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From: Snag <Snag_one@msn.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Gauge blocks
Date: Thu, 27 Jun 2024 18:56:26 -0500
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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 .
-- 
Snag
  It's great to be straight !