User Manual

5-33
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Jackshaft
One of the biggest advantages in using a laser system is the ability to align
over long distances (> 20”). The further apart the sensor heads are
mounted, the less practical it is to use the Offset and Angle Tolerances. In
those cases, the Jackshaft Tolerances should be used. This method measures
the two angles (α and ß) as shown in the figure below. The combination of
these two angles are laid out on a graph similar to the offset and angle
graphic. When the angles are within tolerance, the cursor will be in the
Excellent or Acceptable range.
CSI’s recommended tolerances are listed in the following table.
3
Speed
(RPM)
Excellent Acceptable
Angle
(mils/inch)
Angle
(mils/inch)
< 500 1.0 2.0
500 - 1250 0.9 1.8
1250 - 2000 0.8 1.6
2000 - 3500 0.6 1.2
3500 - 7000 0.4 0.6
> 7000 0.2 0.3
ß
α