Troubleshooting Strippit XP 1000 Y-Axis Homing Drift

The panel shows the Y axis at 39.00, but the table has stopped before the physical home sensor turns on. Start with the live home-input state, not backlash compensation: the controller’s coordinate and the machine’s reference have separated. Find whether the sensor circuit, feedback path, mechanical transmission, or homing sequence is losing the physical reference before you alter offsets.

Read the Symptom Before Changing Anything

The Strippit XP 1000 completes multiple runs, then fails during the return toward home. The reported Y coordinate still reaches 39.00, even though the home sensor is not actuated. The problem appears after roughly 50 runs and occurs on the homeward return rather than travel toward the turret.

Do not treat 39.00 as proof that the table is home. It proves only that the position value used by the control has reached that coordinate.

Separate Displayed Position From Physical Reference

A servo axis has at least three relevant states: commanded position, measured position, and physical machine position. The screen may show the command, the feedback-derived coordinate, or a processed machine coordinate. None independently proves that the home switch is active.

A correct reference cycle ties those states together at a repeatable physical event. The table moves into the reference region, the control detects the home input or other reference event, and the coordinate system is established from that event. If the control stops solely because its internal coordinate reached 39.00, an earlier error can remain hidden.

Direction matters. Clearance in a coupling, screw support, nut, belt, gear, or other fitted transmission component may be taken up differently after reversal. A loose coupling can also move normally under one load direction and slip during the homeward return. Feedback mounted on the motor can report rotation even when looseness downstream prevents equivalent table motion.

An intermittent sensor circuit creates a different failure. The flag may enter the sensing zone, but the control never receives the transition. Conversely, a stuck or forced input can tell the reference routine that home exists when the physical sensor is not active. Observe both the sensor indication and the controller input to separate these cases.

Start With the Home Input

This check comes first because it divides the fault quickly and does not disturb calibration.

1. Stop after the failure without changing offsets or cycling power. Record the displayed Y coordinate, physical table location, home-sensor indication, controller home-input state, and any status shown by the BRU 200 drive.
2. Jog the table away from home, then approach the sensor slowly under the machine’s approved service controls. Watch the sensor and the controller input at the same time.
3. If the sensor indication changes but the controller input does not, trace the sensor supply, connector, cable, terminals, and assigned input channel. Flex accessible cable sections gently while monitoring the input to expose an intermittent conductor.
4. If neither indication changes, inspect sensor alignment, target position, contamination, mounting security, and sensing gap. Test the device by the approved electrical method before replacing it.
5. If both indications change together, repeat the approach several times from the same direction. Measure the physical trip point with a dial indicator or other suitable reference and compare the spread with the machine’s required homing tolerance.

That is not the end of the check. If the input is repeatable but the table stops short during production returns, inspect the position and mechanics next.

Correct the Fault in a Controlled Sequence

1. Preserve the failed state. Photograph or record the screen, input state, drive status, and physical distance from the sensor. A power cycle may erase the condition that identifies the branch.
2. Isolate the machine before mechanical inspection. Follow the machine’s energy-isolation procedure. Check accessible couplings, keys, locking hardware, screw supports, thrust components, belts, gears, and feedback mounts where fitted.
3. Test reversal lost motion. Approach one measurable table position from each direction using the same indicated coordinate. A physical difference points to mechanical clearance, slip, or a feedback location that does not measure motion at the table.
4. Inspect feedback connections. Check encoder or position-feedback connectors and cables for looseness, contamination, damaged shielding, strain, or movement-related intermittency. Record drive diagnostics before reseating connectors with power safely removed.
5. Repair the proven fault. Correct the open or intermittent input circuit, secure the slipping component, repair the feedback connection, or replace the failed device identified by testing. Do not move the home target merely to make it meet an incorrectly positioned table.
6. Re-establish the machine reference. Run the documented Strippit XP 1000 reference procedure after the physical and electrical fault is corrected. Use the machine documentation to verify the intended relationship among the home input, physical table position, and displayed 39.00 coordinate.

Change one condition at a time. If you adjust compensation, move a sensor, and reseat feedback wiring together, you lose the evidence needed to identify the actual failure.

Prove the Repair Across Repeated Returns

A single successful home return proves very little because the reported fault develops after many runs. Test beyond the observed failure window.

1. Reference the machine and document the physical home position with a suitable measuring method.
2. Run repeated Y-axis moves with different travel distances, including moves toward the turret followed by returns home.
3. Continue for more than roughly 50 cycles, because that is where the fault was observed.
4. At defined intervals, compare the displayed 39.00 position, the physical reference measurement, the sensor indication, and the controller input.
5. Stop immediately if physical position begins drifting even though the display repeats. Capture the drive status and input states before resetting anything.

Acceptance requires physical repeatability within the machine’s specified tolerance, reliable home-input transitions, and no accumulating difference between table position and displayed position. Read the permitted tolerance from the machine service documentation; do not substitute screen resolution for positioning tolerance.

Avoid Fixes That Hide the Cause

• Do not begin with backlash compensation. Compensation cannot repair a dead input, loose coupling, intermittent feedback cable, or slipping transmission part.
• Do not trust the coordinate alone. A repeating display value can coexist with a changing physical position.
• Do not relocate the sensor target to meet the stopped table. That converts an unexplained position error into a false reference and can shift every downstream coordinate.
• Do not replace the BRU 200 drive solely because the axis position is wrong. First compare drive feedback behavior with actual table motion and inspect the complete mechanical and sensor paths.
• Do not power-cycle before collecting diagnostics. Record displayed position, input state, physical sensor state, and drive status while the mismatch is present.
• Do not validate with one short move. Repeat the travel pattern and exceed the roughly 50-run failure window.

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