Search found 71 matches

by groguard
Wed Nov 12, 2014 3:39 am
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

Is it still hot? That's all that matters. If it's still hot, you need to arrange your fan differently, put another fan on it or adjust your current. The whole goal is to get it cool to the touch, your problems won't end until that happens. So, is it hot and is your fan blowing air directly onto the...
by groguard
Wed Nov 12, 2014 2:31 am
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

If it's still uncomfortably hot to the touch, it's going to go into thermal shutdown. Put a fan on it and cool it-- if it's still cool and you're having issues, then it is time to worry. For now, just figure out how to cool it. I have a fan on it, but no heatsinks. There is a video in this post sho...
by groguard
Wed Nov 12, 2014 2:25 am
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

Well you just said part of it. YOU Adjusted the Current and have not had an issue since. SO not far off. Very true and-- as per general experience, a number of posts on this forum, and the wiki -- adjusting/tuning the current trim pots should be a standard part of your setup. Excessive heat is a co...
by groguard
Wed Nov 12, 2014 2:15 am
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

I also turned the pot down to the 12 o clock position and still had the same problem.
by groguard
Wed Nov 12, 2014 2:13 am
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

Just a Thought but the chip is just a small switch Yes there will be heat as it opens and closes but to have Excessive heat even with a fan on it makes me think something must be drawing extra current. Is anything on your Z-Axis binding? Or is something associated with your Z shorting out causing e...
by groguard
Wed Nov 12, 2014 12:46 am
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

There's nothing abnormal in the video that I can see. The LEDs on each axis are connected in parallel with one of the windings, so whether they are lit up or not depends on the position of the motor. So it may be perfectly normal for it to turn off. But it could also be entering thermal shutdown. T...
by groguard
Tue Nov 11, 2014 7:27 pm
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

Alright, I tried changing the acceleration and speed and I'm still getting the same problem. I've made a short video showing the GRBL board while its air cutting. It seems like the driver is cutting on and off. I'm baffled . Is it possible the driver is going out? Heres a video, I don't know if it w...
by groguard
Tue Nov 11, 2014 5:39 pm
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

I don't have my settings handy here at work, but I'm thinking my z-max rate is about 600-700 instead of 1000. I'm not sure what my acceleration setting is though. Anywho, just for reference-- it might be worth toying with slightly lower z-max speeds. I'll give it a shot. I had it set to 800 before ...
by groguard
Mon Nov 10, 2014 11:12 pm
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

Looks like acceleration is set too high, and possibly the max speed too. It doesn't sound like thermal shutdown, but more like you're pushing the motor too fast for the given current. So either increase current, or decrease acceleration and/or speed. Also check that you're getting the correct amoun...
by groguard
Mon Nov 10, 2014 10:48 pm
Forum: GRBL
Topic: GRBL Z axis issue.
Replies: 30
Views: 4136

Re: GRBL Z axis issue.

Looks like acceleration is set too high, and possibly the max speed too. It doesn't sound like thermal shutdown, but more like you're pushing the motor too fast for the given current. So either increase current, or decrease acceleration and/or speed. Also check that you're getting the correct amoun...