Chapter 5  Straightness Measurements
Introduction
5-2 Measurements Reference Guide
Introduction
This chapter explains how to make straightness measurements that allow 
you to determine if a machine’s moveable part is moving along a straight 
path. Before performing the procedures described in this chapter, you 
must fully understand and know how to perform the procedures presented 
in the Agilent 5530 Getting Started Guide. For operating specifications for 
straightness measurement optics, see Appendix A.
Straightness and squareness measurements are usually done together, 
since a squareness measurement is actually two straightness 
measurements perpendicular to each other.
The procedures in this chapter explain how to make straightness 
measurements only. Follow them in the event that you are not going to 
combine straightness and squareness measurements.
If you plan to make straightness and squareness measurements, you can 
perform the straightness measurements as part of a squareness 
measurement. Depending on whether your measurements are in a 
horizontal or vertical plane, go to either Chapter 6, “Squareness 
Measurements in a Horizontal Plane,” or Chapter 7, “Squareness 
Measurements in a Vertical Plane.”
Figure 5-1 shows the required hardware for straightness measurements.