I have posted elsewhere on the forum about the peculiarities of the Oozenest implementation of the rep-rap firmware on the Duet controller - in particular the use of G54 as machine co-ordinates. This is modal (stays set until you change it) and I ran into a problem with it recently. I ran a job with no problems and wanted to run it again the next day. My machine was turned off overnight, but I knew it remembered workplace coordinates so homed the machine, jogged close to workplace zero and ran g-code. The machine headed straight for machine zero, snapping my bit as machine Z zero is below the spoil board. Obviously I had not changed to workplace coordinates.
Alex.

 

Good point, and one I intend to implement next time I wind up my workbee.
Thanks
Alex.

 

It's over two years since I started this build report, and I have learned a lot since then - from using the workbee and, not least, the Openbuilds forum. The latest experiment was cutting a replacement arm rest bracket for one of my sons' wheelchairs from mild steel on my un-modified Ooznest workbee - (Chinese clone) Makita @12.5 K rpm, 250 mm/min, 0.1 mm doc. Single flute 3 mm spiral upcut. Blue masking tape and superglue to hold the material.

I could undoubtedly have gone faster and deeper, but didn't want to push my luck with a first attempt.

 

I was a bit nervous about this, hence the cautious feeds and speeds, but the result is way better than anything I've achieved with aluminium.
Alex.