From: muratlanne@gmail.com   
      
   "Snag"  wrote in message news:vu63mc$2qjrd$1@dont-email.me...   
      
      The problem with that is that I'm not certain what the thread profile   
   is - probably acme but ... I was just thinking that I can make an   
   impression of the leadscrew , wax might work or clean the leadscrew well   
   and apply a release compound and mold one out of JB weld ... and use   
   that impression to grind a cutter . That piece of plastic is dialed in   
   on my 4 jaw , and ain't coming out just yet .   
   --   
   Snag   
   ---------------------------------   
      
   An old way was to fit a piece of thin sheet metal into the leadscrew   
   grooves, holding them up to the light to see gaps to remove, like restoring   
   a wood chisel or plane blade with a square. Another was to press sheet lead   
   into the thread or gear teeth. When you have a light-tight match you measure   
   the angle and grind the bit to it, perhaps narrower so you can adjust the   
   depth and width separately to fit. I made a fly cutter to mill an ANSI   
   involute spline broach by cut and try.   
      
   Polymer clay works well to copy shapes, such as your partly cut thread. It   
   hardens when moderately heated and can be cut into a flat template. I didn't   
   find a cheaper lubricant-filled alternative to Moglice, Rulon etc. though   
   some suggested JB Weld.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)