Re: [ATM] Dial Indicators

[Jim Burrows <burrjaw@earthlink.net>]

At 2005-08-15 11:18 -0700, Jim Johnson wrote:

>I am looking to purchase a dial indicator for a
>Foucault tester I am building.

.001" is good enough for Foucault testing (in fact, Tex sez, p. 85, .004" 
allows "... (for [mirrors ~ 8"f/6]) a precision ten times better than the 
Rayleigh tolerance.")  If you're really obsessive or going to try the LWT 
test (needing another digit accuracy), I'd suggest pushing on the KE 
platform with a micrometer.  I've got an NSK, 0-25 mm, with a vernier going 
to .001 mm (4E-5"!).  I was going to use it on my xy-dingbat, but its neck 
is just a bit larger than the .001" micrometers currently on it<grumble>.

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84) 

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