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Flatness: How To?

We are doing a short run project for a company. We are a stamping factory. They want to stamp out a flat "V" shaped retention spring out of 0.018" thick steel and measure 0.010" flatness, unrestrained. I usually deal with material that is thicker than this. Anyone have any ideas?

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  • You can measure anything on a CMM! BUT it may not give you accurate and/or repeatable data.

    My vote would not be for using a CMM for this and as suggested above, an optical comparator for just 30 piece would be the better choice of tools
  • Based on my assumption on the size (OP & sketch shows .018" thick so it can't be much larger that 1/2" squared) you would simply zero on the highest point on the top side of the part and look for the lowest point on the top side of the part. One could assume that could be done by simply changing the focus (our Starrett comparators will move almost 3" for adjusting the focus) to see the whole part
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  • Based on my assumption on the size (OP & sketch shows .018" thick so it can't be much larger that 1/2" squared) you would simply zero on the highest point on the top side of the part and look for the lowest point on the top side of the part. One could assume that could be done by simply changing the focus (our Starrett comparators will move almost 3" for adjusting the focus) to see the whole part
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