Brent,


Some 0-1" micrometers came with a 1" standard in the form of a round disk 1"
diameter and about 0.25" think. They had a hole in the center, presumably to
help grasp them and also to hang them up.


I have an old B&S 0-1" mic with the Vernier scale to read to 0.0001. This has
B&S a black cloth-covered clamshell case with spaces for the adjustment wrench
and the disk standard.


[I don't believe that a simple micrometer like this can actually read down to
0.0001.  The last digit is probably more of a "suggestion" than a fact.  Just
holding the mic in the heat of your fingers might make a difference - and
Starrett certainly made mics with hard rubber insulation on the frame.]


John Ruth

________________________________
From: OldTools  on behalf of Ed Minch 
Sent: Monday, November 13, 2017 1:55:43 PM
To: Kirk Eppler
Cc: Tools Old
Subject: Re: [OldTools] Hot mic

Would it be true that once you are zeroed, then everything HAS to be right
because of the threading of the “plunger thingy”?  Also, a penny would seem be a
bad gauge because they aren't all the same to start with and they wear.

Ed Minch




> On Nov 13, 2017, at 11:18 AM, Kirk Eppler  wrote:
>
> But how do you test the full scale?
>
> I've seen lots of tools with a penny in the case = 0.75"  Don't know if
> they can claim 0.750"

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