MDP-15
7. Maintenance
7-1. Adjustment of universal joint
Equipments required:
1. Dial indicator (1µm or 2µm resolution)
2. Magnet stand
3. Precision ground testing pin (Standard accessory:
Φ
1.0mm)
4. 1.5mm allen wrench (Standard accessory)
5. 5.5mm wrench (Standard accessory)
1) Preliminary check
a. Insert the testing pin into the collet.
Use a drill well that fits the pin and make sure that both the collet and the drill well
are free of any dirt.
b. Attach the dial indicator stand to the table.
Place the dial indicator 5 to 10mm from the collet.
c. Check the scale deflection.
Turn the drill and check for any deflection on the scale.
After turning the drill for one revolution, if the deflection is within 5µm, adjustment of inconcentricity
is not necessary.
d. Check Play
Even if the adjustment of inconcentricity is properly done, there may be a rare case that the universal
joints have play. Hold the universal joints at the motor side and the drill side with both hands and
see if there is play by moving it up, down, left and right. When there is play, you will know it
from the touch and sound. In this case, you need to tighten the bolt firmly. After that, check the
movement once again.
UNION TOOL
13
Drill well
Drill side
Motor side
Universal joint
Testing pin
Dial indicator
Motor
