noneExtremely reliable machine designed to repair various type of engine valve seats ring. Equipped a guide shaft with corresponding size, the machine can repair the valve seats ring with diameter 20-90mm and working conical angle 30?45,60, the air-floating worktable clamp the work-pieces and freely move. The high precision universal boring bar is attached to ball joint which enables it to be used with inclination in any direction. Movement is transmitted by a motor which operate with constant torque. These combined movements enable the tool to control the real axis of the valve guide and enable the boring is carried out with absolutely precision. T8590A is improved from T8590, adopted rectangular guide way with high rigidity. Machine head can move up and down automatically, easy adjusting and operating. Main Specification: Boring diameter: Φ20-Φ90mm Spindle speed range: 55,85,210,370,550rpm Spindle travel: 180mm Distance from spindle axis to column surface: 270mm Max. distance from end of spindle to working table: 750mm Cylinder head fixture movement on table: 120*860mm Main motor power: 1.1/0.85kw 1400/950rpm Moving speed of machine head: 512mm/min Machine overall diameter: T8590A 1300*900*1980mm T8590 1300*800*1390mm