Re: [ATM] Commercially available Fine Screws

[Ken Hunter <atm_ken_hunter@yahoo.com>]

That's all well and good however... I find that with a lot of practice I'm just able to tell when the center contact touches the glass to a repeatability of .0001 inch and only on very good days. On a micrometer where the "feel" of contact is more defined or the measurement is defining a position that can be verified, the resolution of those expensive toys might be worth the price but on a spherometer where you are less sure of the point where contact is made the expense could be better spent.
   
  Ken Hunter
   
  

Stan Truitt <s.truitt@verizon.net> wrote:
  Aloha Dominic-Luc,

Welcome to our side of the "Pond".


>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.

Perhaps, this site would be of interest:
http://www.newport.com/store/product.aspx?id=3210

I have purchased these for less than $20 and am very satisfied!

Or, for a real treat:
http://www.newport.com/store/product.aspx?id=3842
Though a bit pricey, these are exquisite and a pleasure to behold. 
They adjust with a precision and accuracy only, in my experience, 
improved upon with piezoelectric actuators. Dail-in interferometric 
precision out of the box.

I know it is not stock from which one would make his own adjuster, 
and they are first rate!


Regards,

Stan Truitt
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