CNC gear hobbing machine with Siemens Sinumerik 828D: a farmer now cuts his own gears.

A machine tool that cuts gear teeth by hobbing. The hob, which looks like a grooved screw, and the gear blank rotate in sync, and the teeth are generated with an involute profile. Hobbing is the most widely used process for external cylindrical gears.

Spur and helical cylindrical gears, pinions from 3 teeth up, worm wheels and involute spline shafts. In practice: reducer pinions and gears, gear pump gears, farm machinery gearbox gears and spare parts copied from a sample.

Module 0.1 to 3 mm and parts up to 120 mm in diameter, from 3 teeth up. The Z-axis travel, which sets how far the hob can feed along the part, is 300 mm.

Grade 7 on the ISO 1328 scale, the usual level for quality gear hobbing. Real accuracy depends on the hob, the material and the workholding. For grades 5 or 6, the gear is ground after heat treatment.

ISO 1328 classifies gears by pitch, profile and helix deviations; a lower number means higher accuracy. AGMA 2015 uses a similar scale, from A2 to A11. Grade 7 is typical for industrial reducers, farm machinery gearboxes and standard pumps.

Yes. The hob head swivels up to ±45°, and the Sinumerik 828D links table rotation to axial feed so the required helix angle comes out on the part.

Yes, both. Worm wheels are cut with a hob that matches the profile of the mating worm. Involute splines are hobbed with a spline hob, exactly like a gear.

Internal gears and gears with a shoulder very close to the teeth are made by gear shaping, on a shaping machine with a pinion-type cutter. A hob needs run-in and run-out room on the outside of the part.

It is a CNC control widely used in European machine shops, with extensive documentation and many programmers who know it. On the delivered machine all the main control units are Siemens and the axes are direct-drive. For a new workshop that matters twice: operators learn faster and support for the control is easy to find.

The price depends on maximum workpiece diameter, module, CNC control and options. The investment in this project was over €100,000. For a quotation, send us the parts you want to make: drawing or sample, material and yearly volume.

Yes, when the investment fits the eligible activities of the programme. In this project, AFIR funding, which channels EU money for rural investment in Romania, backed the diversification of a farm in Pechea, through Miatec, into manufacturing. UZINEX prepares the technical offer and the supplier documents the application needs.

380 V, three-phase, 50 Hz, with 13 kW installed power. The machine weighs 5,900 kg and stands on a concrete floor able to carry that weight. We agree the location and unloading access with the client before delivery.

Training is part of the delivery and takes place at the client's workshop, on his own machine: start-up and shutdown, holding the part between centres, mounting and centring the hob, working with the Sinumerik 828D and the first hobbing programs. After training, the UZINEX engineer stays available for questions.

Usually before. Case-hardening steels such as 16MnCr5 are hobbed soft, then carburized and hardened; when high accuracy is needed the flanks are ground afterwards. Through-hardening steels such as 42CrMo4 are quenched and tempered before hobbing and can be induction hardened after.

A module cutter, or disc cutter, has the profile of one tooth space and machines space by space, with the part indexed on a dividing head; it suits one-offs. A hob generates all the teeth by continuous rolling, is far more productive and gives the correct profile for any tooth count with the same tool.

60 months, with on-site service within 48 hours anywhere in Romania and video support for set-up and programming.

Maximum part diameter and module, gear types (spur, helical, worm wheels, splines), material, yearly volume and, if available, part drawings. We size the machine and the hobs from that.