Ten-Cent Solution for Hollow-Chisel Woes
I’ve just purchased and set up a hollow-chisel mortiser. However, when I turn the machine on, it makes a screeching noise and then when I cut a mortise, the chips clog the chisel and burn. What am I doing wrong?
Arthur Laney, Pittsburgh, PA
By the sound of it, your auger bit must have little or no room to turn within the hollow chisel. The bit is fatter at its tip and needs to stick out from the end of the chisel a little. To set this clearance properly, I use the “dime trick”: Simply install the chisel with a dime between the chisel and mortiser and tighten it in place. Then, using a scrap as a pad, push the bit up until it is seated against the chisel and tighten it. Finally, loosen the chisel and push it up as far as it goes—the space where…