We still haven’t received the bits we’re waiting for, but today we at least managed to make some fine cuts. The micRo is excellent and whenever our incompetence gets out of the wait for a few minutes it really shines.
Today we painstakingly milled out a triangle of 20mm HDPE (with a dremel plywood bit with 2 straight shears and 10mm of cutting action). We plowed some furrows into HDPE playing feed rates, cut depths and bits. We found a couple of sweet spots that produced perfect cuts (350mm/minute, 2 flute rotozip bit – yet the tool was about 5cm long so we saw massive deflection in the range of 1-2mm. Useless!). We also cut a really encouraging knife sharp slot into Amfitop (a local dialect of Corian) with the same “useless” plywood bit mentioned above. This was done at 25mm/min rate.
After that we made a sharp small test cut into a 2mm aluminum sheet. We then prepared a small machine part to cut about whereupon the chuck promptly fell out of the spindle with a nasty screech. This has happened to us before and expect to just pound it back on like we did the last several times.
Our toolchain currently consists of TurboCAD for modelling, Cut2D for CAM and Simen’s own GRBL for motion control.
Our time in world as millers now spans all of 8 hours, and we’re pretty happy about the rate that our n00bness is dwindling.