A Homemade Expanding Anchor

[Crusty]

Hey Marv,

The best way to thread up to a shoulder is to run the chuck and lead screw in reverse with the threading tool mounted on center but upside down in the toolpost. You start threading at the shoulder and feed outwards to the end of the part and so don't have to worry about crashes.

If the chuck and the lead screw rotate the same direction it will be a right hand thread - if opposite directions then it will be a left hand thread.