Chapter 4  Angular Measurements
Angular Position Measurements
Measurements Reference Guide 4-43
The bottom-screw mounting arrangement is required for any of the 
measurement optic whose housing does not have the hole configuration 
required for top-screw mounting.
Figure 4-23. Mounting the moveable optic in the measurement fixture
1
  Cap-head machine screw, M3 x 45 mm
2  Fixture top
 3  Moveable optic
4  Fixture base
5  Cap-head machine screw, M3 x 10 mm
                          *                              **
Mounting methods—use the appropriate one
* top-screw mounting—newer optics only
** bottom-screw mounting—older or newer optics
1
2
3
5
3
4