Air Turbine Tool Post Grinder
Here's my simple little tool post grinder for internal grinding. It's a 40,000 RPM air turbine I originally used in a duplicating carver for woodworking - now I have it mounted on an aluminum plate and Delrin blocks so it can be clamped in a lathe tool holder:
As you can see, the Delrin blocks are relieved to hold the on/off handle down in the "on" postiion:
Lined up on the lathe's rotational axis:
Approaching the chuck, getting ready to true up the internal surfaces of the jaws:
Grinding away, with little sparks a-flying:
I'm always careful not to tax the turbine's bearings by trying to grind too aggessively, and so far this little tool has performed very well for me.