Quote:
Originally posted by jaydee116
Your going to need about 16,000-20,000RPM for those to work in any type of metal. At least thats what the last chart I read said.
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Actually, quite a bit higher than that even. ~20K would be a near absolute minimum. You'd probably want to be looking at ~30K RPM or so, and even then, the feed rate and depth would be astronomically slow.
I'm used to 1mm mill bits. With a ~0.4mm mill bit as talked about here, you need to feed at least 2.5x slower, you cut 2.5x as shallow, and you have to make 2.5x as many passes.
Basically it would take around 16x longer as it takes with 1mm mill bit to carve out an equivalently sized set of channels.
It'd be faster and cheaper to just EDM the channels into copper, than to actually cut them out. However, if you have the bits, the mill and the machine time is "free", then yeah, I guess spending ~10 hours of machine time to carve out a single micro-channel block would be quite an interesting experiment to see.