Measured Line button
With the Line button, you can measure the orientation and linearity of a line that belongs to a plane aligned with a reference plane or a line in space. To create a measured line, you must take two hits on the part.
Measured Lines and Workplanes
When PC-DMIS creates a measured line, it expects the hits for the line to be taken at a vector perpendicular to the current workplane.
If your current workplane is ZPLUS (with a vector 0,0,1),
and you have a block-like part, the hits for the measured line must be
on a vertical wall of that part, such as the front or side.
If you then wanted to measure a line feature on the top surface of the
part, you would need to switch the workplane to XPLUS, XMINUS, YPLUS,
or YMINUS, depending on the direction of the line.