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11-35
Chapter 11 FXYBX/SXYBX
8-5-2 Replenishing grease to the ball screw (ZF)
The ZF uses a ball screw for drive. Grease must be periodically replenished to the
ball screw. Refer to section 8-6. for details on replenishing grease to the ZS/ZRS
unit ball screw. Select the grease from the following recommended types.
Recommended grease : Alvania No. 2 (Showa Shell)
Daphne Eponex No. 2 (Idemitsu)
!
CAUTION
When designated by YAMAHA and the user, special grease, such as splatter-
proof grease, may be applied when the robot is delivered. In this case, apply
the appropriate grease as indicated in the delivery specification drawings, etc.
!
CAUTION
Always remove the grease nipple after completing the work. Damage or
positional deviation could occur if the robot is operated with the grease nipple
installed.
1) Prepare the following recommended grease nipple beforehand.
Recommended grease nipple : A-M6X1 type (JIS B1575)
2) Turn the controller power OFF.
NOTE
The replenishment work can be carried out easier by moving the Z-axis slider to
near the motor (near the origin) and turning the controller power OFF.
3) Place a sign indicating “Work In Progress” so that other operators do not turn
the controller power ON.
4) Remove the axis stroke cover when replenishing grease. (Refer to
"1. Installation" for details on removing the cover.)
5) Install the grease nipple onto the ball screw flange.
6) Replenish the grease from the grease nipple using the grease gun.
Sufficient grease has been replenished when new grease starts to seep out
from the clearance between the ball screw nut and screw. Wipe off any exces-
sive grease.
Recommended grease gun : MG70 (THK) N-type nozzle
7) Remove the grease nipple.