DIY DTG - Build your own Digital T-Shirt Printer

 
User avatar
Andy
Site Admin
Posts: 1433
Joined: Mon Jul 25, 2016 5:59 pm

Re: OpenDTG Pre-Treater Build

Fri Mar 17, 2017 10:22 am

ddelgrande wrote:
So I have everything I need to build the pre-treater, so a few more questions: 

1.  I'm building the base out of OpenBuilds V-Slot Gantry Set and V-Slot Linear Rail coupled to 1 1/2" PVC Schedule 40 pipe.  I will T the pipe to build the riser extensions but wonder where I should place those extensions in relation to the the V-Slot which is 39" long.  I'll be using/making a platen that is 18" wide and 24" long.

2.  The Start and Purge buttons.  Does the polarity matter when connecting to the Pre-treater board?

3.  bStop = Limit Switch?

4. Length and Speed buttons.  With the buttons facing with the terminals up, from left to right, would that be minus, ground, plus?

Thanks, 

1: I put the nozzle towards the front of where the Epson printer would be if this was a printer base.
2: Polarity doesn't matter on those
3: This is the back stop limit switch
4: I will look and upload something soon but you just want to keep them in order. 5v - Signal - Gnd. If you keep them in a order the worst case is they are backwards and your knob operates opposite.

Sorry for the lack of documentation. I'm working on more documents and videos 
 
ddelgrande
Contributor
Topic Author
Posts: 176
Joined: Sat Aug 13, 2016 8:40 am

Re: OpenDTG Pre-Treater Build

Tue Apr 25, 2017 6:33 pm

IMG_1754.JPG


Need verification if I had the pins labeled correctly.  I think I may have the 5V and GND reversed. 

Thanks
You do not have the required permissions to view the files attached to this post.
 
User avatar
Andy
Site Admin
Posts: 1433
Joined: Mon Jul 25, 2016 5:59 pm

Re: OpenDTG Pre-Treater Build

Tue Apr 25, 2017 6:41 pm

I have the 5v and GND opposite in my notes. Worst case your knob works backwards and you then flip the wires.
 
ddelgrande
Contributor
Topic Author
Posts: 176
Joined: Sat Aug 13, 2016 8:40 am

Re: OpenDTG Pre-Treater Build

Tue Apr 25, 2017 6:47 pm

Yeah, I thought I had it backward.  I looked at the diagram for the potentiometer but could make heads or tails of it!

Thanks 
 
ddelgrande
Contributor
Topic Author
Posts: 176
Joined: Sat Aug 13, 2016 8:40 am

Re: OpenDTG Pre-Treater Build

Mon Jun 26, 2017 11:10 am

OK, so I got my pretreater up and running on the first try now I just need to tweak a few things!

First off, priming the pump is a bit of a pain and I'm wondering what is the best way that will not use a lot of pretreat solution.   I'm just using water at this point to dial things in but would like to know the best placement of the gallon jug of pretreat with respect to the pump—how short can I make the tube run from the gallon to the pump.  Should the gallon be at the same height as the pump, or higher, lower or does it matter?

Right now with the speed and length knob set to their highest levels, the spray will cover about 12".  How can I make that longer?  I'm looking for a length of 18".

FYI, this is a really easy build compared to converting a P600.  If you've gone through that labyrinth of "gotchas" building/converting a P600, building a pretreat machine with the OpentDTG kit is a piece of cake!

Thanks
 
User avatar
Andy
Site Admin
Posts: 1433
Joined: Mon Jul 25, 2016 5:59 pm

Re: OpenDTG Pre-Treater Build

Mon Jun 26, 2017 11:45 am

ddelgrande wrote:
OK, so I got my pretreater up and running on the first try now I just need to tweak a few things!

First off, priming the pump is a bit of a pain and I'm wondering what is the best way that will not use a lot of pretreat solution.   I'm just using water at this point to dial things in but would like to know the best placement of the gallon jug of pretreat with respect to the pump—how short can I make the tube run from the gallon to the pump.  Should the gallon be at the same height as the pump, or higher, lower or does it matter?

Right now with the speed and length knob set to their highest levels, the spray will cover about 12".  How can I make that longer?  I'm looking for a length of 18".

FYI, this is a really easy build compared to converting a P600.  If you've gone through that labyrinth of "gotchas" building/converting a P600, building a pretreat machine with the OpentDTG kit is a piece of cake!

Thanks

Haha yeah the pretreater is a whole different level. 
Code line 215 you can change the maximum length by changing the 6400 step number
There are some side effects of going too short between the pump and the nozzle so keep the pump at least a couple feet away.  To prime remove the nozzle and hold the purge button, this should pump the air out.  Height of the pretreat gallon shouldn't matter too much.
 
ddelgrande
Contributor
Topic Author
Posts: 176
Joined: Sat Aug 13, 2016 8:40 am

Re: OpenDTG Pre-Treater Build

Mon Jun 26, 2017 2:42 pm

On code line 215 I upped the step from 6400 to 11400 which gave me 18" of spray length.  Now I just need to lower the height of my spray nozzle.  It's currently at 8 1/2 above the platen and is spraying beyond each side of the platen by a couple of inches.  The platen is 18" wide so the spray is currently 22" (or thereabouts) wide.  

I going to reduce down to 7 1/2" and see how that works.  It's PVC so easily done. 

What I am going to build to keep the spray from going all over is an enclosure.  Should be easy enough to do build a frame out of PVC, but not sure what type of sheets to use for the sides/front/top.
 
ddelgrande
Contributor
Topic Author
Posts: 176
Joined: Sat Aug 13, 2016 8:40 am

Re: OpenDTG Pre-Treater Build

Tue Jun 27, 2017 10:06 am

I adjusted the spray height to 7 1/2" from 8 /2" and that seems to be the perfect height for an 18" wide platen.  
Now on to building the spray enclosure. 
 
iuliusdobre
Contributor
Posts: 28
Joined: Sat Apr 08, 2017 2:55 am

Re: OpenDTG Pre-Treater Build

Tue Jun 27, 2017 11:59 pm

Please, can you post a video or some images?

Who is online

Users browsing this forum: No registered users and 2 guests