Z-Axis Stepper Cooling - Ideas?

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izumi5188
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Z-Axis Stepper Cooling - Ideas?

Post by izumi5188 » Sat Jan 24, 2015 10:13 pm

It appears my Z Axis motor likes to generate some heat. This worries me a bit. It appears to be a known "issue" in the wiki. Does anyone have any ideas of how to attach a fan or other way to pull of some heat? Like I said it worries me a bit.
-IzumI-
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Dhpenner1
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Re: Z-Axis Stepper Cooling - Ideas?

Post by Dhpenner1 » Sat Jan 24, 2015 10:30 pm

Heat Sink and some thermal paste or machine a small fan mount.

clockit
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Re: Z-Axis Stepper Cooling - Ideas?

Post by clockit » Sat Jan 24, 2015 11:01 pm

have you tried decreasing the current going to it yet? http://www.shapeoko.com/wiki/index.php/Tuning
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Caesar S
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Re: Z-Axis Stepper Cooling - Ideas?

Post by Caesar S » Sat Jan 24, 2015 11:02 pm

Have you checked the z-axis current setting? It's on the g-shield board, small green square with a white dot in the middle. Pick the one nearest to the Z axis mark.

Turn everything off (power to the arduino, power to the g-shied, power to the stepper motors, at least).

With a small screwdriver turn the white dot all the way to the left and back maybe some 30 degrees (don't meet or exceed to middle/top). That should get the z-axis motor current down. If the motor was hot due to too much current, it should be cooler now with less current.

izumi5188
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Location: Madison, WI

Re: Z-Axis Stepper Cooling - Ideas?

Post by izumi5188 » Sat Jan 24, 2015 11:54 pm

I have reduced the the current several times during tuning. Try to see how much I needed to go up and down with out skipping. But it still seems to get pretty hot.
-IzumI-
Shapeoko 2 : With Works Kit and 1000mm Expansion
Upgrade with X-Carve, Acme Screw kit, and X-Controller

clockit
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Re: Z-Axis Stepper Cooling - Ideas?

Post by clockit » Sun Jan 25, 2015 3:06 am

does it just stay hot? Hot long does it take in a typical job to get hot? Has it gotten hot enough to go into thermal shutdown where it starts missing steps?
Shapeoko 2, Full Kit #7071, Makita RT0701C Router, 1000 x 1000 upgrade, Acme Z Axis w/Nema 17 Belt Drive

izumi5188
Posts: 64
Joined: Mon Dec 08, 2014 7:38 pm
Location: Madison, WI

Re: Z-Axis Stepper Cooling - Ideas?

Post by izumi5188 » Mon Jan 26, 2015 5:39 pm

In a half our job it gets pretty hot to the touch. I have currently zip tided a spare fan to it and it really has helped. I'm playing with the current more to see how low I can get it before it starts to skip now. Right now its at about 10 o'clock.
-IzumI-
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Schruminator
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Re: Z-Axis Stepper Cooling - Ideas?

Post by Schruminator » Mon Jan 26, 2015 6:15 pm

I put a heat sink on top of mine as well as hung a few 40mm CPU fans off of the side of it. Looks a bit ridiculous, but it does the trick.
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cvoinescu
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Re: Z-Axis Stepper Cooling - Ideas?

Post by cvoinescu » Mon Jan 26, 2015 7:05 pm

izumi5188 wrote:In a half our job it gets pretty hot to the touch.
That doesn't sound too bad. Too hot to touch even briefly is probably too hot, but 70°C (can't hold finger on it for more than a second) is acceptable. The other motors are in contact with the large metal plates that act as heatsinks; the Z motor isn't, so it tends to get hotter than the others even at the same current. As others said, put a heatsink on it if it makes you feel more comfortable.
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twforeman
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Re: Z-Axis Stepper Cooling - Ideas?

Post by twforeman » Mon Jan 26, 2015 8:28 pm

I bought some heat sinks and thermal paste for my Z motor, but haven't mounted them yet since I'm planning on re-vamping my Z soon.

I also just remembered that I bought a non-contact thermometer not to long ago and I should pull it out next time I run a job and see how hot the Z motor is actually getting! Silly me.
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