Measuring straightness
Measuring straightness
(OP)
I have a straight edge approximately 38mm long by 20mm wide and 1mm thick. The straight edge is bevelled both sides and is believed to be better than +/- 3 microns for straightness (overall).
Can anyone suggest how to measure the straightness to substantially better than 1 micron both for the overall length and over shorter distances of approximately 3mm?
Can anyone suggest how to measure the straightness to substantially better than 1 micron both for the overall length and over shorter distances of approximately 3mm?





RE: Measuring straightness
Cyril Guichard
Mechanical Engineer Consultant
France
RE: Measuring straightness
RE: Measuring straightness
These are the agencies responsible for maintaining the "standard" units for length, weights, volumnes, etc.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Measuring straightness
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Don't remember if Wyko makes a physical contact profilometer, though.
TTFN
RE: Measuring straightness
A distance-measuring interfereometer (DMI) with straightness optics could perhaps suffice, something like a Renishaw ML10. You'd have to work out a way to guide it.
If you're using it as a straightness reference for metrology in a horizontal plane, you can always use straightedge reversal to null the straightedge error, so it would already be good enough
RE: Measuring straightness
RE: Measuring straightness
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring straightness
TTFN
RE: Measuring straightness
Well, true being straight means in the absence of high gravitational field, which I think you would qualify.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada