On 2008-07-01, Paul Jeran wrote:


-- Has anyone ever used one of these?

http://www.use-enco.com/CGI/INSRIT?P...52293&PARTPG=I
NLMK32

I need to measure some parts that are 24" +/- .005 and don't have a
large enough vernier. Would it just be better to bite the bullet and
get a large vernier?

Hmm ... what you've pointed to *looks* (in the absence of real
specs) as though it will only make it out to 18" maximum.

Try looking on eBay for older large vernier calipers.

Or -- does your milling machine table have 24" of travel? If
so, you might be able to use a centering microscope to detect the ends
(and since both ends of the workpiece are likely to be beyond the worn
center of the leadscrew, if you are careful to approach both ends from
the same direction you can probably get a pretty good reading. Or -- if
you have a DRO (and that much travel), you can do it more easily.
You'll still need the centering microscope or some easy way to verify
where the ends of the workpiece really are. If they are machined
cleanly, just an edge finder should do it -- at the cost of needing an
extra 0.400" or so of travel.

Good Luck,
DoN.

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