FaroArm
®
Manual
January 2009
53
Chapter 1: Introduction to the FaroArm
®
The deformations must not exceed the deformation reported at
certification.
In general, the excessive translation deformations are added directly to
the certified accuracy, while the excessive angular deformations of the
base affect accuracy as a more complicated trigonometric function of
the length of the reach.
Temperature Considerations
FARO was awarded the U.S. patent #5,402,582, and worldwide patents
are pending, on the concept and the methods for temperature
compensation of portable CMM devices. This brief overview is meant
only as the most general of descriptions.
To maintain certified accuracy in a multitude of environments, the
monitoring of temperature and the rate of temperature change is
required. Only the FaroArm employs a software/hardware solution
where a semiconductor temperature sensor is built into each joint.
The temperature is continuously monitored and the difference over time
is then applied to the mathematical formulas or kinematics, which
define the position of the Arm in three-dimensional space. Link length
corrections are made constantly by the inboard processor, which adjusts
Forces Encountered due to
Counterbalancing
Displacement due to Force
Rotation due to Torque
FY
Y
M
Y
Mx
Moments (about X)
XF
X Forces (along X)
M
Z
Z
F
Z
Force
Displacement
due to Force
D
L
D
D
Rotation due to Torque
L
T
08M46E00_FaroArmUSB.book Page 53 Tuesday, February 17, 2009 1:42 PM
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