Straightness Measurement; Appendix F - Renishaw XM-60 multi-axis calibrator User Manual

XM multi-axis calibrator

Appendix F

Straightness measurement

Consider a tool machining a component on a machine bed. As the bed moves
from right-left, errors in the machine cause the height of the tool to vary above
the bed.
Error
To measure this effect we measure the height between the tool and the bed
at 'intervals' along the movement of the axis. The error is the variation from a
straight line.
Placing the launch unit on the bed of a machine the laser beam becomes the
reference. Variations in height are detected by the receiver as the machine moves
left-right.
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