I’m having an issue that I’m hoping someone might know more about. I’ve broken two bits so far. Both broke and I left the rest of the stock attached so I could order another and continue the job. I have a hunch but wanted to ask others before I snap another. I’m trying to cut these little luchedor masks out of 320 brass. I’m using Amana’s ZrN coated 1/16th bit. (#46290) I’ll post all my feeds and speeds at the end but the odd thing is that all goes well until the very last second, when the “mask” separates from the stock. It cut the pockets first, then the drilled holes, and 99.9% of the profile with no problem. Each bit broke at the exact same time. It’s secured to the spoilboard with double-sided tape first, and clamps at each end. I suspect that, despite how well the tape holds, at the moment of separation, the mask moves just enough to knock the fragile bit and break it. With that hypothesis, the next time I try it, I’ll secure the masks to the spoilboard with a screw through the already drilled nose hole. What does anyone else think? Thanks for any help in advance!
Amana ZrN coated 1/16th, 3 flute EM
Feed: 20 ipm
Plunge: 10 ipm
I think I’m doing a pretty good job of keeping the chips cleared.