On Wed, 08 Dec 2004 09:41:19 -0500, "
wrote:

Having difficulties mortising BB but not hardwoods.

Soft timber expands more on turning it into chips. Try setting the
auger up to leave a little more space between it and the chisel. If
you use the "nickel trick" to set the chisel & auger position, use a
slightly thinker nickel.