From: none@none.com99   
      
   On 6/27/2024 12:35 PM, Snag wrote:   
   >    Am I really going to need to allow for millionths of an inch ? I'm   
   > looking at an 81 piece set from Shars , a grade B with the deviation   
   > table for under a hundred bucks . Looks like the biggest variance is   
   > .000034" , or about a third of a ten thousandth . I can't see any   
   > project that I might get needing that kind of precision ...   
   >    I'm considering buying the set just because I've kinda wanted some   
   > and I think they'll get me closer to perfect in my upcoming depth mike   
   > project . Since they can trace back to a national standard I can also   
   > use them to check all my other micrometers , none of which have been   
   > calibrated for at least 40 years , and in some cases longer than that .   
   >   
      
   You will probably be fine.  I hardly even use my gage blocks.  I just   
   CNC machine an angle plate with a stop.  I have a cheap B grade set, and   
   I miced them (I have Starret standards), and they are as good as I can   
   measure except the 4 inch which for some reason is almost exactly 4.001   
      
   I have a set of gage pins too.  Most of the time I just use my set of   
   drill blanks because its faster and most holes I'm checking are nominal   
   standard sizes anyway.  If they aren't I measure them with an inside mic.   
      
      
      
      
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
      
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