FARO Edge
September 2012
76
Chapter 5: Accuracy
• Damage to the encoder-bearing interface joints (where tubes, bearings and
encoders are mated).
• Failure of the encoder-electronics system (changes motion into electrical data).
• Excessive impact with another object or an end-stop. The impact may cause
the transfer cases to bend, the joint housings to deform, or the encoder-bearing
interface pin system to loosen.
Any of these problems require FARO’s Customer Service Department to
disassemble the Edge, repair the necessary item(s), and perform a factory
compensation. A factory compensation is necessary since the physical nature of
the Edge has been changed.
Edge Calibration
The Edge software has commands that allow you to perform tests that certify the
accuracy and repeatability of your Edge. The calibration commands allow you to
test the Edge using a holes, a ball bar, or a step gauge.
The values measured in all of these calibrations include 100% of the measured
points. We will always refer to this as the “Max. minus Min. over Two,” or the
Maximum measurement subtracting from the Minimum measurement divided by
two (Max.-Min.)/2.
If any test fails, print the results and repeat the calibration two more times. Print
all of the results and contact FARO’s Customer Service by Phone, Fax or E-Mail.
See “Technical Support” on page 191.
Repeatability
Perform the single point repeatability test to check the probe and repeatability
using a hole or a cone. You must use a firmly secured object with a hole at least
1mm smaller than the ball probe. If a cone hole is used, extreme care must be
taken to ensure that the probe is seated at each “measurement.”
• Use a calibrated ball probe. See “Installing Probes” on page 53 and
“Compensate Probe” on page 181.
• Run the Single Point Articulation Test (SPAT). See “Single Point Articulation
Test (SPAT)” on page 94.
Volumetric Accuracy
Perform a Sphere to Sphere, Point to Point, or Plane to Plane length measurement
in order to certify the volumetric accuracy of the equipment. This should be done
using traceable length artifacts, which are measured at various locations and
08M52E00_FaroArm_Edge.book Page 76 Thursday, October 4, 2012 9:31 AM
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