The typical
approach to inspecting a feature such as the n1.000 hole
is to measure the size, calculate a bonus and then try
to locate the axis of the hole to see if it is within
the allowable position tolerance. Another approach is to
inspect the size and make measurements to see if the
hole violates the inner boundary (virtual condition). If
a hard gage were produced to inspect the position of
this hole, it would have a pin n.970 (+gage tolerance
and wear allowance) located at the basic location from
the datums.
This hard gage may
be simulated using a height gage in an open setup or CMM
probe. By adding and subtracting half the virtual
condition from the basic dimensions, the distance from
the datums that may not be violated may be calculated.
These distances may be easily
inspected.