A gear made from granite


A Word About "Accuracy"


Positioning accuracy

The accuracy of the X-Y motion over a specific range:
  • Static—measured with nozzle stopped.
  • Dynamic—measured with nozzle in motion.

 Part accuracy

 The overall accuracy of the finished part. Affected by:
  • Dynamic positioning accuracy.
  • Relative motion between the X-Y axis assembly and the material support table.
  • Relative motion between the material support table and the material being cut.
  • Cutting tool offset value input by operator.
  • Effect of cutting speed variation on width of cut (kerf).
  • Cut Quality and Machinability Index selected by operator.
  • Taper caused by nozzle condition and/or nozzle standoff and/or cutting speed.
  • Z-Axis non-perpendicularity.
Repeatability

The consistency of the X-Y motion.


Part Repeatability

The consistency among parts. Affected by:
  • X-Y motion repeatability.
  • Relative motion between the X-Y axis assembly and the material support table.
  • Relative motion between the material support table and the material being cut.
  • Jet growth caused by nozzle wear.
  • Change in taper caused by nozzle wear or changing standoff.



 

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