Hardinge Kellenberger VM30

The Kellenberger VM30 is a compact CNC grinder for small chucked parts: workpieces under 150 mm (5.9 in) in diameter, up to 150 mm (5.9 in) long and up to 50 kg (110 lb), on a footprint of 1.8 m × 1.8 m. It carries one or two high-frequency spindles, and the internal grinding spindle is listed at 120,000 rpm and 7.5 kW.

That spindle speed says most about the intended work. A wheel small enough to enter a bore of a few millimetres only reaches a useful surface speed at very high rotational speed, so 120,000 rpm points to small-bore internal grinding: bearing rings, bushings, nozzles, collets and similar parts. With two spindles fitted, a bore and a second feature such as a face or a seat can be finished in one clamping; with one, the machine is a single-operation bore grinder. Which configuration is quoted changes what the machine can do, so settle it early.

The axes are generous for the part size. X travels 325 mm (12.8 in) and Z 300 mm (11.8 in), both about twice the 150 mm part envelope, which is the room needed to bring a second spindle or a dresser into position. Axis resolution is 0.1 µm, and roundness is listed as 0.4 / 0.2 μm. The table does not say which condition each roundness value belongs to, so ask whether the smaller one depends on an option.

Work is held on a workhead with an MK 4 taper, with a centre height of 100 mm (3.9 in), a centre distance of 150 mm (5.9 in) and a chuck load rating of 100 Nm. The control is listed as FANUC 0i-TF Plus with the BLUE Solution interface, and the supply is 400 V / 460 V.