I'm having trouble cutting clean slots in cardboard tubing on my DIY CNC without the endmill causing ragged edges or fuzzing at the edges of the cuts. Any suggestions on tooling and feedrates/rpm invited.
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I'm having trouble cutting clean slots in cardboard tubing on my DIY CNC without the endmill causing ragged edges or fuzzing at the edges of the cuts. Any suggestions on tooling and feedrates/rpm invited.
How thick is the cardboard, how big are the slots, and whats your max rpm?
Pcb routers come to mind.
Use smaller cutter and make a pass along the middle, then a cleanup pass climb milling to finish. Cutter must be really sharp, and watch how quick it wears.
To make it last longer, on the finish pass use Z ramping down or up move to even the wear on the cutter. Down is probably better.
Keep the speed down, and feed up bit so there is a positive cutting action.
If it is not climb milling it will just push the stuff out of the way, hence the first pass to rough out the slot.
Ideally, low helix, downcut can leave burr below. upcut burr above.
HSS cutters will cut better when new (they are sharper), but carbide will maintain its performance for a longer time.
Matt