From: Snag_one@msn.com   
      
       And now I know that the leadscrew is indeed Acme . I mentioned in   
   the other thread about making a mold of the threads using a lead ball   
   and a c-clamp. Well there ain't enough room under there for a clamp ,   
   but there is room for a pair of vise grips . And now I have a perfect   
   impression of an unworn section of the threads . You can't tell from   
   looking at the screw what the profile is . But after forming the lead   
   then cutting it with a utility knife blade to see the cross section it's   
   definitely acme . I shall be setting up a fixture* to hold a cutter at   
   precisely 14.5° on the mill and grinding the profile with my grinding   
   disc I bought for the end mill sharpening fixture . I'll need to hold   
   the small screwless vise in the mill vise to get a relief angle on the   
   cutters . I'll be recutting  another piece of stock - with the proper   
   angle and dimensions - as a fit check .   
      Clare Snyder and Joe Gwinn were both instrumental in my decision to   
   make the lead impression ... Thanks Guys !   
      * I'll need to grind both a 3/16" cutter for the boring bar and a   
   1/4" for the OD thread . This project needs more precision than I can   
   manage freehand . And I'll probably end up making one for the Y axis too .   
   --   
   Snag   
   We live in a time where intelligent people   
   are being silenced so that   
   stupid people won't be offended.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)