Froneck
Titanium
- Joined
- Dec 4, 2010
- Location
- McClure, PA 17059
I posted a while ago requesting information on the back-lash adjustment screws and received no replies. Simple mechanism I seen it used on another lathe. A worm gear is cut into a jam nut and 2 screws used as the worm. Loosen one, tighten the other will rotate the jam nut removing back-lash. However in my machine the screws will not tighten, little more than snug and they push away from the worm gear. Lathe runs great, cross fees screw shows little wear if any at all.I mentioned they were 3/8-16 but in checking they are 1/2-13. The hole they fit into is .550 so 9/16" will not fit. .550 gauge pin is snug fit. I don't know if P&W had special screws made. To help I used longer screws that extend past the gear and made a half round cradle with .500 on the same centers as the .550 holes to hold the screws on the gear but didn't help, better but not much! Gear looks to be in good shape!
What is the best way to measure the worm gear to determine what worm is needed and what centers are required.
What is the best way to measure the worm gear to determine what worm is needed and what centers are required.