Re: [ATM] Commercially available spherometer with MitutoyoDigimatic Indicator

[Dominic-Luc Webb <dlwebb@canit.se>]

Maybe I am slapping the face of decency, but since I am 
doing ATMing and not professional optics, I mainly never 
use a micrometer, ever. I spray water on the course glass 
surfaces and just look for ROC by reflected light landing 
on a piece of paper, and other cheap tricks. Occasionally, 
I do actually end up using these and mainly build my own. 
To that end, I once obtained a screw from Andy that works 
great. It has something like 100 or 200 turns per inch, I 
do not remember exactly (as said, I do not use these very 
much).

In light of the present discussion, maybe someone can suggest 
where such screws come from. I am at present in the USA and 
was thinking to buy precision threaded rod stock for such 
purposes, but did not find it on Ebay, etc. Maybe the original 
poster, as well as me, could benefit from knowing where one 
can buy such things and what kinds of specs, etc one should 
look for.

Dominic-Luc Webb
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