Dear All, I missed the first part of this posting ,so I dont know the
size of the Lead screw. However 2 years ago I straightened a 3ft 3/4"
screw on a Theil Miller. It was bent 100Thou eccentric but took less
than 1/2 an hour to get within 0.5 thou of concentricity. The method was
suggested by my friend Harold who called It a "Jim Crow".
Take 2 pieces of angle iron I used 2"x2"x6"
long ,on the first I welded a piece of 1/2" square bar on the 2nd at
each end I welded a similar piece. Place the angle iron between the vice
jaws. Mount leadscrew between centres on lathe. "clock maximum
eccentricty, mark ,transfer to vice ,nip gradually,transfer to between
centres,re-clock, transfer to vice-repeat ad nauseam and in about 1/2
hour good as new leadscrew!
Kind Regards IanIn article afn2nvg7s4m0ldkni48gk7mobqee2ur
, geoff merryweather
writes
Gunner, have you looked at the precision leadscrews from
http://www.mcmaster.com? My FiL used one to fix up his lathe -
accurate and cheap.
Geoff

--
ian R. Weeks