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Gerald loses power during a cut #1003

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amcewen opened this Issue Dec 13, 2018 · 5 comments

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amcewen commented Dec 13, 2018

Over the duration of a (reasonably long) cut, Gerald's power fades from good enough to cut all the way through to barely noticeable.

It doesn't seem to be alignment of the mirrors or the bed, as the cut I've just seen it on had some concentric circles (about 400-500mm in diameter) and one of the earlier cuts had cut through fine, whereas another about 10-20mm larger in diameter around the first wasn't cutting.

@MatthewCroughan

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MatthewCroughan commented Dec 20, 2018

Observed this when I was cutting a large 400+MM circle with Hugh Miller who makes furniture and occasionally hires me to assist him with the laser cutting. Resulted in a half hour rescue mission manually editing nodes in the software.

I don't believe it can have anything to do with laser alignment, since the rescue was successful, we got it to cut exactly where it stopped with editing and a redownload, if it were the mirrors then physics wouldn't allow that to be a solution.

That leaves a few options in my mind:

  • Dodgy Power supply
  • Corrupted files in transfer over wire
  • Corrupted data in RAM

I will attempt to reproduce this by testing if it can cut for sustained periods, and if it trails off towards the end, since that seems to be when the issue occurs prominently.

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amcewen commented Dec 20, 2018

Diane had had trouble with it on Tuesday, and I took the air assist off to see if it improved matters. They said that it did cut better, but yesterday Suzy was running it and having similar problems with the air assist off still, so agreed that it probably isn't alignment.

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amcewen commented Dec 20, 2018

It does seem to be suspiciously in the centre of the bed that it's struggling though, which could be a coincidence on how long the cut has been, but might also point to something else...

Depending on how swappable the power supplies are, Simon (who I built the Play The Tree lights with) has a spare 100W power supply from his laser-cutter. So if we think that's suspect I can find out more to see about possibly trying it in place...

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MatthewCroughan commented Dec 20, 2018

@amcewen How soon do you think we could get that going?

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magman2112 commented Dec 21, 2018

I did a few checks on Gerald yesterday before Maker night. I found that one of the mirrors was loose on the y-axis (it moved when I tried to clean it with a cotton swab) the mirror was also badly scratched.

I found and fitted a better quality mirror in the laser spares cupboard, making sure that it was fitted tightly in the mount. I then did a realignment with the new mirror and was then able to cut 3mm ply on 70 power and 24mm speed over most of the bed. I also was able to cut 8mm ply at 6mm speed. I re-fitted the air assist as well, though I had to hunt for the parts, as they were in different places in the room. In future, these parts should be placed in the laser spares cupboard, rather than left lying around (if they need to be moved again).

I will hopefully be in DoES over the weekend, so I will see if Gerald has been behaving before closing this issue.

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