(E) 7-19
7. Operation Method
LH71A / LH72
1. Cautions
• Before use, be sure to turn the steel ball with the fingers about the axis of the shaft 2 or 3 times both
clockwise and counterclockwise so that the steel ball rests properly on the end of the shaft.
If this not done, the rust-preventive grease between the steel ball and shaft might cause a detection error.
• Do not turn the steel ball more than 180º in either direction since a spring is connected to it.
• Do not pull the steel ball and let it spring back sharply against the end of the shaft.
• Fix the shank to the main spindle in such a way that the shank is not inclined against the axis of the
spindle, since inclination of the shank will cause errors in the measurement.
• For more precise positioning at the center of the workpiece: Touch the workpiece with the feeler ball q.
Then, move the touch sensor to the other side of the workpiece, rotate the shank holder of the machine
through 180º and then touch the workpiece w. Half the measured value is the center of the workpiece.
Spring
Dust cover
Workpiece
Axis of spindle
Axis of spindle
Center
Rotate the shank holder of the machine
through 180° and then touch the workpiece.
Steel ball
Shaft
Give a 180º turn 2 to 3 times
(No more than 180º)
q w
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