From: muratlanne@gmail.com   
      
   "Bob La Londe"  wrote in message news:103kkic$3nnjj$1@dont-email.me...   
      
   I've made a few parts to scribe lines and center punches.  I made a   
   point of it after my son gave me an optical center punch set for   
   Christmas one year.  I even have a couple height gages with carbide   
   scribes for helping with layout, although one usually only gets used to   
   measure tool heights to be entered into a CNC machine's tool table.  Its   
   pretty scary when I bring that carbide scribe down on top of a 0.026"   
   ball nose end mill to measure the height.   
   Bob La Londe   
   --------------------------   
   I haven't seen much if any need for manual layout when making new parts to   
   drawings, it's for modifying existing parts and castings that lack drawings   
   and reference surfaces. I use it to mount electrical components in plastic   
   cases that compress when held firmly enough in the milling vise and can't be   
   repeatedly zeroed.   
      
   For instance I repaired a pivot hole in a control handle that had become   
   egg-shaped almost to uselessness by locating the original center by running   
   a plug against the unworn side, boring the hole larger and pressing in a   
   bushing. This helped repair a $100 Toro 724 snowblower with all repairable   
   metal parts and good balance that doesn't hurt my back to maneuver. I can't   
   usually repair broken plastic, I have to redesign the part in metal. A new   
   plastic part could fail the same way when it becomes brittle in the cold.   
      
   Another way to mark a hole center is to press in a wooden plug and into that   
   a square of sheet metal with its corners turned down. If other centers are   
   known they can be used to scribe the missing center on the sheet metal.   
   Punch, center and bore it on the mill or lathe. Taps ground between centers   
   are useful for locating tapped through holes, pointed setscrews for blind   
   ones.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)