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FARO® Knowledge Base

Issues That Can Degrade Accuracy with the FaroArm and Gage

Overview

Below are some issues issues that can degrade accuracy while measuring with the FaroArm:

Mounting

  • Do not mount to any type of wooden surface or do not mount to optical cables (as Vibraplanes), because the steel sheet on top of the tables is thin and deflects.
  • Folding tripods using the stabilizing struts are unstable.
  • Heavy-duty stands with wheels down and pins up are unstable.
  • Part deformation due to excessive clamping force.

Compensation

With Probes

  • Measuring with Point Probes.
  • Measuring with chipped, loose or cracked ball probes.
  • Measuring with probe extensions. The extensions will deflect.

With the Laser Line Probe

  • Do not drag the probe over the FARO Compensation Plate during the plane measurement. Lift the probe in between points to avoid scratching the surface of the plate.
  • Poor probe compensation technique. Do not do short sweeps with the FARO Laser Line Probe during compensation.
  • Dirty lens. Make sure to clean the top and bottom lenses with the cloth from the FARO Laser Line
  • Probe Case. Dirt and grease on either lens can cause poor results.

Measurement Environment

  • Measuring close to an end stop can induce unwanted stress.
  • Extending the arm out as far as it can go can cause unnecessary stress.
  • Or repositioning the device using the Move Device Position command.
  • Excessive vibration in the surrounding area can produce unwanted results.
  • Rapid changes in ambient temperature can cause errors in the arms automatic temperature compensation.
  • Measuring using poor techniques; minimum number of measured points per feature, moving while recording individual points and small coverage area.


Special Note: If the arm is mounted on granite table or cart, do not measure objects that are not mounted to the granite table or cart.