Your machine's capability to position the tool to the workpiece is everything. SpindleCheck measures four positioning factors of your machine tool.
How long does the machine take to stabilize when it's first started? How far does it move?
How much tool movement is from vibration? What are the vibration sources?
How accurately can the tool repeat a position? Which axis is worst?
Is the tool moving with chiller cycling or other thermal factors?
When cutting, the rotational accuracy of the spindle is a significant factor in determining the quality of the finished part.
When roundness is critical, know what you're machine is capable of.
Surface Roughness Capabilities
Know which machine, which speeds, and which axes provide the best surface finish.
Position Shift with RPM
Do you know how much the tool position shifts when you change speeds? It's not zero.
Do you know what the spindle is doing at operating speeds? You can't measure that with a dial indicator.
Total Rotational Error
Do you know the health of your rotary axis? Total Rotation Error measurements give a picture.