KAPP NILES KX 500 Flex Gear Grinding Machine
Key Specifications
Spindle Power
Max Workpiece ⌀
Repeatability
max module
max face width
grinding wheel diameter
Overview
The KAPP NILES KX 500 Flex is a universal CNC gear grinding machine engineered for flexible production of external and internal gears up to 500 mm diameter. Developed by KAPP NILES — the Coburg, Germany-based specialist in gear and profile grinding — the KX 500 Flex is designed to serve manufacturers who need to grind a diverse range of gear types on a single machine platform. It supports both threaded wheel grinding for high-volume external gear production and profile grinding for gears with complex or non-standard tooth forms, making it one of the most versatile solutions in the 500 mm diameter class.
The KX 500 Flex distinguishes itself through its interchangeable grinding spindle concept. Operators can switch between the threaded wheel grinding spindle and the profile grinding spindle in a defined setup sequence, allowing the same machine footprint to handle serial automotive gear production and small-batch industrial gears within the same production week. This flexibility is particularly valuable for contract gear manufacturers and industrial OEMs whose production mix shifts with customer demand. KAPP NILES also integrates an on-board dressing unit that dresses both wheel types, supporting the full range of gear modifications including crowning, tip and root relief, and topological corrections.
The machine's CNC control runs KAPP NILES's proprietary KNC software on a Siemens hardware platform. KNC provides a graphical gear parameter input environment that calculates axis motions automatically from standard gear data, reducing programming time and eliminating the need for specialized CNC gear programming skills. Process monitoring and quality feedback loops are built into the control, and the KX 500 Flex is compatible with KAPP NILES's KiM (KAPP integrated Metrology) inline measurement option for closed-loop quality control without a separate CMM step.
New KX 500 Flex machines are generally quoted in the $850,000 to $1,300,000 range depending on spindle configuration, automation, and metrology options. Competing machines include the Gleason Genesis 400/500 series, Reishauer RZ 550, and Liebherr LGG 500. KAPP NILES machines are widely used in European automotive supply chains and have strong adoption among aerospace and industrial gearbox manufacturers globally.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 500 mm (19.69 in) |
| Max Module | 12 mm |
| Max Face Width | 400 mm (15.75 in) |
| Grinding Wheel Diameter | Up to 350 mm |
| Spindle Motor Power | 40 kW |
| Grinding Modes | Threaded wheel grinding + profile grinding (interchangeable spindle) |
| Internal Gear Grinding | Yes (with profile grinding spindle) |
| Control System | KAPP NILES KNC (Siemens-based) |
| Dressing | Integrated on-board dressing unit |
| Profile Modifications | Crowning, tip/root relief, topological corrections |
| Inline Metrology | Optional KiM inline measurement |
| Quality Achievable | DIN 3–5 / AGMA 11–12 |
| Repeatability | ±0.002 mm |
| Machine Weight | ~16,000 kg |
Strengths & Limitations
Strengths
- Interchangeable threaded wheel and profile grinding spindles on one machine platform — the most flexible configuration in the 500 mm diameter class for contract gear manufacturers
- Internal gear grinding capability with the profile spindle extends the machine's scope to ring gears and planetary carriers that threaded wheel grinders cannot reach
- KAPP NILES KNC software generates axis motions from standard gear data inputs, eliminating the need for specialized CNC gear programming expertise on the shop floor
- Optional KiM inline metrology closes the quality loop directly at the machine, reducing the need for a dedicated gear inspection machine and floor space
Limitations
- Spindle changeover between threaded wheel and profile grinding modes adds setup time versus a dedicated single-mode machine — less efficient for shops running only one gear type at high volume
- At $850,000–$1,300,000, the KX 500 Flex requires substantial production volume or premium contract pricing to achieve adequate return on capital investment
- KAPP NILES service and tooling support is more concentrated in Europe; North American users may experience longer response times and higher consumable logistics costs than with US-headquartered vendors
Best For
Frequently Asked Questions
01
The KX 500 Flex adds the interchangeable grinding spindle concept to the base KX 500 platform. The standard KX 500 is a threaded wheel grinding machine; the Flex variant allows swapping between the threaded wheel spindle for high-speed serial external gear grinding and a profile grinding spindle for slower but more flexible single-profile grinding. This makes the Flex variant particularly suited for shops with diverse part programs, at a cost premium over the dedicated threaded wheel model.
02
Yes, with the profile grinding spindle configuration. Internal gear grinding requires the profile spindle and appropriate wheel geometry. The KX 500 Flex can grind internal ring gears up to approximately 500 mm pitch diameter, covering planetary carrier ring gears in automotive automatic transmissions, industrial planetary reducers, and large-bore instrument gears. Threaded wheel grinding of internal gears is not possible on this platform.
03
The KX 500 Flex achieves DIN quality 3–5, equivalent to AGMA 11–12. This level of precision covers the full range of automotive, aerospace, and precision industrial gear applications. For DIN 3 requirements (the highest precision class for ground gears), optimal process conditions including temperature control, proper wheel selection, and minimized workpiece clamping forces are required. The optional KiM inline metrology system assists in verifying and maintaining these quality levels during production.
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