With the Numerika series from Zema, the Junker Group offers cylindrical grinding machines with corundum. Now, with the new Numerika GH 3500 2W, the range has been expanded for the first time with a machine that has two grinding headstocks with their own cross slide. Compared to the single-slide machine, in which the workpiece is first turned and then machined in two set-ups, the synchronous machining of both sides of the workpiece reduces the overall cycle times by more than half, according to the company. In addition, complete machining in one clamping operation increases quality. With its features and a high degree of automation, it is therefore particularly suitable for users who primarily machine large workpieces in large quantities.

Space-saving XL machine

With the new Numerika, workpieces weighing up to 350 kg can be sanded, and even up to 1000 kg in the optional Kargo version. The largest version is designed for a clamping length of up to 3000 mm, a sanding length of 780 mm on both sides and a swing diameter of up to 650 mm.

The large grinding wheel packs with a maximum diameter of up to 915 m and correspondingly long service life enable a long service life.

The machine is designed in such a way that it can be loaded from above even if the hall is less than five meters high. The machine can be optionally equipped with fully automated loading and unloading systems.

Low maintenance thanks to hydrostatic technology

The Numerika GH 3500 2W from the Junker Group machines workpieces synchronously with two grinding headstocks. © Junker

The Numerika is equipped with Zema hydrostatic technology. This means that the spindles of the workhead and sanding headstock are mounted hydrostatically and the X and Z axes of the cross slides are also guided hydrostatically. A fine layer of oil ensures very good rotation of the spindles with constant shaft centring and uniform, jerk-free movement of the cross slide, which can be positioned with high precision.

As there is no metal-to-metal contact, the energy required for the drive is reduced and wear is minimized. At the same time, the hydraulic medium cools permanently and acts as a vibration damper. All of this reduces the machine's maintenance requirements.

Easy handling and operation

Both workpiece headstocks are each driven with the same power. This increases torque transmission and brings heavy workpieces up to high speeds quickly. In addition, support steady rests stabilize longer workpieces and thus ensure faster grinding with high quality.

The torsion-resistant machine bed of the Numerika GH 3500 2W ensures high quality in the sanding process. Users also rely on the machine because of its ease of use. The user-friendly control system offers all the necessary input screens for precise sanding and very good surface finishes.

Worldwide service

As a Junker Group company, Zema has access to its global sales and service network. Machine operators receive support from trained employees and, if necessary, rapid assistance around the globe, 24 hours a day, 7 days a week.

EMO Hannover: Hall 11, Stand B78