I haven't posted anything for a while here's my progress. I installed removed and scraped the bottom of the headstock 20 times. My final results are .00027 down and .0001 towards the operator at 12". Taking test bar sag of .00017 into account that puts the headstock within .0002 over 12". Bob
I ground the tailstock base and installed bronze shim stock. The base was worn .026 with most of the wear at the front.
Rebuilt the worm gear. The internal key was worn by over .060 and the gear had .020 oval wear inside. I bored the gear to .874 then took a piece of .875 by .065 wall tube bored it to .753 and cut a 3/16 key way in it. The new feed shaft is .749. The key was welded to the sleeve then the sleeve was pressed in with locktite 609 bearing adhesive. I will drill and install a set screw on each end the weld the screw to prevent movement.
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