The specigraph transfers tolerance from a Y to an X if the two are correlated.  For example, if the following situation should occur:

The result was measured according to operation time with the following resulting correlation:


The result tolerances were 41.25 +/- 0.75 and we want to know the tolerances to apply over the operation time to obtain compliant parts.

To do this, simply fill in the target Y (41.25) as well as the width of the tolerance interval (1.5) and we get :


The tolerance to be applied to X is 21 +/- 0.7.