How to properly measure serrations on hardware

John Predmore

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#11
The strobe light can assess the equally spaced aspect, but without a measurement of width, per se. There is a tolerance on width.

A novel idea I had was to lay the part on a photocopier and measure the width of the serrations with a ruler from the photocopy. That is a poor man's optical comparator as long as the part lies flat. You would have to validate the method for any distortion that might be introduced by the copier, I was merely trying to speed things up by thinking outside the box. If you can't get enough precision with a ruler, maybe you have a toolmaker's microscope.

I suppose you could assess the equally spaced call-out by numbering the 16 wedges, cutting them out from the photocopy, and stacking them up.

There is also a tolerance on the height of the serrations. I don't think anyone yet proposed a method to measure the height....
 
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Tidge

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#12
The strobe light can assess the equally spaced aspect, but without a measurement of width, per se. There is a tolerance on width.
Which is why I suggested this as a go/no-go method for examining outputs. I completely believe that an optical comparator can make a reliable measure of ONE of the serrations on the disc. I have a suspicion that the most important feature of this part is the even spacing of evenly made edges, but I'm not the designer of the part.

The most annoying feature of the timing-light approach would be IMO if one of the serrations was misaligned/malformed, it becomes necessary to closely study each one to find the culprit.
 
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