So I’ve been working on a few badges as gifts and as practise because the whole CNC/CAD/CAM is rather new to me. I’m pretty pleased with how they came out: good enough for an amateur as my dad used to say. It’s true you learn so much from just doing stuff. I made at least ten of the PERFX one before I got it right. The Arsenal badge gcode was courtesy of @JakeB, many thanks!
Key learning points: you can get away with murder with these, the paint distracts the eye!
I like it when the knots appeared prominently, I don’t know why.
I did learn that if you incorporate different tools into a piece, estlcam inserts a stop for you to change the tool, probably obvious but I didn’t get it.
Another observation: if I start my spindle before the board or whatever is controlling the motors, there is enough vibration for the Z-axid/spindle to drop into the board slowly. How did I discover this? When for the umpteenth time I started a job and the endmill dragged right across my piece. Well, at least I know now.
I had a bit of an experiment last night with feedrate. I made all these badge things at a pathetic feedrate of 2.5-5mm/s with a 1/8" endmill (2 flute I think), 2mm depth per pass, and all to avoid the noise and vibration of faster rates. I thought the noise and vibration were a signal that either the feedrate was too high or the tool was getting blunt. I assumed these faster rates would lead to poorer cuts too, but that’s not the case. On the left are 1mm doc, 2mm on the right, with feedrate increased way beyond what I thought reasonable, up to 30 mm/s, which seems insane. Of course what’s clear is that at that feedrate, there’s a huge deflection when the cutter hits the material.
Is there a way to mitigate this? Angled descent then return to cut full depth?
Still, I’m amazed at the capacity of this system to cut, it’s much more powerful than I expected