MachineryFix

Problems We Solve · CNC & Motion

Machine losing position or failing to home?

Likely causes, what our technicians check onsite, and how to get it fixed — verified engineers across India, onsite in hours (under 4 in Hyderabad), 24/7.

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01 / Overview

Machine Losing Position / Homing Fault

A machine that won't home, loses its reference, or drifts off position between cycles has a feedback, reference-switch or compensation problem. It's disruptive and can be unsafe, but it's a well-bounded fault once you check the homing chain and the feedback in the right order.

We diagnose homing and position-loss faults on CNC, servo and motion systems — checking reference switches, absolute-encoder data, backlash and the homing sequence itself, and restoring reliable referencing.

02 / Diagnosis

Likely causes

The handful of things that actually cause this — in the order we rule them out.

DX_01

Absolute-encoder data lost

A flat encoder-backup battery or a feedback fault loses absolute position, so the axis can't hold its reference across power cycles. We restore the data and fit a fresh battery.

DX_02

Home / reference switch fault

A failed, misaligned or dirty home switch (or proximity sensor) makes the homing sequence fail or reference to the wrong point. Common and easily missed.

DX_03

Feedback fault

A slipping coupling, a failing encoder or an intermittent feedback cable lets the axis lose count so real position no longer matches commanded position.

DX_04

Backlash / mechanical slip

Worn ballscrew, a loose coupling or backlash lets the axis physically move without feedback registering it, so position drifts over cycles.

DX_05

Homing parameters / sequence

Wrong homing direction, speed or offset parameters after a reset or replacement make the machine reference incorrectly even when the hardware is fine.

03 / Onsite

What our technician checks

A methodical path to root cause — not a scattergun of part swaps.

  1. 01Check absolute-encoder battery and restore position data
  2. 02Test and align the home/reference switch or proximity sensor
  3. 03Verify feedback integrity and coupling security
  4. 04Measure backlash and mechanical lost motion
  5. 05Review homing sequence, direction and offset parameters

04 / Fix it

Related services

The services that resolve this fault.

CNC Controller RepairServo Drive RepairMotion Control & Servo TuningFANUC CNC Repair

05 / Questions

Frequently asked questions

The machine won't complete its homing sequence. What's wrong?+
A failed homing sequence is usually a home/reference switch that's dead, misaligned or dirty, or wrong homing parameters after a reset. We test and align the reference switch and verify the homing direction/offset — that resolves the large majority of homing faults.
The axis loses position between cycles even though nothing looks wrong. Why?+
That points at a feedback or mechanical-slip problem — a slipping coupling, an intermittent encoder/cable, or an absolute-encoder battery losing reference. We check the coupling, feedback and encoder battery, since a healthy-looking axis can still be losing count.

Written & reviewed by MachineryFix Engineering Team — last reviewed — questions? Call +91 70751 47888

Machine Losing Position / Homing Fault? Get a technician onsite.

Describe the fault and we'll match a verified specialist near you — onsite in hours across India, under 4 in Hyderabad. 24/7.

Book a TechnicianCall +91 70751 47888