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Okuma OSP Controller
Tool · Intermediate
Okuma OSP Alarm A 1521 - NC tailstock error
An error occurred in the NC tailstock. Code 1 indicates a spring stopper came off during movement in the low thrust mode, which means the tailstock lost its positioning reference while moving under low thrust.
1521
Okuma OSP Alarm A 1521 - NC tailstock error
NC tailstock error
An error occurred in the NC tailstock. Code 1 indicates a spring stopper came off during movement in the low thrust mode, which means the tailstock lost its positioning reference while moving under low thrust.
Common Causes
- Spring stopper failure in the low thrust specification tailstock
- Mechanical obstruction during tailstock movement in low thrust mode
- Worn or damaged spring stopper mechanism
Troubleshooting Steps
- 1Read the code number shown with the alarm: code 1 = Spring stopper came off during movement in low thrust mode
- 2Read the code: 1 means the spring stopper disengaged while the tailstock was moving in low thrust mode.
- 3Move the tailstock to a safe position and inspect the spring stopper mechanism for the low thrust spec; the manual lists a spring stopper failure as the probable faulty location.
- 4Check the operation of the spring stopper as the manual directs: verify it engages and releases cleanly through the tailstock stroke.
- 5Look for chips, hardened coolant, or mechanical damage that would let the stopper come off during movement.
- 6Repair or replace the spring stopper mechanism, then test tailstock movement in low thrust mode through the full stroke.
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Seeing another alarm with this one? Enter the code.
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