EMAG UG 400

The EMAG UG 400 is a universal cylindrical grinding machine with 400 mm (16 in) between centers and a 175 mm (7 in) center height. It grinds outside diameters with a 500 x 40 (50ROS) x 203.2 mm (20 x 1.5 (50ROS) x 8 in) wheel on a 7.5 kW (10.1 hp) spindle at a peripheral speed of 60 m/s, and bores with a high-frequency internal spindle that runs from 20,000 - 125,000 1/min and takes 50 mm (2 in) wheels.

Both spindles sit on a B-axis that swivels from -15° to +225° with 0.0001° resolution and ±2 arc seconds repeatability, taking 8 s for 180°. That range lets one clamping cover an outside diameter, a face at an angle and a bore. Grinding length is 400 mm (16 in) with the straight wheel and 240 mm (9 in) with an angular wheel, so shoulder and face work on angled setups has to fit within the shorter figure. Z is a 640 mm (25 in) table stroke and X a 320 mm (12.5 in) wheel slide stroke, both programmed in 0.0001 mm increments.

Workholding is sized for small and medium parts. Between centers the limit is 60 kg (132 lb); in a chuck the clamping diameter stops at 100 mm (4 in). The workhead has an MT4 taper, stepless speed of 30 - 800 1/min, 12 Nm (8.8 ft-lbs) of torque and swivels 0 to +30° for steep tapers, while the table itself swivels 8.5°. The MT4 tailstock has a 60 / 40 mm (2 / 1.5 in) quill diameter / stroke and micro taper correction of ±0.040 mm.

Dressing is done on the workpiece head with dressing blades for the external wheel and by a swing-arm unit on the table for the internal wheel. The control is FANUC 0i-TF Plus; the FANUC 31 B Plus is the option for out-of-round grinding. The UG Series as a whole runs to 1,500 mm (59 in) of grinding length and an 11 kW spindle, so the UG 400 is the entry point for shorter work.