Patent ID: 6588307
Filing Date: 2003-07-08
Classification: B23B,B23Q,Y10T

Abstract:
A CNC lathe with double-speed shifting feature in spindle axis for simultaneously shifting a worktable assembly and a tool holder assembly so that the worktable assembly is shifted relative to the tool holder with a shifting speed double of a shifting speed between a worktable assembly and a tool holder assembly when only one of the worktable assembly and the tool holder assembly is moved, the CNC lathe comprising:a frame having a lengthwise spindle axis direction and a widthwise direction perpendicular to the lengthwise spindle axis direction; a screw rod including two sections of opposite threads, namely a positive thread section and a counter thread section, and a pivotally disposed on the frame in the lengthwise spindle axis direction; a worktable assembly reciprocatably disposed on the frame in the lengthwise spindle axis direction, including a first nut engaging the counter thread section of the screw rod for reciprocating the worktable assembly in a shifting direction along the lengthwise spindle axis direction when the screw rod is rotated in one direction; a tool holder assembly reciprocatably disposed on the frame along the lengthwise spindle axis direction, including a second nut engaging the positive thread section of the screw rod for reciprocating the tool holder assembly in a direction opposite to the shifting direction of the worktable assembly along the lengthwise spindle axis when the screw rod is rotated.