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Author: rorschach
Time: 08/21/03 12:26 PST
This is a reply to message no. 11930 by rorschach
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geometric tolerancing
oops, I forgot to mention in the second example that the callout would be true position (symbol is a circle with cross hairs in it) and the callout would look like this:  !symbol!!A!B!C!D! where datum A would be the cylinder head mounting face, Datum B would be the secondary datum from the first bore, Datum C the tertiary datum of the first bore, and datum D would be the first bore itself. This gives you a target cylinder .xxx in diameter down the theoretical center of the second bore wherein the axis mush remain for the entire length of the bore. It can theoretically corkscrew anywhere it wants as long as it stays in that target diameter.
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