Brother introduces high torque 10,000 rpm motor option for its 30-taper spindle TC-R2B and TC-S2D mills

UK sales and service agent, Whitehouse Machine Tools, says this brings heavy machining capability within reach of manufacturers using these lighter duty machines. At the low end of the speed range, it is now possible to drill a 32 mm diameter hole and tap to M27 in 150 HB carbon steel, up from 25 mm and M16 for the standard 10,000 rpm spindle motor. In aluminium, similar increases take the figures to 40 mm and M39. At higher speeds, a 16 mm diameter end mill can take a 15 mm wide by 8 mm deep side cut in carbon steel, while a 125 mm diameter face mill will remove 1,700 cc/min from an aluminium billet. Higher torque is provided by the brushless interior magnet motor at the mid to high speed range as well as at the low end, where it is 2.7 times higher at 92 Nm between zero to 2,200 rpm. Maximum power output is also raised from 18.4 to 26.2 kW. Increased torque at higher speeds means that the spindle can be decelerated faster from top speed to zero, reducing tool change time by 6%, which Whitehouse points out can make a considerable difference when producing large batches involving frequent tool changes.