New Equipment, New Productivity: The EG-ZM200D2 Stepper Motor Rotor Grinder
YiBei Precision Machine Co., Ltd. has put a new machine into its line-up — and it changes what a rotor grinding line can do. The EG-ZM200D2 high-precision CNC stepper motor rotor grinder is purpose-built for stepper motor rotors, and it is designed around one simple promise to our customers: advanced equipment, verified accuracy, and production you can plan around.
Where a general-purpose grinder forces a choice between tolerance and throughput, this machine delivers both. That means our customers get parts that pass incoming inspection the first time — and get them faster.
Advanced Equipment: What Makes It Different
- Rigid, stress-relieved cast-iron bed with reinforcing ribs, so accuracy does not drift as the shift goes on.
- Double-V plastic-coated, hand-scraped guideways on both slides — the friction characteristics that hold true micron-level feeds.
- Hardened spindle (HRC 62–64) ground and lapped to run in high-precision ball bearings with grease lubrication, up to 2,950 rpm.
- 5.5 kW dynamically balanced wheel spindle running wheels at 60 m/s and above for cooler, freer cutting on thin-walled rotors.
- Position feedback by magnetic scale at 0.5 µm resolution, read directly — no drive-train guessing.
- Xinjie XDH5 CNC with YiBei EasyGrinding software on a bus-based PLC platform: 0.0005 mm programming resolution and 5,000 mm/min interpolation.
- OMRON / Fuji control components, IP55 cabinet with constant-temperature air conditioning instead of ventilation fans — stable control in hot, dusty workshops.
New Productivity: Numbers, Not Promises
| Production factor | EG-ZM200D2 | What it means for your line |
|---|---|---|
| Cycle time (42 two-piece rotor, allowance under 0.1 mm) | 22 seconds or less | More than 1,600 parts per shift at full loading |
| Slide speed, both axes | Up to 10,000 mm/min | Fast air-cut and return, no wasted seconds |
| Automatic loader (optional, W + U axes) | Dual tray, up to 200 parts per load | One operator can run several machines |
| CNC wheel dressing, shared two-axis interpolation | Automatic, programmable interval | No manual dressing stops, consistent wheel form all shift |
| Auto compensation | Down to ±0.0005 mm | Size stays on target without operator intervention |
Precision You Can Verify Before You Commit
We do not ask customers to take accuracy on faith. The EG-ZM200D2 is specified in open-loop production to hold:
- Diameter: ±3 µm over a 90 mm length
- Roundness: 3 µm
- Cylindricity: 3 µm over a 50 mm length
These are the tolerances met on your parts, checked on a sampling basis during factory pre-acceptance, with results signed off by both parties before the machine ships. If the numbers are not there, the machine does not leave the plant.
Why Customers Can Order With Confidence
- Your own parts, ground first. Pre-acceptance runs on the workpieces you send, on your drawing requirements — not on demo blanks.
- Your team, trained before delivery. Two of your engineers spend five working days at our Yiyang plant covering operation, programming, maintenance and data backup.
- We stay until production is stable. Installation, alignment, commissioning and a five-day on-site training programme at your factory, followed by a final acceptance run.
- 12-month warranty, lifetime support. Failed components replaced free during warranty; maintenance and spares available for the life of the machine.
- Full documentation. Two complete sets of technical files — operation, programming, electrical, pneumatic, hydraulic, lubrication drawings, foundation and layout, plus system backup media.
Built for the Rotor, Not Adapted to It
Everything is configured around the workpiece. A 125 mm centre height and 2 kg capacity suit small, slender rotors. The V-type quick-support work rest with roller-driven rotation keeps the part located without crushing thin walls, the work head adjusts to ±1° for taper control, and the table swivels ±2°. A full-enclosure splash guard covers both grinding and loading zones, and every drive stops the instant the guard opens.
Grinding fluid is handled by a paper-bag filter plus magnetic separator unit, keeping coolant clean enough for surface finish and OD tolerance held below 0.001 mm. An interface for oil-mist extraction is pre-machined at 100 mm diameter.
Availability
The EG-ZM200D2 is available now for order, with manufacturing, commissioning and sample grinding completed 60 working days after deposit. Custom fixturing, wheel specification guidance and fully non-standard machine design are available for unusual rotor geometries.
Send us your rotor drawing and a sample batch — we will grind it, measure it, and show you the numbers before you place an order.
