Chrispy
Established Member
As said before if its getting that hot there is a lot of friction some where. Try taking the chisel out and checking the inside for build up of wood chips/ carbon from cutting, it can be quite difficult to see as it gets so burnished you might need to rake it out with something like a needle file.
You say the machine is used so are the chisels used as well? are they sharpend properly? with clearance for the waste.
You say the machine is used so are the chisels used as well? are they sharpend properly? with clearance for the waste.