Faro FaroArm P08, Руководство пользователя

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FaroArm User Guide
January 2007
20
Chapter 1: Introduction to the FaroArm
N
OTE
: To maintain this accuracy, correctly mounting the FaroArm
is very important. See “Hardware Setup” on page 5 for procedures
on mounting the FaroArm.
Loss of a Degree of Freedom
In a working volume of the FaroArm there can be a loss of a degree of
freedom (natural rotation of transfer case). With this loss, temporary
bending occurs on the transfer tubes of the FaroArm causing a
movement of the probe position that cannot be recorded by the Arm’s
encoder system. Measurement results taken in these positions are not
accurate. This condition is never encountered in the calibration of the
FaroArm.
Common areas of measurement where this loss occurs are:
• when an encoder has reached a hard end-stop
• directly above the FaroArm
• in close to the base of the FaroArm
The FaroArm should always feel fluid in its movement. If excessive
force is needed to move to a measuring location, a degree of freedom
has probably been lost. The following figures illustrate some of the
possible positions of a FaroArm where a degree of freedom has been
lost.
Figure 1-13 Loss of a Degree of Freedom
08M46E00_FaroArmUSB.book Page 20 Monday, January 15, 2007 1:12 PM