After having practiced the CAM art and having tuned the machine on wood, I’m finally trying to cut carbon fiber (3k, twill weave, 2mm thick sheet) but cannot get a decent job done. I’m using a 2 mm ball nose, two-flute upcut bit, 1/8" (3.175 mm) shank. My spindle maxes out at ~12.000 RPM but the last 1k makes it whine and shake a little, so I usually run it at 10.000 RPM tops.
I’m cutting 3mm deep to compensate for the ball nose bit - that’s the only 2mm one I have at the moment, I’ll order some PCB/fiberglass milling (diamond pattern) bits soon.
Here are some pictures of my workpiece. The pieces underlined in red belong to the first cut, the ones in yellow to the second; videos of the first cut are included:
|1st cut||5 mm/s||1 mm/s||9000 RPM||1 mm|
|2nd cut||2.5 mm/s||0.5 mm/s||10000 RPM||0.5 mm|
The material is rather stiff, but it is plausible that it flexes down when the bit plunges and hence the problems with the cut’s depth, especially when restarting after an holding tab - should I come up with a better fastening solution, maybe a support in the center?
Can anybody point me in the right direction to start getting half-decent results?
P.S.: @vicious1, how can Imgur albums be embedded here? I’ve tried by injecting the embed code via bothe the post’s source and media embed dialog, but it won’t work.