Failing to home - ORTUR laser master 3 LE

[qwanzaden (Chris)]

I have a new (<100 hours of use) ORTUR laser master 3 LE, which randomly fails its homing cycle/procedure.

The ORTUR laser master 3 and laser master 3 LE (LM3LE) does not use a limit switch for its homing cycle. My LM3LE sometimes successfully homes, sometimes throws a error, and sometimes endlessly rams itself into the hard stops making a rattling noise. This appears to be a failure of ORTUR’s software-based jam detection algorithm.

As a workaround I disabled the homing cycle to prevent damage to the LM3LE, but its a huge problem not being able to home. I’ve tried to find a cause-and-effect to the problem but can’t find one. The machine has periods of working, then periods of not working. Other people are having this issue too. I’ve contacted ORTUR and will add their feedback when they give it.

Cross posted here. Firmware is version 209 (most recent).

[gilaraujo (Gil Araújo)]

A video of the machine homing would be greatly helpful

Belts tension and frame squareness are paramount on Switchless homing machines as is all done by software.

A video would help to validate that

Or if you like to test belt tensions engrave this pattern on a bit of cardboard and take an up close picture

Dot Test with Angle.lbrn (46.3 KB)

[qwanzaden (Chris)]

The last three links in the second paragraph of the original post are links to videos of the three kinds of homing cycles I am seeing (working, error, and noisy ramming). The x axis belt seemed loose to me but I don’t see how to tension it.

Here are two photos of the pattern that you sent me.

And here is a link to a video of me plucking the y axis belt. At a previous job we used the frequency of the vibration of belts to determine their tension so… maybe that’s helpful?

[gilaraujo (Gil Araújo)]

The patterns are spot on.
So i am assuming what is happening on the homing is intermitente.

But not related per se on belt tension.

Try $RST=* in console to reset all to defaults
And support@ortur3d.com to know if they have any newer firmware
Seems to me though it might be more firmware side than mechanical

[qwanzaden (Chris)]

After tightening the X axis the device homes correctly without making a loud clicking noise. Video for X axis tightening. I suspect the belts should be tightened until each side of the belt makes a low-pitched humm instead of “flop”-ing when plucked. Thank you @gilaraujo for your help.

The X axis belt on my machine is as tight as the screw will allow, but is still loose. I’m lucky the machine functions despite this. For people who can’t tighten the Y axis enough, playing with the pictured values might save you? Its scary the machine’s “limit switches” can malfunction like this.