Mazak Integrex Series Spindle Repair
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Multi-tasking machines. Multi-axis spindle wear.
Atlanta Precision Spindles rebuilds milling and turning spindle assemblies for the Mazak Integrex i-H Series — bearing replacement, drawbar service, preload restoration, and Class 10K clean room assembly.
The Mazak Integrex is a different kind of machine to repair spindles on. Where a vertical machining center runs one spindle through one type of load, an Integrex subjects its spindle assemblies to continuously varying loads — turning, milling, and multi-axis interpolation within the same cycle. The milling spindle runs at high RPM for finishing passes, then the turning spindle carries full torque load during heavy stock removal. Neither assembly gets a recovery period between demanding operations.
We rebuild both spindle assemblies on Integrex platforms: the milling spindle (12,000 RPM standard, with 20,000 RPM high-speed option) and the main turning spindle, across the full i-100H through i-450H range. Each model carries different bearing specifications, preload requirements, and torque ratings — and we work to the specs of the specific platform, not a generic Mazak procedure.
Why Integrex Spindles Fail
Integrex spindle wear doesn’t follow a simple pattern. The machine’s design — combining a full turning center and a machining center in one platform — means spindle assemblies absorb a more varied load profile than either machine type alone. That variety is also what makes symptoms harder to read. An Integrex running turning operations one hour and 5-axis milling the next puts a different kind of demand on bearings than a dedicated lathe or VMC ever would.
Failure Patterns Specific to Mazak Integrex Spindles
Bearing fatigue from multi-axis load variation. Integrex milling spindles handle B-axis positioning across a -30° to +210° range while the spindle is running. Load direction changes constantly. Bearings that are sized for steady-state radial or axial load see combined loading that accelerates fatigue in ways that pure-axis machines don’t produce. Finish degradation during compound-angle operations is often the first indicator.
Drawbar wear. The drawbar on an Integrex milling spindle operates through every tool change across a 38-tool magazine. Tool change frequency on a multi-tasking machine is higher than on most VMCs because the machine is completing full parts in one setup. Drawbar clamping force degrades over time, and when it does, tool pull-out force drops — showing up as torque-off events, tool shifts mid-cut, or inconsistent runout that changes between tool changes.
Thermal expansion affecting tight tolerances. The Integrex i-H Series uses temperature-controlled cooling oil circulating through spindle bearings and ball screw cores to maintain dimensional stability. When bearing wear alters the thermal profile of the spindle, the machine’s compensation system — calibrated for a healthy spindle — can no longer keep up. Tolerance drift on tight-tolerance features, particularly during long cycles, is the pattern we see most on Integrex jobs.
Second spindle wear in S and ST configurations. Integrex i-H S and ST machines add a second spindle for Done-In-One processing. The second spindle handles workpiece transfer and secondary operations — a different load profile from the main spindle, but one that still accumulates hours. Second spindle issues often go unaddressed longer than main spindle problems because secondary operation finish quality gets less direct attention.
Integrex Spindle Specifications We Service
The Integrex i-H Series runs across five machine sizes, each with distinct spindle specifications. Main spindle speed decreases as chuck size and torque increase — the i-100H turns at 6,000 RPM while the i-450H turns at 3,300 RPM with over 1,200 N·m of torque. The milling spindle is consistent across the range at 12,000 RPM standard, with a 20,000 RPM high-speed option available across all models.
| Model | Main Spindle Speed | Main Spindle Output | Max Torque | Chuck Size |
|---|---|---|---|---|
| i-100H Series | 6,000 RPM | 11 kW (15 hp) | 159 N·m (117 ft·lbs) | 6″ |
| i-200H / i-250H Series | 5,000 RPM | 22 kW (30 hp) | 350 N·m (258 ft·lbs) | 8″ |
| i-350H Series | 4,000 RPM | 30 kW (40 hp) | 724 N·m (534 ft·lbs) | 10″ |
| i-450H Series | 3,300 RPM | 37 kW (50 hp) | 1,200 N·m (885 ft·lbs) | 12″ |
The milling spindle is a separate rebuild from the main turning spindle. The standard 12,000 RPM milling spindle outputs 12 kW on i-100H and i-200H platforms, and 24 kW on the larger i-250H through i-450H machines. The optional 20,000 RPM high-speed milling spindle is available across the full range and uses the same HSK-A63 tool interface. Both milling spindle variants are handled as distinct rebuilds with their own bearing sets and preload specifications.
