Ned Simmons may or may not have intoned:
On Fri, 9 Oct 2009 17:39:53 +0100, AdeV
wrote:

AdeV may or may not have intoned:

...as it read 0.096" for one complete turn ...
...A second turn yielded 0.184"

Duh, brain fart. 0.192" for 2nd rev, 0.288" 3rd, and so on.

No idea where .184" came from

Are you sure the scale is perfectly parallel to the ways? A 2 degree
mounting error would explain the discrepancy.

I'm pretty sure it is: The mounting brackets (shown on the pic I linked
to earlier) are exactly in line with the edge of the knee. If my trig is
about right, then over 24" I'd expect to see roughly 0.8" of
misalignment for 2 degrees? In fact, the scale is significantly longer
than 24", it has nearly 30" of usable measure, but either way, if
there's more than 0.050" difference between the top & bottom of the
scale, I'd be very surprised.

BTW, I've used several identical-looking scales from www.shars.com
with no problems (even after calibrating their length with a hacksaw)
other than the cheap batteries supplied.
http://www.shars.com/products/view/2..._Machine_Scale

It could be a duff unit, then.... I just wanted to make sure I'd not
done something stupid; or that they were this inaccurate in general...

--
Cheers!
Ade.