Chapter 6  Squareness Measurements in a Horizontal Plane
Mounting and Aligning the Optical Square and Interferometer for the 
First Axis Measurement
6-10 Measurements Reference Guide
Mounting and Aligning the Optical Square 
and Interferometer for the First Axis 
Measurement
If your machine has a vertical spindle, continue with the instructions in 
the next section, “Mounting and aligning optics on a machine with a 
vertical spindle.” 
If your machine has a horizontal spindle, go directly to the instructions in 
“Mounting and aligning optics on a machine with a horizontal spindle” in 
this chapter.
Mounting and aligning optics on a machine with a 
vertical spindle 
This section explains how to assemble, mount, and align the optical 
square and interferometer on a machine with a vertical spindle.
Mounting the optics 
To assemble the optical square and interferometer and mount them on the 
machine, follow these steps:
1 Attach the optical square to its mount using the attachment screw 
(Figure 6-6).