Mechaduino heat resistance??

[Jeno Bozoki]

Hi,

I'm using a Kickstarter version of Mechaduino with the stepper_nano_zero firmware.

It worked OK for many months.

Now I started to print with ABS on a heated bed (110C) in a chamber.

My Y axes started to misbehave after about an hour print. There were still some PID control, but it definitely didn't work. On one side of the Y axe it just stoped. (Ie it didn't  go below for example  40 mm, only by hand)

When forced by hand, then there were sudden motions.

The effect remains after the printer cools down. Only a recalibration helps. 

I assumed a hardware failure, so I replaced it with another Mechaduino, but it produces the same effect.

Does anybody has any experience with Mechaduino in a heated chamber?

Regards,

Jeno

[Trampas Stern]

Check that magnet is still glued to motor.

Also I think the mechaduino uses a 85C rated processor, this does not mean it won't work at higher temps but that Atmel does not qualify it.

Additionally the magnet can loose strength with high temperatures.

Trampas

[Jeno Bozoki]

Magnet is ok.

After a reflash/recalibration the whole system is normal.

I used your code to store the calibration data in the nonvolatile.cpp, after that a cold restart solved the problem.

But now it's happening mid print, so it seems the nonvolatile loose it's content. I'll have to check if the other setup parameters are kept.

I'll try Today with a small fan.

[Jeno Bozoki]

It was the magnet. I have a magnet holder glued into the shaft, that was ok, but the magnet itself was rotating (very little) in the holder.

It seems that caused the problem.

[Trampas Stern]

Yeap I ran into the problem myself, took me awhile to figure out...

Trampas