From: muratlanne@gmail.com   
      
   "Snag"  wrote in message news:vbgc4r$15175$1@dont-email.me...   
      
   On 9/6/2024 8:07 PM, Jim Wilkins wrote:   
   I read somewhere that chuck backplates for threaded spindle lathes   
   should be soft cast iron instead of steel to minimize spindle thread wear.   
   ----------------   
      A piece of cast that size is a good bit more expensive ... if I could   
   find one .   
   Snag   
   ---------------------------------   
   Gym weights?   
      
   A dumbbell became the ball pivot feet of my hoisting shear legs. The iron   
   cut easily enough without annealing in the wood stove. I judge cast iron's   
   condition by the chips, compared to known-good pieces like backplates. The   
   worst crumbly cast iron I've machined was the head of a Duracraft drill   
   press. Pipe fittings have mostly been pretty good, as was my second-hand   
   (self-annealed) Taiwan wood stove to which I added a small window.   
      
   http://www.chaski.org/homemachinist/viewtopic.php?t=102818   
      
   https://www.slfcastings.com/heat-treatment/   
      
   I turned 1-1/2 - 8 and 2-1/4 - 8 dummy spindle ends that fit my Bison chucks   
   closely to use as Go gauges, and to take on treasure hunts to check sizes   
   instead of trying to measure or guess between 2-1/4 - 8 or 2-3/16 - 10. The   
   2-1/4 - 8 stub was a scrap of 2" water pipe. The 1-1/2 - 8 stub has a 1.00"   
   shank to mount a Jacobs 58B chuck in a collet.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)