From: none@none.com99   
      
   On 6/27/2024 4:56 PM, Snag wrote:   
   > On 6/27/2024 4:56 PM, Bob La Londe wrote:   
   >> 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.   
   >>   
   >>   
   >>   
   >>   
   >>   
   >   
   > I'll probably only use them for calibration checks . And only because   
   > one of these days something I make is going to have to be a pretty   
   > precise fit for something somebody else makes . Gauge pins are on my   
   > wish list too . I got a set of thread wires a while back . Haven't used   
   > them yet but then I haven't needed a precise thread fit . I have a   
   > couple of projects in mind that will require a fairly precise thread ...   
   >    OBTW , I did order that set of Shars blocks . Under 110 bucks , and   
   > there's no doubt that if I waited I'd be paying more .   
      
   Yes.  Everything always goes up and lately very quickly.  I've been   
   bringing in some cash the last couple months, so I have been buying   
   things I need and stocking up on materials so I'll have it when things   
   inevitably crash again.   
      
      
      
      
      
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
      
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