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tech / rec.crafts.metalworking / New scales

SubjectAuthor
* New scalesSnag
`* Re: New scalesJim Wilkins
 `- Re: New scalesSnag

1
New scales

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From: Snag_one@msn.com (Snag)
Newsgroups: rec.crafts.metalworking
Subject: New scales
Date: Sat, 16 Mar 2024 20:06:02 -0500
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 by: Snag - Sun, 17 Mar 2024 01:06 UTC

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
"They may take our lives but
they'll never take our freedom."
William Wallace

Re: New scales

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From: muratlanne@gmail.com (Jim Wilkins)
Newsgroups: rec.crafts.metalworking
Subject: Re: New scales
Date: Sun, 17 Mar 2024 10:37:43 -0400
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 by: Jim Wilkins - Sun, 17 Mar 2024 14:37 UTC

"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

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

Re: New scales

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From: Snag_one@msn.com (Snag)
Newsgroups: rec.crafts.metalworking
Subject: Re: New scales
Date: Sun, 17 Mar 2024 10:29:14 -0500
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 by: Snag - Sun, 17 Mar 2024 15:29 UTC

On 3/17/2024 9:37 AM, Jim Wilkins wrote:

>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 .
--
Snag
"They may take our lives but
they'll never take our freedom."
William Wallace

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