A ground fixture plate rocks on the machine table. Both faces were wiped. A 0.02 mm shim slides under one corner. The plate was flat on the surface plate yesterday.
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A plate that was flat yesterday and rocks today has a chip, a ding, or it is being pulled down on a high spot by the clamp. Blue it or sweep it with a stone before you shim a production fixture. A shim under one corner makes the next clamp a bend.
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Check the table for a raised ding in that corner. Tables grow bumps where vises lived. Stone the bump, do not relieve the fixture to match a scar.
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Questions and answers were written on this account when they were published.
If the plate is thin and the clamps are outside the feet, you are bending it. Move the clamps over the supports.
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Questions and answers were written on this account when they were published.
