Abstract: A grinding machine, which includes a grinding wheel rotatable by a motor, a first slide movable in X-axis direction, a second slide supported on the first slide and movable in Y-direction, a bracket supported on the second slide and turnable about Y-axis, a tool holder supported on the bracket for holding the workpiece for grinding by the grinding wheel, and a driving mechanism for rotating and reciprocating the tool holder.

Abstract: A grinding machine, which includes a grinding wheel rotatable by a motor, a first slide movable in X-axis direction, a second slide supported on the first slide and movable in Y-direction, a bracket supported on the second slide and turnable about Y-axis, a tool holder supported on the bracket for holding the workpiece for grinding by the grinding wheel, and a driving mechanism for rotating and reciprocating the tool holder.

Abstract: Anti-skid socket for fastening to the chuck of a boring machine to hold a screw tap for allowing synchronous rotation of the screw tap with the chuck of the boring machine is disclosed to have a rectangular hole axially disposed at one end of the axial center through hole thereof for receiving the rectangular head of a screw tap, and a plurality of positioning planes spaced around the periphery thereof corresponding to the clamping elements of the chick of the boring machine for positive positioning.

Abstract: A cutter holder for CNC lathe is disclosed to include a bottom holder block, which is affixed to the frame of a CNC lathe with screws and has a positioning groove with a middle semispherical recess for holding a barrel that holds a tool shank with a front chuck for holding a cutting tool, and a top holding down block, which is detachably affixed to the bottom holder block with screws to hold down the barrel and has a semispherical bottom recess fitting the spherical middle flank portion of the barrel corresponding to the middle semispherical recess of the bottom holder block.