Machines | S250M
CNC Milling Machine for Steering Rack Gears S250M Steering
The KESEL S250M Steering is the specialized milling machine for series production of single- and dual-pinion steering rack gears in the automotive sector. With 45 kW drive power and a dual clamping system, it delivers the highest precision at the lowest cost per part.
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Quality, stability, and volume: The brand-new S250M Steering rack gear milling machine excels in all areas. With a focus on first-class quality, our expert team has developed our latest platform to achieve the highest precision standards in a system designed for economical cost per part.
Whether single- or dual-pinion, our latest dual clamping system ensures that manual and automated processes can be performed with ease and in high volumes. The S250M Steering is supplied either as a single machine for standard steering rack gears or as a fully automated 2-station cell for dual-pinion production and is available with a range of flexible automation options.
With an integrated coolant management system, the S250M Steering offers a compact and flexible solution for high-volume production of steering rack gears. The ability to change tools in just a few minutes guarantees both machine uptime and flexibility at all times.
Specifications
| Parameter | Value |
| Working Range | |
| B1-axis (swivel axis) | +/- 25° |
| Y-axis (vertical, milling depth) | 245 mm |
| Z-axis (horizontal, feed) | 550 mm |
| Milling Head F1-HSK | |
| Speed | max. 450 rpm, infinitely variable |
| Cutter arbor mount | HSK-B125 DIN 69893 |
| Max. Cutter Width | 250 mm |
| Cutter diameter | 170 mm + 2 x milling depth |
| Max. Cutter Diameter | 310 mm |
| Power | 45 kW S6 40% |
| Type | F1-HSK gearbox with high drive power |
| Control | Siemens SINUMERIK ONE |
| Clamping System | Special clamping fixture for dual setup to produce single pinion or the first and second gearing for dual pinion. |
| Coolant and Chip Management | |
| Fill capacity | 3,300 liters |
| Coolant | Oil |
| Chip discharge | with return pump |
| Pre-separation | via magnetic filter drum |
| Electrical Connection Data | |
| Voltage | 3 x 400 V |
| Current | 80 A |
| Dimensions and Weight | |
| Installation dimensions | Length 5,300 x Depth 5,000 x Height 2,600 mm |
| Machine weight | approx. 17,000 kg (incl. control cabinet) |
Options
- Robot automation for loading and unloading
- Twin A1-axis for production of dual-pinion steering shafts
- Milling accessories for additional steering rack gear types
- Fine filter option for smaller particle sizes and higher separation efficiency
- Cutter changing device
- Oil mist extraction system
- Automatic fire suppression system
- Automatic door for loading and unloading opening
What Makes the S250M Stand Out
Milling - Clamping
A brand-new milling head, a hybrid construction of machine bed and carriage, a redesigned counter bearing, and an optimized clamping fixture. The S250M Steering is not just a new model—it is a completely new machine!
The new F1-HSK milling head with specially calculated power transmission delivers unbeatable torque in a perfectly balanced speed range. Combined with our latest counter bearing, runout accuracy has been further improved, increasing both the quality of the finished surface and tool life.
Our latest dual clamping unit with centric clamping can be adapted for single- or dual-pinion and is optimized for manual or fully automated operation.
Control
The Siemens SINUMERIK ONE control combines a powerful hardware architecture with premium-class drive and motor technology to ensure highly dynamic performance and machining precision. This allows the S250M Steering to be integrated into a wide range of IT environments and automation systems.
Coolant and Chip Management
Thorough analysis and development by our engineering team has resulted in our latest coolant and chip management system.
Excellent chip removal and cooling performance ensure optimal tool life and workpiece quality.
Steering Rack Gears
The S250M Steering was specifically developed for the production of steering rack gears, but is a true all-rounder in this manufacturing segment! Whether single- or dual-pinion, standard or ball screw steering rack gears, the S250M Steering offers high-precision manufacturing capabilities for high volumes, regardless of rack type.
Automation
The S250M Steering offers numerous manual and automated setup options for absolute flexibility. Whether as a single machine or as a fully automated dual-pinion cell—there is the perfect configuration for every application.
FAQ – frequently asked questions
Both our standard and our twin A1-axis can clamp 2 racks simultaneously, ensuring maximum productivity.
Yes! The S250M rack gear milling machine can not only mill standard racks with single gearing, but also ball screw racks with double gearing.
Yes. By using our twin A1-axis, this is possible. For mass production, we have also developed a standalone 2-station cell that mills dual-pinion racks with fully automated operation.
The S250M Steering can be operated with both oil and emulsion. We favor oil as the cooling medium, as this ensures optimal surface finish, lubrication, and thus longer tool life.
We have been working with Tier 1 automotive suppliers for many decades. As a result, we know the industry's requirements precisely. We have machines installed at almost all leading manufacturers worldwide.
Milling steering rack gears offers the best combination of productivity, precision, flexibility, and investment. The market has confirmed this year after year.