What the Rebuild Covers
Bearing Replacement & Preload
Precision-grade bearing sets matched to the specific spindle — milling or turning — and the torque and speed ratings of the platform. Preload is set and verified before final assembly, not estimated from a general specification.
Drawbar Inspection & Service
Drawbar clamping force is measured and compared against specification. Worn drawbar components are replaced. On a machine that completes full parts in one setup, drawbar integrity directly affects part quality on every single operation.
Rotor Balancing
Dynamic balance is verified after reassembly. The Integrex milling spindle’s SMOOTH Ai Spindle function detects vibration and adjusts cutting conditions — but that system works around a spindle problem, it doesn’t fix one. A balanced spindle is what the AI compensation was designed to start from.
Class 10K Clean Room Assembly
Both milling and turning spindle assemblies are reassembled in our Class 10K clean room. Contamination introduced during reassembly is a leading cause of early bearing failure after a rebuild — the clean room eliminates it.
Diagnosing an Integrex Spindle Problem
Integrex spindle symptoms are easy to misread because the machine does so many things in one cycle. A few indicators that point specifically to spindle wear rather than tooling, programming, or fixturing:
- Finish quality changes between turning and milling operations within the same cycle
- Vibration appears during B-axis milling that isn’t present during straight-axis cuts
- Tool pull-out during heavy milling passes, or torque-off alarms that weren’t occurring previously
- Runout measured at the HSK taper changes between tool changes on the same holder
- Tolerance drift on tight features that worsens as cycle time increases
- Heat building at the milling spindle nose during long production runs
- Second spindle finish degrading on secondary operations while main spindle results appear normal
On a machine this capable, the temptation is to adjust programs, change tooling, or revisit fixturing before pulling the spindle. That’s usually the right sequence for a new problem. But when symptoms persist across those adjustments — especially on a high-hour machine — the spindle assembly is where to look next.
Send Us Your Integrex Spindle
We rebuild Mazak Integrex milling and turning spindles for shops across the Southeast and nationwide. If you’re not sure whether you’re dealing with a spindle problem or something else, call us — we can help you work through the symptoms before you pull anything.
Phone: (678) 225-7855
Location: Lawrenceville, GA
Frequently Asked Questions
Do you rebuild both the milling spindle and the turning spindle on Integrex machines?
Yes. The milling spindle and the main turning spindle are separate assemblies with different bearing sets, preload specs, and rebuild procedures. We handle both. If you have an ST configuration with a second spindle, we service that assembly as well. Most shops send whichever spindle is showing symptoms first, but it’s worth having us inspect both if the machine has significant hours and you’re already pulling one.
The machine has the 20,000 RPM high-speed milling spindle option. Can you rebuild that?
Yes. The optional 20,000 RPM milling spindle uses the same HSK-A63 interface as the standard 12,000 RPM version but requires higher-grade bearings and tighter balance tolerances given the speed. We rebuild both variants and specify bearing sets accordingly.
The SMOOTH Ai Spindle system keeps compensating for chatter. Does that mean the spindle is worn?
Not necessarily on its own — the AI vibration detection and compensation is doing what it’s designed to do. But if compensation is activating more frequently than it used to, or at speeds and depths where it previously wasn’t needed, that pattern suggests the spindle’s baseline condition has changed. Increased reliance on AI chatter compensation is worth treating as a diagnostic signal rather than a solution.
How long does an Integrex spindle rebuild take?
Most rebuilds complete in 5–10 business days from receipt. The milling spindle and turning spindle take similar time when sent together. If secondary damage — rotor work, drawbar replacement, housing repair — is needed beyond bearing replacement, the timeline extends and we communicate that clearly after inspection.
We have an i-450H running heavy turning work. The torque specs on that main spindle are very high — is a rebuild realistic?
Yes. The i-450H main spindle runs at 3,300 RPM with up to 1,200 N·m of torque — it’s a heavy-duty assembly with correspondingly robust bearings. The rebuild process is more involved than a lighter platform, but it’s well within what we do. High-torque turning spindles actually tend to present with clearer bearing wear symptoms than high-speed milling spindles because the loads are more direct and the signs — noise, vibration under torque load, heat at the housing — are harder to misattribute.
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