S&T Dynamics H200 CNC Gear Hobbing Machine – Year 2017
| Max. Workpiece Diameter | Ø200 mm |
| Max. Module | M4.5 |
| Table Diameter | 240 mm |
| Z-Axis Travel (Axial) | 350 mm |
| X-Axis Travel (Radial) | 200 mm |
| Hob Swivel Angle | Max. ±45° |
| Hob Arbor Taper | NT No.40 |
| Hob Diameter / Length | Ø180 / 190 mm |
| Hob Shift Travel | 170 mm |
| Max. Hob Speed | 1,500 rpm |
| Tailstock / Tailstock Stroke | 380 – 780 mm |
| Z-Axis Rapid Feed Rate | 12 m/min |
| X-Axis Rapid Feed Rate | 12 m/min |
| Y-Axis Rapid Feed Rate (Hob Shift) | 1 m/min |
| Table Surface to Hob Center (Z-Axis) | 200 – 550 mm |
| Table Center to Hob Center (X-Axis) | 15 – 215 mm |
| Hob Spindle Output | AC 12 / 16 kW |
| Tailstock Fixation Force | 280 – 1,120 kgf |
| Workpiece Fixation Force | 0.5 – 3 tons |
| CNC Controlled Axes | 6 Axes (X, Y, Z, A, B, C) |
| CNC Control System | Siemens 840D SL |
| Floor Space (L × W × H) | 2,812 × 2,638 × 2,810 mm |
| Machine Weight | 9,000 kg |
S&T H200 CNC Gear Hobbing MAchine
Machine is excellent condition
Siemens control unit
Max. Workpiece Diameter Ø200
S&T Dynamics H200 CNC Gear Hobbing Machine – Technical Evaluation (Year 2017)
1. Technical Evaluation Overview
The S&T Dynamics H200 is a modern CNC gear hobbing machine manufactured in 2017, designed for precision hobbing of small to medium-sized gears. Based strictly on the provided specifications, the machine supports a maximum workpiece diameter of Ø200 mm and a maximum module of M4.5, positioning it in the fine to medium gear production segment.
The machine is configured with 6 CNC-controlled axes (X, Y, Z, A, B, C) and is controlled by a Siemens 840D SL system. Linear travels include Z-axis (axial) 350 mm and X-axis (radial) 200 mm, while hob shift travel (Y-axis) is 170 mm. The hob swivel angle of ±45° enables both spur and helical gear cutting within the stated module range.
The hobbing system accommodates hobs up to Ø180 mm diameter and 190 mm length, mounted on an NT40 arbor, with a maximum hob speed of 1,500 rpm. The hob spindle output is rated at AC 12 / 16 kW, supporting consistent cutting within the defined capacity. The table diameter is 240 mm, and workholding forces are specified at 0.5–3 tons for the workpiece, with tailstock fixation force between 280 and 1,120 kgf.
Machine footprint is 2,812 × 2,638 × 2,810 mm, with a machine weight of approximately 9,000 kg. Rapid feed rates are stated as 12 m/min on X and Z, and 1 m/min on Y (hob shift).
2. What to Check Before Buying
Given the stated configuration and industrial role, inspection should focus on:
Mechanical structure and axes:
Verification of backlash, smooth motion, and repeatability across all 6 CNC axes.
Accuracy of the hob swivel (±45°) mechanism, including rigidity under load.
Condition and flatness of the Ø240 mm table and alignment between table and hob spindle.
Hobbing system:
Condition of the hob spindle bearings and confirmation of stable operation up to 1,500 rpm.
Verification that NT40 hob arbor interfaces are free of wear or runout.
Performance of the hob shift mechanism (170 mm) to ensure even tool wear.
Workholding and tailstock:
Functional testing of the tailstock across its 380–780 mm stroke, including fixation force consistency.
Verification of workpiece clamping forces within the stated 0.5–3 ton range.
CNC and electrical system:
Health of the Siemens 840D SL control, including installed gear hobbing cycles, parameters, and backups.
Review of alarm history, servo drive condition, and electrical cabinet cooling.
3. Typical Industrial Applications
Based strictly on the provided specifications, the S&T Dynamics H200 is technically suitable for:
CNC hobbing of spur and helical gears up to Ø200 mm and module 4.5.
Precision gear production for automotive components, industrial transmissions, and general machinery.
Applications requiring controlled multi-axis interpolation and modern CNC programming flexibility.
Specific gear accuracy classes (DIN/ISO), surface finish capability, and production cycle times are not stated and should be validated by testing.
4. Common Risks in Used Machines
Typical risks for used CNC gear hobbing machines in this class include:
Axis calibration drift, affecting lead and profile accuracy.
Hob spindle wear, influencing surface finish and tool life.
Incomplete CNC data, such as missing parameters or customized hobbing cycles.
Workholding wear, particularly on machines used at higher fixation forces.
5. Maintenance and Service Considerations
With no service history provided, maintenance considerations are limited to general technical aspects:
Regular inspection of spindle bearings, axis lubrication systems, and drive components is essential.
Periodic verification of axis geometry and synchronization is recommended for consistent gear quality.
CNC parameters, gear cycles, and machine constants should be backed up before continued operation or relocation.
Any long-term service or optimization planning should be based on on-site inspection and test cutting rather than assumptions.
Final Note:
The S&T Dynamics H200, as specified, is a well-defined, modern CNC gear hobbing machine with a clear capacity range and advanced Siemens control. While the provided data outlines its core mechanical and CNC capabilities, a complete technical evaluation requires verification of accuracy performance, installed CNC options, and actual cutting condition through direct inspection and trial operation.
