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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: New scales
Date: Sun, 17 Mar 2024 10:37:43 -0400
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"Snag"  wrote in message news:ut5fl9$35s5e$1@dont-email.me... 

   The box says "linear grating scale" , I assume these are the "glass 
scales" everyone thinks so highly of - supposed to be .0002" sensitivity 
.. Anyway . I'm wondering what the tolerance for lateral/up-down movement 
is with these . X and Y are no problem , but the only reasonable place 
to attach the read head on the spindle has about .050-.060" rotation . I 
have already designed a guide bushing device to prevent the rotation , 
but I just got to wondering . How sensitive are these scales ?
-- 
Snag

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In optics a grating is evenly spaced parallel lines, not a 2-way grid.