Stepper controller and its cooling

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jahn
Posts: 75
Joined: Tue Apr 10, 2012 1:22 pm

Stepper controller and its cooling

Post by jahn » Sat Aug 04, 2012 1:01 pm

What controller do you use and how do you cool it?

I use GRBL shield controller version 3 , using heatsink ( size of that heatsink is app. 3cm x3cm) on each IC driver but it is not enough.
When I run ShapeOko test( downloaded from Shapeoko wiki ), the first letter S is nice, h letter almost nice as well but others not nice.
When the first Shapeoko test is finished, I will run the same ShapeOko test again( with the same GRBL setting) but now
S letter is not good( it is of the bad shape). When I let the GRBL shield cool down and run test again, now S letter is very nice again.
So, temperature is my GRBL shield problem.
Thanks for the advice about cooling

edwardrford
Posts: 1250
Joined: Mon Apr 09, 2012 5:40 pm
Location: Dixon, IL
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Re: Stepper controller and its cooling

Post by edwardrford » Sat Aug 04, 2012 1:34 pm

I'm wondering if it's something in the setup, more so than the shield itself.

What power supply are you using (Volts & Amps)? What type of stepper motors?

I've never had an issue with cooling the grblShield. Even without heatsinks it seems to perform really well for small jobs such as the 'Hello World' Example. Even longer jobs such as the Single Line Drawings I posted about last month do very well.



-edward
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

aldenhart
Posts: 132
Joined: Tue Apr 10, 2012 2:17 pm

Re: Stepper controller and its cooling

Post by aldenhart » Sat Aug 04, 2012 5:09 pm

You may have the stepper current ramped too high. Have you seen this page:
https://www.synthetos.com/wiki/index.ph ... or_Current

vios
Posts: 46
Joined: Sun Apr 22, 2012 12:00 pm

Re: Stepper controller and its cooling

Post by vios » Sat Aug 04, 2012 5:19 pm

Agreed with alden.

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