Monday to Saturday - 8:00 -18:00 (CET/CEST)
Okuma Axis Drive & Feed System Repair
Ball screw and linear guide repair, backlash diagnosis and feedback verification — the mechanical-electrical link between a drive command and where the axis actually ends up.
Photo coming soon
What Is Axis Drive & Feed System Repair?
The servo drive tells the motor how much to turn; the feed system is what actually converts that rotation into precise linear position — the ball screw, the linear guide, and the feedback that confirms where the axis really ended up. When positioning accuracy drifts, surface finish degrades, or an axis seems to hesitate on direction changes, the cause is often here rather than in the drive electronics themselves.
Ball screws wear over time: backlash increases, friction goes up, and the CNC control's backlash compensation can mask that wear for a while, but compensation doesn't fix a worn screw — it just adjusts the target position to account for the play. Eventually the wear exceeds what compensation can reasonably correct, and the screw needs repair or replacement. On more precise setups, a linear scale mounted directly to the moving table gives true mechanical position feedback independent of the ball screw entirely, in what's called a dual-loop configuration — and when that feedback disagrees with the motor-side encoder, that mismatch itself is diagnostic information.
We are an independent repair company. We are not an authorized Okuma dealer, distributor or service partner — we repair Okuma axis feed systems on customer-owned equipment.
This service sits between two others we offer: if the actual fault turns out to be in the servo drive electronics rather than the mechanical feed system, see Drive Units Repair; if it's a control-side feedback or parameter issue, see Testing & Diagnostics first to help isolate which one you're actually dealing with.
Diagnosis at a Glance
A quick way to check whether your symptom points to the feed system rather than the drive or control.
Signs You Need This Service
Any of these usually point to the mechanical feed system rather than the drive electronics.
- Positioning error growing over time
- Surface finish degrading, especially on direction changes
- Backlash compensation values maxed out and still inaccurate
- Axis "catches up" noticeably after reversing direction
- Linear scale and motor encoder feedback disagree
- Increased noise or friction feel when jogging the axis
What We Repair
The mechanical and feedback components that make up the feed system.
- Ball screws and recirculating ball nuts
- Linear guides and bearing blocks
- Linear scales and rotary encoders
- Backlash measurement and compensation tuning
- Dual-loop feedback diagnosis
- Axis alignment and repeatability testing
Feed system work covers machines across every OSP generation — from legacy floppy-disk-era controls through the current OSP-P500. See our OSP controls guide for generation-specific detail.
What This Repair Covers
The specific parts of the feed system we work on, and what each one is responsible for.
Ball Screw Repair & Replacement
Cleaning, inspection and replacement when wear has exceeded what compensation can mask.
Linear Guide Service
Cleaning and alignment of the rails and bearing blocks that carry the axis load.
Backlash Measurement & Tuning
Real measurement of actual backlash, not just adjusting compensation numbers blind.
Linear Scale & Encoder Repair
Feedback devices that confirm true axis position, independent of motor rotation.
Dual-Loop Feedback Diagnosis
Investigates disagreement between motor-side and load-side feedback signals.
Positioning & Repeatability Test
Confirms the repaired axis actually holds tolerance, not just that it moves.
Why Backlash Compensation Isn't a Fix
Every CNC control has backlash compensation parameters, and it's tempting to treat a growing backlash number as something you just keep adjusting. But compensation only offsets the target position to account for known play — it doesn't reduce the actual mechanical play in the ball screw, and it doesn't improve as the screw keeps wearing. You can compensate right up until the wear exceeds what any reasonable offset can correct, and at that point, you cannot make accurate parts regardless of the settings.
The real question isn't "what's the compensation value now" but "how has it changed over time, and is the screw itself still within tolerance." We measure actual backlash rather than just reading the current compensation setting, because a compensation value alone tells you what's been masked, not what condition the mechanism is actually in.
When a screw or guide genuinely needs replacement, we'll tell you that directly. Continuing to compensate past that point just means degrading part quality until someone notices.
Photo coming soon
What Makes Our Feed System Repair Different
A few things that shape how we approach every axis, regardless of which symptom brought it to our attention.
