Faro Gage - Temperature Considerations

FARO Gage
May 2011
37
Chapter 6: Maintenance and Troubleshooting
and can be measured. The deformations must not exceed the deformation
reported at certification.
In general, the excessive translation deformation 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. The Gage employs a
software/hardware solution (patents pending) where a semiconductor
temperature sensor is built into each joint.
The temperature measured is compared to the reference temperature stored on the
on board EEPROM (Electrically erasable programmable read-only memory).
The difference in temperature is then applied to the mathematical formulas or
kinematics, which defines the position of the Arm in three-dimensional space.
Link length corrections are made constantly by the inboard processor, which
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
08M47E00_FAROGage.book Page 37 Wednesday, June 8, 2011 4:12 PM