To Create a Midplane Plane
By using the Midplane option, you can create a Constructed Plane midway between two planes. The reference planes can be at any angle to each other.
1. Click Inspect > Plane. The CMM Construct tab opens.
2. Select the parent reference Csys from the Parent Csys drop-down list.
3. Select Midplane from the Type drop-down list.
4. Select two measure or construct steps of type plane.
5. Select OK.