Problem cutting 10mm Acrylic

Hi all,
I’m having an issue cutting 10mm acrylic, which I have cut in the past (2021) with my 100 watt Lighblade CO2 laser, (not sure what release of Lightburn was around in Jan 2021) so used my tried and tested settings of 4mm/sec @ 75% power, with the file created today using Lightburn 1.6.03.

At these setting I would expect to be drawing 28mA and cutting the acrylic in one pass, but its drawing 3.6mA (a lot less than normally associated with 100 watt of power) and barely marks the surface with very little depth.

I know the laser tube works as I can cut the 10mm acrylic using the Ruida pulse and movement buttons at the same speed and power. I also cut some 5mm acrylic at 15mm/sec and 50% power immediately before, perfectly fine.

I tend to transfer the file between laptop and Ruida controller by memory stick, but since the files for the 5mm and 10mm acrylic were transferred at the same time both on and off the stick I’ve ignored this as an issue.

I have rebooted Lightburn, recreated the hexagon and used a different layer without success.

The Ruida RDC6442S seems to be functioning correctly, as does the CW-5200 water chiller, so I presume it has to be the file, which I include for peer review, with the hope that someone can spot the issue.

360mm_hexagon.lbrn2 (9.2 KB)

I also include a snapshot of the File and device settings, as the issue eludes me!

Thank you in advance of any useful solution to this issue.

Ruida controllers have a Start Speed setting, typically 10 mm/s, below which they apply the Min power layer setting. With a Min power of 10%, it wouldn’t cut butter.

Increase the Min power to, say, 50% and see if that changes the outcome.

If so, then pick one or more:

  • Boost the speed above the Start Speed
  • Reduce the Start Speed
  • Increase the Min power level for the layer

From the doc:

2 Likes

Hi Ed,
Thank you for your quick reply.

I took your advice and turned the minimum power up to 50%, and that made a world of difference.

Had to notch it up a little higher to get a clean cut in a single pass for this project.

I will look into different speeds and max - min power combinations to determine the best settings for my laser in the future.

Will keep my eye out for a Ruida manual if there is one to stop any future surprises spoiling my day.

Many thanks for your advice.

It’s not clear if this is an Official Source, but the manuals seem pretty much the same wherever they go:

Fire away!

Ed,
Thank you for the Ruida manual link, downloaded a copy for a spot of light reading.

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