Thoughts on HSS Toolgrinding
I prefer carbide inserted tools
for most lathe work--they're very convenient, cost effective if you shop
carefully for inserts, and I have used them enough that I know how to
get a good finish from them on my lathe. However, there are tasks where
HSS tools are ideal. This page captures some of those I've come across
Trepanning is a useful operation
that may be thought of as putting a groove in the face of a workpiece
on the lathe. The groove may be narrow, a wide recess, or even all the
way through to cut a disc out. Trepanning tools are available for mills
and drill presses especially for the latter purpose. Here is a sequence
published on HMEM showing how to trepan flywheels with a tool he has
Here are a couple
flywheels with trepanned recesses ground inside...
A look at the
tool that did the work...
The tool in
for grinding such a tool...
available treppaning tool for hole cutting: $29 apiece! You could grind
this shape pretty easily too...
I've tried to
grind my own trepanning tools for hole cutting on the mill with some success.
I started with a dulled endmill and ground all but one flute off and tried
to make that flute extend down as much as possible. I then installed the
endmill in a boring head and went at it:
tool ground from an endmill in action...
available trepanning tool of the type I show a cutter for above. It works
a little better than the hand ground endmill, but not hugely better...