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Proper way to check parallelism...

ChairsWithWheels
I have a part that needs to be parallel within .0008" to datum 'A'

We cannot fixture datum A to the granite as it has a boss, we use three ground blocks to fixture the part on three points, then sweep with an indicator.

Old timey engineer says that is the wrong way to check it, and throws a pair of micrometers on it and gets .0005".

He's checking thickness correct? Not parallelism. At this point I don't know how else to explain it to engineering...
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  • The datum should be a perfect plane, tangent to the material on the free side of it.
    Sweeping with the indicator measure only the parallelism of the plane from a datum passing through the blocks, not the real datum (except if the blocks ha exactly the same height, and cover the whole surface)
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  • The datum should be a perfect plane, tangent to the material on the free side of it.
    Sweeping with the indicator measure only the parallelism of the plane from a datum passing through the blocks, not the real datum (except if the blocks ha exactly the same height, and cover the whole surface)
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