From: none@none.com99   
      
   On 6/26/2024 11:47 AM, Snag wrote:   
   >    I scored a Mitutoyo unit a while back at a yard sale . It only had   
   > one rod , 0-1" and I wanted more ... so I bought some on eBay . Thing is   
   > they must be for a different model micrometer , they're all 5/8" too   
   > long . And not 1-2 , 2-3 , etc . So I was thinking that I can cut them   
   > off to measure correctly in my unit . This will give me 0- 5" if I cut   
   > them to the appropriate lengths . It looks like I won't have to be   
   > absolutely on the mark since there is a calibration adjustment on each   
   > rod . I'm thinking that my Dremel in the toolpost clamp and a cutoff   
   > wheel , then a light polish with a fine grinding wheel also using the   
   > dremel . I have 123 blocks that I can set up to calibrate - maybe not as   
   > precise as a metrology lab , but I think close enough for what I do .   
   >    Does this sound doable , and any suggestions ?   
      
   There are two depth mics in my shop.  One is a Shars set I bought new,   
   and the other is old Craftsman maybe?  Anyway, they have a domed or   
   convex end on them so that the contact point is very small.  Look at   
   your other anvils/rods for the shape.   
      
   If you get the dome very close, then you could polish a couple tenths   
   quite easily using your 123 blocks and a small inexpensive surface plate   
   to check as you go.  You might not make the metrology snob happy, but   
   you should be able to get significantly closer to .000 than .001.  With   
   some, but not excessive, care you could get really darn close.  If you   
   have a tool and cutter grinder or surface grinder, and any kind of   
   fixture for turning the rods you could turn a shallow cone pretty darn   
   close and polish to finish with just tiniest of flats on the end.  A   
   cone is maybe not quite as durable as a dome, but you will probably wind   
   up with a tiny flat or dome anyway.   
      
   I don't bother to "precision" calibrate the mic myself.  I just take a   
   quick reading on something close like a gage block, 123 bloc, etc, and   
   then add/subtract the error to my final reading.   
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
      
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