JUKI AMB-289 Engineer's Manual page 21

Adjustment Procedures
1. Loosen four setscrews 1, lightly press Y top feed motor 2
in the direction of arrow mark, and tighten four setscrews 1
again, while moving the top feed unit to and fro and
confirming that it smoothly moves within the movable range.
2. Apply grease (green : grease tube) to lengthwise feed gear
section 3.
3. Place button gauge 5 in button chuck 4. Set button gauge
5 to the position where the center of button gauge almost
aligns with needle 6.
4. Turn ON the power, and confirm whether there is any
looseness after the origin retrieval.
5. For adjusting the origin position, refer to "3) Adjusting the
top feed origin sensor" of "(16) Adjusting the respective
sensors".
Results of improper Adjustment
™ When pressing is insufficient,
17
− −
backlash becomes large, and
pressing is excessive, torque
becomes large. Then step-out
may be caused.