hello. ive noticed recently that im getting some chips in the material when pocketing and contouring cast acrylic. since getting the HDM i’ve made many changes to my CAM and rather than go back and redo everything to see what the culprit might be i figured I’d ask here in case its some thing simple.
maybe dont use an upcut bit? I cant see how that would be beneficial. Maybe go with a single flute for all the roughing out and hit a finish pass with a higher flute count to prevent as much melting as possible. Using a downcut will hopefully keep the edges from chipping. Cast acrylic is pretty brittle, well, all acrylic is pretty brittle in my experience.
and everything is working great. I went ahead and moved to a new bit just in case but the increased DOC has me cutting faster than before even with the slower feed. Beautiful surface finish and no more chipping.
Pretty sure it was there tool. I was using those speeds and feeds for awhile without the chips. That said I’m glad to have adjusted the speeds and feeds because i feel the quality is better and the runs are over twice as fast. My previous machine had an anemic 500w spindle that my previous recipes were cooked up to suit. Been so busy with production I haven’t found time to play around with optimizing for the HDM.