15
2 Setup
No. 99MBC122A
2.5
Checking the Spindle Condition
A high-precision linear ball bearing is used for the spindle guide of the LGH gage head. Therefore if
the spindle is pushed in for a long time, or if the LGH gage head is used for a long time, the contact
will not return to the normal bottom dead center.
If the contact point becomes not to reach the reference plane or measuring surface or the display
value becomes unstable, make sure the spindle condition by the following procedrue.
Tips
The cause is the misalignment of the retainer of the linear ball bearing. This phenomenon is inevitable due to
the structure.
In this document, this is called a "retainer misalignment".
Procedure for checking and correcting retainer misalignment
Check the retainer misalignment after power-on and before thermal stabilization.
1
Turn on the power switch on the back of the counter.
» The counter enters the stand-by state.
2
With the contact point free, press [A_ZERO] or [B_ZERO] on the counter.
» The Ach (upper display) or Bch (lower display) is set to zero.
3
Lightly and slowly push in the contact point by hand until it stops, and check the counter reading.
Tips
The retainer is normal when the counter reading is 10.5 mm or more.
4
If the counter reading is less than 10.5 mm, retainer misalignment has occurred. Slowly pull the tip of
the contact point.
» The retracted spindle is pulled out, which corrects the retainer misalignment.
Pull out the spindle to the end position where the movement stops. Be careful not to apply excessive force when
pulling out the spindle. Also, avoid turning force on the spindle.
Tips
The pull force should be around 5 N.
5
Perform steps 1 to 3 to check for retainer misalignment.
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