Measured, Not Estimated
Actual backlash measurement, not just reading whatever compensation value is currently set.
Feed System vs Drive vs Control
We help isolate whether the real cause is mechanical, electrical or in the control, before recommending repair.
Honest About Replacement
If a screw or guide is beyond what a repair can fix, we say so rather than tune compensation indefinitely.
OSP Controls We Work Alongside
Feed system diagnosis relies on the control's backlash and feedback parameters, which vary somewhat by generation. Find your specific generation below.
OSP-3000
Legacy LC series — tape and floppy-disk era controls.
OSP-5000LB/LC series — floppy disk and bubble memory era.
OSP-7000Cadet/Crown/early LB — full-size CRT-era displays.
OSP-U100LU/MX-V/MC-V/MA-V — transitional floppy-to-CF generation.
OSP-E100Last pre-THINC generation — no USB or Ethernet.
OSP-P100First P-series — open-architecture Windows-based control.
OSP-P200THINC-OSP global rollout — API and networking introduced.
OSP-P300Shared database, touchscreen — most common current-era control.
OSP-P500Current generation — Digital Twin, dual-core processing.
Okuma Models We Support
Feed system configuration varies by machine family and axis count. Here are the model families we see most often.
LB & GENOS L
Lathes for shafts, gears and turned components.
GENOS M / MB & MAMachining centers for milled and prismatic parts.
MULTUS Mill-TurnMultitasking platforms machining complex parts in one setup.
MU-Series 5-AxisFive-axis centers for complex geometry and tight tolerances.
MCR Double-ColumnLarge-part machines for big, rigid workpieces.
MA-H HorizontalHorizontal centers built for long unattended runs.
Other Ways We Can Help
Feed system repair is one part of what we do — here's the rest of the site if a different problem fits your situation better.
Drive Units Repair
Component-level repair for VAC, MIV, MFU and BLD servo and spindle drives.
Testing & Diagnostics
Alarm code analysis and fault isolation before any repair decision is made.
Machine Calibration
Precision calibration once mechanical repairs are complete.
Every Component We Repair
Browse the complete catalog of boards, drives and modules we repair.
Spare Electronics
Tested, already-rebuilt spare units ready to ship when a fast swap beats a repair wait.
Industries We Serve
Automotive, aerospace, medical, defense and more — see how we support your sector.
Countries We Serve
See every country where we currently offer on-site technician visits.
All Services
Browse every repair and support service we offer, all in one place.
How This Repair Works
Three steps from a positioning problem to an axis that holds tolerance again.
01
Describe the Symptom
Machine model, which axis, and what you're seeing — positioning error, finish issues, or noise.
02
Measure & Isolate
We measure actual backlash and feedback behavior to confirm the real cause before repair.
03
Repair & Verify
Repair or replacement as needed, then positioning and repeatability testing before it's back in service.
Frequently Asked Questions
No. We are an independent repair company, not an authorized Okuma dealer, distributor or service partner. We repair Okuma axis feed systems on customer-owned equipment.
You can, for a while — but compensation only masks wear, it doesn't reduce it. Eventually the actual play exceeds what any reasonable offset can correct, and part quality degrades regardless of the setting. We'll tell you honestly where that point is for your specific screw.
That's exactly what proper diagnosis is for. A worn ball screw and a failing drive can produce similar-looking symptoms. Tell us what you're seeing and, where helpful, start with our Testing & Diagnostics service to isolate the actual cause first.
Both, depending on condition. Cleaning, alignment and bearing block service can restore a screw that's still within reasonable wear; a screw with damaged threads or wear beyond tolerance needs replacement. We'll tell you which situation you're in after inspection.
Yes, where we have on-site delivery experience — feed system work is often more practical on-site than shipped, given the size of the components involved. See our country coverage for where we currently offer on-site visits.
Contact
Send us your machine details and axis symptoms — here's how to reach us directly.
Positioning Off? Tell Us What's Happening
Machine model, which axis, and the symptom you're seeing — we'll help you find the real cause.
