DIYbanter - View Single Post - Mortising machine--what am I doing wrong??!

charlie wrote:

When I get home from work this evening, I'm going to chuck-up just the
bit and leave the chisel off altogether and see how far I get.

Don't use just the bit. These puppies
ARE NOT as beefy as their "dedicated
just to making holes" cousins. To
increase shavings/chip removal, the
gullets (for want of a better term)
are deeper than their cousings, and
while they can take compression well,
they can deflect more. Deflect enough
and they snap - which is not good.

In fact, too much torque will also
shear them into two parts - also not
good.

charlie b