Point 1 / +6,-20
Point 2 / +5,-10
Point 3 / +10,-2


If tolerance on drawing , limit 30
It can use , Because this work piece is limit +10 (oversize), -20(lowersize) = 10 + 20 = 30 .

But . . .
If tolerance on drawing , limit 20
It can't use .

How to this, it same How to circularity .

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Circularity measure 1 point .

Such as , Point 1 / +6,-20

If tolerance on drawing , limit 30
It can use , Because this work piece is limit +6 (oversize), -20(lowersize) = 6 + 20 = 26 .

If tolerance on drawing , limit 25
It can't use .

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