the 0.8mm springs you mentioned? (if you feel comfortable sharing)

On Thursday, June 4, 2020 at 1:46:55 PM UTC-6, Peter Betz wrote:

[Peter Betz]

I don't keep anything to myself, all of my designs are open source, happy to help anyone make their own for their own use! I get all of the nozzle parts from mcmaster carr, except those spot springs, which I get from Aliexpress. 

[Mike M.]

Peter you might test my solution with two seals - O-rings on Juki  - I use Darts O rings from China - ( there are some here; https://www.ebay.de/itm/O-Ringe-6-mm-Kleingewinde-2ba-Gummi-Ringe-fur-Alu-Schaft/312168227755?hash=item48aead23ab:m:mJBTtCfApZyiR-e296uYUyw )

No spring will be needed. It has enough friction to keep the nozzle in 7mm H7 head hole and easyer to slide in & out. I use a bit of Silicone lubricant on seals as well.

See picture enclosed with Cleaning tooth pins for nozzle cleaning

Mike

[Mike M.]

@Dude - magnets used to help keep the nozzle in place in nozzle changer == years beck - not anymore!

Mike

[Mike M.]

Here is my servo nozzle changer ;

Easy to configure with Smoothie Config. file for servo - but I am not a coding guy to make it working with Open PnP

Advantage is for Heads with two nozzles -2nd nozzle would not colide with changer..

STL in enclosure

[Peter Betz]

Hi Mike,

I have been considering modifying the nozzle holder design to still use the M2 balls but have an elastomeric component on the outside of the shaft squeezing them in. Might try that when I get the new batch in.

Peter.

[Mike M.]

Hello Peter,

Do you have this kind of "elastometric" sleeve in mind:

https://www.aliexpress.com/item/32492522139.html?spm=a2g0o.productlist.0.0.c964857a9E0YH7&s=p&ad_pvid=202006051057085149347613508640006516413_2&algo_pvid=67aab95a-1ec3-4566-beb3-5a97cfad6801&algo_expid=67aab95a-1ec3-4566-beb3-5a97cfad6801-1&btsid=0be3764315913798282414359ec531&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

Mike

[RENEE Berty]

Pretty awesome 💪🏾👍🏾

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[Betz Technik Industries Ltd.]

Hi Mike,

 

Yes that is the kind of thing I’m thinking about. Would make them cheaper too with only one part to machine on the Swiss lathe.

 

Peter.

[Jan R]

Hi Peter,

How about this solution.

Jan

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[Betz Technik Industries Ltd.]

Yes that is more exactly what I was thinking. Except pretty, and accurate, haha.

 

Sent from Mail for Windows 10

 

From: Jan R
Sent: June 5, 2020 1:34 PM
To: OpenPnP
Subject: Re: [OpenPnP] Re: Automatic Nozzle Changing Station Designs

 

Hi Peter,

 

How about this solution.

 

Jan

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[Shai]

@Mike

That servo nozzle changer is a great solution. I think you posted it before somewhere? Does it work?

[Iceturf]

I'm a bit unclear - why would the nozzle collide? 

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[John Plocher]

Why would it collide?

Think of a linear bank of Replacement tips - how do you change only one tip on a multi nozzle head without the other nozzles crashing into the other tips in the tip bank?

 John

[Mike M.]

Problem is with Juki nozzles becouse they are very large in hight and not with Samsung (on Samsung tip is changed and it is small in size compared withJuki)

See this video here and emagine you have 2 nozzles: https://www.youtube.com/watch?v=KRR3bC9j_3s&app=desktop

I posted this servo changer here:  https://groups.google.com/forum/#!msg/openpnp/G1eKJN4OJN8/_vrlIJNhBAAJ

Mike

[Shai]

I think collision depends on how far down your nozzles travel. If it travels down far enough, then there won't be any collision. I'd be more curious how resistant that one screw assembly to the motor would be to withstand any forces applied to it from pushing nozzles in and down.

[Mike M.]

Hi Shai,

You are right - 2nd nozzle would need to be high enough when you change the 1st nozzle -  (Juki nozzle is 24mm high + some gap). Most of PnP do not have this Z movement...

For driving into servo you do not need to go all the way to press in the nozzle - the Clip will take it to final position. A bit force on sevo is needed when you go press the nozzle into thze head and when you go out ....

Mike