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Hello Phil and welcome to the forums...

what material/species of wood ate you working w/???
is the bit set new???
how much material are you removing per pass...
what is the manufacturer's recommended RPM???
any skip or choppy looking marks on the cut wood???

A dull bit cuts poorly and builds up heat doing so. If you can run the cutter over your fingernail without shearing off a shaving, then your bit needs sharpening...
Resins and dust build up on the bit cause overheating...
hogging out large cuts in even the hardest of woods stress the bit, causes tear-out, and will cause overheating....



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