18 years ago
tractor and drives a cone, about a foot long which has a 1 or 2 tpi
square cross section (maybe 1/4" square) thread along its length. The
idea is the cone screws itself into the wood, splitting it. It works
really well, but over the years the tip has worn to the point where it
won't bite. He got it back working after a fashion by building up the
tip with an arc-welder and regrinding the point and first turn or two
of thread- but its a temporary fix.
Since about 4" of the tip of the cone is theoretically replacable
(assuming the rusted solid pins can be removed, etc), he was wondering
if a new tip might be turned on his SB 9".
He thinks the angle of the cone is about 10 degrees off the
centerline. The length is about 4". The thread cross-section doesn't
really need to be square, but it does have to be pretty deep and it is
1 to 2 tpi. He thinks the 2 problems are be getting his SB geared for
the threading and managing the taper (he doesn't have a taper
attachment), and was wondering what others might think of the problem.