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Re: [Phys-l] Another uncertainties question...



This reminds me of specification in mechanical drawings I've seen
(and written), e.g. 2.010 " +0, -.002 Why not 2.009 +/- 0.001?

Another reason is, for example, to have a nominal 2.01 peg fit in a
nominal 2.01 hole. The hole might be 2.01 +0.02/-0.00 and the peg might
be 2.01 +0/-0.01. (I've even heard of specs like 2.01 -0.01/-0.03 in
such cases!)

This way you can tell your machinist make a "2.01 inch peg" and have it
fit in a "2.01 inch hole". I don't know that it is the best way to
handle the situation, but it is one solution!


Tim Folkerts