Jainnher S40 CNC Cylindrical Roll Grinder

The Jainnher S40 is the smallest type in Jainnher's CNC cylindrical roll grinding machine range, for rolls up to 400 mm (15.7 in) in diameter and 1,500 kg (3,307 lb). It is offered with a distance between centers of 1.5, 2, 3 or 4 m (4.9, 6.6, 9.8 or 13.1 ft).

Jainnher builds its roll grinders in four classes, S, M, L and H, and the S40 is the only one with a wheel head of its own. The wheel is Ø500 x 50 x Ø152 mm and runs from 300 to 1,800 rpm on a 15 HP (11.2 kW) motor. Every larger type uses a Ø910 wheel at lower speed. In practice that makes the S40 closer to a long cylindrical grinder than to a mill roll grinder: it suits printing and coating rolls, rubber-covered rolls, long shafts and small work rolls.

The wheel head carriage and the table both run on what Jainnher calls a hydrostatic and dynamic lubrication system, intended to give smooth motion with low friction between base and table. Cross feed is 0.001 mm per pulse at up to 1,000 mm/min. The table traverses at 25 to 3,000 mm/min, half the top speed of the bigger types.

The headstock is driven by a variable frequency motor at 10 to 100 rpm and carries an MT#5 center. A CNC controller runs the grinding sequence from stored programs and generates crown profiles, including sine, cosine and CVC curves. Coolant capacity is 280 L.