Machine's spindle wear can greatly impact the accuracy and the finish of the produced parts. A worn-down spindle can lead to eccentricities and out of tolerance parts and can even break or damage the clamped tools. It thus becomes essential to regularly check the health of these spindles.
Alignment test bars can be used to inspect the female taper of the lathe's spindle, spindle's parallelism to the saddle's movement and the alignment of the tailstock with the headstock. Poorly aligned centres can lead to unintentional tapers across the length of the workpiece.
A runout test arbor is used along with the dial gauge to measure any axial or radial runout transferred by the worn-down spindle of the milling machine.
Both the test bars tell us about the overall health and accuracy of the machine spindles thus preventing tool breakage, improving work finish and maintaining tight tolerances.