Abstract
The speed increasing spindle for an M/C using a traction drive (TD) isdeveloped by the authors. The wedge roller TD, whichgenerates a contact force in proportion to a transmitted torque, is adopted to reduce a heat generation. The performance ofdeveloped spindle is evaluated by comparing that of the spindle using planetary gears. The experiments were carried out usingthe square end mill of 2 mm in dia. and a workpiece of NAK55. The rotary speed of tool is 5000 min–1 and the cutting depth and feed are changed variously. The surface roughness in case of the TD spindle shows 0.1 to 0.23 μmRa better than that of the gear spindle. The temperature rise of TD spindle is larger than that of gear spindle because an oil seal is used to prevent a traction oil leakage.
