From: Snag_one@msn.com   
      
   On 6/26/2024 3:21 PM, Bob La Londe wrote:   
   > 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.   
   >   
      
      These are all flat on the tip . I can see the point of making the tip   
   rounded or conical . These all have an adjustable collar with a lock   
   ring on the top end , so I figured on polishing them a thou or three   
   short then adjusting - start with the collars bottomed out (lightly) on   
   the threads .   
   --   
   Snag   
     It's great to be straight !   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)