From: Snag_one@msn.com   
      
   On 9/21/2024 3:17 PM, Bob La Londe wrote:   
   > On 9/21/2024 12:06 PM, Snag wrote:   
   >> On 9/20/2024 5:51 PM, Snag wrote:   
   >>>    I got the back plate finished for the 3 inch chuck and I'm a bit   
   >>> disappointed at my initial testing results . I've measured .015   
   >>> runout on a piece of 1/2 inch stock that I'm pretty sure is straight   
   >>> . Might be the jaws since the chuck body indicates about .004 near   
   >>> the face . These are the inside step jaws and the clamping surface is   
   >>> not very long so that may be part of it . I'll be installing the   
   >>> outside step jaws tomorrow and checking them - it came with 2 sets of   
   >>> those , one which matches the chuck s/n and one that doesn't . The   
   >>> inside step set I have installed do not match numbers ... aaahhh ,   
   >>> what should I expect for a $10 yard sale purchase !   
   >>>    Actually , it may be as simple as regrinding the mismatched jaw   
   >>> sets to match this chuck . I have a little time to play with it , got   
   >>> no "other people's projects" in the shop right now .   
   >>   
   >>    Further testing having been completed the chuck has runout with all   
   >> 3 sets of jaws of around .007" . Chuck body is more like .002-.003 . A   
   >> known straight 1/2" rod is not pointing  straight with the ways ...   
   >> looks like it's time to set up the toolpost grinder .   
   >>    So it looks like maybe a cheap chuck , though well made . Fit and   
   >> finish are good , everything fits as it should and the scroll moves   
   >> smoothly with all 3 pinions . Which brings me to a question - since   
   >> there's more than one pinion is it going to make any difference which   
   >> one I use ? Do I need to give 'em all 3 a twist when I mount a piece   
   >> of stock ?   
   >   
   > Does a known straight rod point straight and parallel if is directly in   
   > a collet that fits in the native spindle bore?  If not then level   
   > (untwist) your lathe before doing anything else.   
      
      The lathe is level and no twist as measured with a .005"/foot   
   precision level . I have no collets to test with , but with the 5" 3 jaw   
   I get no  measurable taper .   
      
   --   
   Snag   
   Voting for Kamabla after Biden   
   is like changing your shirt because   
   you shit your pants .   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)