CNC gear hobbing machine with Siemens Sinumerik 828D: gears with module 0.1–3 mm, parts up to 120 mm, ISO 1328 grade 7.
| Gear types | spur and helical cylindrical gears, worm wheels, spline shafts |
| Module | 0.1–3 mm |
| Maximum workpiece diameter | 120 mm |
| Minimum number of teeth | 3 |
| Accuracy | grade 7, ISO 1328 scale |
| CNC axes | 7 |
| CNC control | Siemens Sinumerik 828D, Siemens direct-drive axes |
| Maximum hob (diameter × length) | 80 × 90 mm |
| Hob clamping | BT30 taper, automatic hydraulic clamping and release |
| Hob arbors included | Ø8, Ø10, Ø13, Ø16, Ø22 mm |
| Maximum hob speed | 5,000 rpm |
| Hob head swivel | ±45° |
| Z-axis travel | 300 mm |
| Hob axis to workpiece axis distance | 15–95 mm |
| Rotary table diameter | 150 mm |
| Maximum table speed | 270 rpm |
| Installed power | 13 kW |
| Power supply | 380 V, three-phase, 50 Hz |
| Weight | 5,900 kg |
| Interface | keyboard and screen in English |
This CNC gear hobbing machine cuts spur and helical cylindrical gears, worm wheels, spline shafts and pinions, with module 0.1 to 3 mm and parts up to 120 mm in diameter. It has 7 axes controlled by a Siemens Sinumerik 828D with Siemens direct-drive axes, and works to grade 7 on the ISO 1328 scale.
It suits a workshop that makes gears in small and medium batches: a machine shop, a farm machinery repair service, or a reducer and pump maker that wants to cut its own gears. The same machine goes from a replacement gear copied from a sample to a batch of several hundred parts by changing only the program and the hob.
“I know what a stopped machine costs in the middle of the season. Now the gear we need is cut right here, and we cut it for others too.”
| Parameter | Value |
|---|---|
| Gear types | spur and helical cylindrical gears, worm wheels, spline shafts |
| Module | 0.1–3 mm |
| Maximum workpiece diameter | 120 mm |
| Minimum number of teeth | 3 |
| Accuracy | grade 7, ISO 1328 scale |
| CNC axes | 7 |
| CNC control | Siemens Sinumerik 828D, Siemens direct-drive axes |
| Maximum hob (diameter × length) | 80 × 90 mm |
| Hob clamping | BT30 taper, automatic hydraulic clamping and release |
| Hob arbors included | Ø8, Ø10, Ø13, Ø16, Ø22 mm |
| Maximum hob speed | 5,000 rpm |
| Hob head swivel | ±45° |
| Z-axis travel | 300 mm |
| Hob axis to workpiece axis distance | 15–95 mm |
| Rotary table diameter | 150 mm |
| Maximum table speed | 270 rpm |
| Installed power | 13 kW |
| Power supply | 380 V, three-phase, 50 Hz |
| Weight | 5,900 kg |
| Interface | keyboard and screen in English |
A hob is a rack profile wrapped around a cylinder. The hob and the workpiece rotate in sync, and the Sinumerik 828D holds the ratio between them electronically: with a single-start hob, the workpiece advances one tooth for every hob turn. While they rotate, the hob feeds across the face width and generates involute flanks. For helical gears the hob head swivels, and the control adds the extra table rotation that produces the helix angle.
The workpiece is held between centres on an arbor. The tailstock has a hydraulic cylinder and a live centre that protects the centre hole. Between parts the hob shifts along its own axis, so wear spreads over its whole length and the tool lasts longer.
• Siemens Sinumerik 828D control, with all main control units from Siemens and direct-drive axes.
• BT30 hob spindle with automatic hydraulic clamping and release, for fast hob changes.
• Roller linear guides on the X and Z axes, for rigidity and accuracy that holds over time.
• C axis driven by a precision motor for exact table indexing, and a servo-driven Y axis for hob shifting.
• Enclosed work area with stainless steel inner guarding, electric door interlock, hydraulics, lubrication, coolant and chip separator.
Reducer pinions and gears, gear pump gears, farm machinery gearbox gears, bronze worm wheels, PTO spline shafts and spare parts copied from a sample. Common materials are 42CrMo4, 16MnCr5, 20MnCr5 and C45 steels, CuSn12 bronze, cast iron and engineering plastics.
Hobs for the modules you need, spline and worm wheel hobs, extra arbors, and a fine set-up device that positions the hob on teeth already cut, for a finishing pass on hardened flanks. For larger parts or coarser modules we configure the machine in the quotation.
Transport, installation, commissioning and operator training are included. Training takes place at the client's workshop, on the client's machine: workholding, mounting and centring the hob, working with the Sinumerik 828D and the first hobbing programs. The warranty is 60 months, with on-site service within 48 hours anywhere in Romania.
The price depends on the configuration, the hobs and the options. For a quotation, send us the parts you want to make: drawing or sample, material and yearly volume. The machine can also be bought with EU funding; we prepare the technical offer and the supplier documents for the application.
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