On 11/19/2015 10:32 PM, 'Ron Goodger' email@example.com [SOUTHBENDLATHE] wrote:
If you grind or scrape or whatever the bed to make the ways straight, you have to do something to the saddle to raise it back up so the distance down to the lead screw stays the same.
An alternate way is to lower the lead screw support at the right end and the gearbox at the left end. The gear banjo can accommodate the slight position difference of the headstock etc.
Lathe saddles tend to wear in a curve, more at each end than in the middle, especially when the bed wear is in a short area. That indicates the lathe was mostly used for short work.
Standard practice when using non-metallic substances to build up the bottom of a lathe saddle is to mill the bearing surfaces straight so the added material will all be the same thickness.