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Okuma Spindle Repair and Rebuild
We repair and rebuild spindles from Okuma machining centres and lathes as an independent workshop in Germany — bearings, motor windings, encoders, drawbars, tapers and housings. Spindles can be shipped to our workshop for inspection and repair. On-site service is available internationally by prior technical arrangement.
Scope
Okuma spindle systems we work on
Okuma is one of the few machine tool builders that also makes its own control, drives and motors, so a spindle from an Okuma machine is usually part of a closed system rather than a bought-in assembly. That matters for a repair: the mechanical work is ours to do, while anything that turns out to be a control or drive fault has to be identified as such rather than replaced blindly.
Integral motor spindles
The rotor sits directly on the spindle shaft, so a winding fault, a bearing fault and a thermal problem all look similar from the outside. These units are stripped completely, measured, and reassembled with the bearing preload determined for that spindle type.
Belt- and gear-driven spindles
Older and heavier machining centres often use belt or gear drive. Here the usual work is bearings, seals, shaft and housing geometry, plus checking the pulley or gear train for the wear that caused the noise in the first place.
Turning and multitasking spindles
Main and counter spindles from lathes and mill-turn machines, including live tooling heads. Chuck loads and bar work put a different stress pattern on the bearings than milling does, and the inspection reflects that.
High-speed and grinding spindles
Above roughly 15,000 rpm the tolerances for residual unbalance and runout tighten considerably. Every unit leaves the workshop dynamically balanced and run-in tested, with the measured values in the test report.
The exact configuration depends on the machine model and the year of manufacture. Two machines with the same model designation can carry different spindle units, so we confirm the build from your nameplate photograph before quoting.
Symptoms
Faults we see most often on Okuma spindles
Noise and rising vibration
Usually worn or damaged bearings, contamination, or a component that has come loose inside. Best dealt with before it marks the housing bore.
Overheating and thermal drift
Blocked or leaking cooling circuit, wrong preload after a previous repair, or lubrication that has broken down. On Okuma machines this often shows up first as dimensional drift during a long cycle.
Runout at the taper
Damage from a crash or from tool changes under load. The taper is reground and the runout corrected; if the shaft itself is bent, we say so before spending money on the rest.
Tool clamping problems
Drawbar, disc springs, collet or the release cylinder. Symptoms range from tools pulling out under cut to a tool change that simply stops halfway.
Encoder and orientation faults
Feedback errors, failed orientation, or a spindle that will not index for a tool change. We test the encoder as part of the run-in, not only on the bench.
Coolant or grease ingress
Failed seals let coolant into the bearing chamber. Once that has happened the bearings are replaced, not cleaned and reused.
Process
What a repair looks like
The spindle is logged in and inspected on arrival, then dismantled completely. We measure shaft and housing geometry, check the bearing seats, inspect windings and encoder, and photograph what we find. You receive a written quotation with the scope of work before anything is repaired. After the work is done the unit is dynamically balanced, run-in tested and shipped with a test report containing the measured values.
The individual operations — bearing replacement, rotor and stator rewinding, taper regrinding, drawbar and clamping repair, encoder work, seal and cooling circuit overhaul — are described on the services section of our homepage. On an Okuma spindle they are usually combined into one rebuild rather than ordered separately.
What to send with your enquiry
- Photographs of the spindle nameplate and of the tool interface
- Machine model, spindle type and year of manufacture
- A short description of the symptoms and when they appear
- Any measurements you already have — runout, temperature, vibration, current draw
- Whether the machine is still assembled or the spindle is already removed
Removal should be carried out by qualified personnel following the machine documentation. If that is not possible on site, ask us about removal and refitting as part of an on-site visit.
Shipping and on-site service
Our workshop is in Germany and we have no branch, warehouse or permanent staff in other countries. Customers outside Germany send the spindle to us by freight forwarder; we inspect, repair, test and return it. On-site work — removal, installation, alignment and commissioning — is possible internationally, but only after the job has been agreed technically in advance, so that the right parts and instruments travel with the technician.
Questions
Okuma spindle repair — frequently asked
Yes. We are an independent workshop, so you can send a spindle to us directly. We do not need a dealer in the middle, and we are not tied to one manufacturer's parts catalogue. What we cannot do is claim any form of Okuma authorisation — we have none, and we say so plainly.
Most units reaching us come from GENOS, MULTUS, MA and MB machining centres and from LB and LU lathes, but the machine family matters less than the spindle itself. Tell us the machine model, the spindle type and the year, and we will confirm from the nameplate photograph whether we can take the job.
In most cases yes. Integral motor spindles are handled as a complete unit: bearings, rotor and stator, encoder and orientation, seals and the cooling circuit. If a fault turns out to sit in the drive or the OSP control rather than in the spindle, we say so instead of replacing parts on suspicion.
Standard repairs typically take 5 to 10 working days from the day the spindle arrives, depending on parts availability and what the teardown reveals. This is an estimate based on normal cases, not a committed delivery date — a binding date is only valid if we confirm it in writing.
You get a written quotation before any repair work starts. If you decide against the repair after we have dismantled and inspected the spindle, we invoice the inspection work actually carried out plus reassembly and return shipping, at the rates stated in our terms.
Send us the spindle details
Tell us the machine model, the spindle type and what the machine is doing wrong. We come back with an initial assessment and a written quote before any work begins.