New scales

[Snag]

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 ?

[Jim Wilkins]

"Snag" wrote in message news:ut5fl9$35s5e$***@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]

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

I don't know what's inside those scales ... I just know that they're
supposed to be much better than the capacitive scales I was using with
the old unit . And more expensive too and I don't want to take a chance
on breaking one .