The invention has a turnback roll which can transfer and guide a polishing tap in a tangential direction of a pressure contacting roll, a vertical oscillation mechanism which linearly oscillates the pressure contacting roll in a tangential direction of a ball groove while being orthogonal to a rotating axis line, and a horizontal oscillation mechanism which linearly oscillates the pressure contacting roll in a direction of a rotating axis line toward both inner side surfaces of the ball groove. The ball groove can be securely polished by the polishing tape on the basis of the continuous or intermittent transfer of the polishing tape and the linear oscillating motion of the ball groove. It is possible to improve a polishing precision, it is possible to improve a surface roughness of the ball groove and it is possible to improve a polishing workability of the ball groove.

The invention has a turnback roll which can transfer and guide a polishing tap in a tangential direction of a pressure contacting roll, a vertical oscillation mechanism which linearly oscillates the pressure contacting roll in a tangential direction of a ball groove while being orthogonal to a rotating axis line, and a horizontal oscillation mechanism which linearly oscillates the pressure contacting roll in a direction of a rotating axis line toward both inner side surfaces of the ball groove. The ball groove can be securely polished by the polishing tape on the basis of the continuous or intermittent transfer of the polishing tape and the linear oscillating motion of the ball groove. It is possible to improve a polishing precision, it is possible to improve a surface roughness of the ball groove and it is possible to improve a polishing workability of the ball groove.

The invention has a turnback roll which can transfer and guide a polishing tap in a tangential direction of a pressure contacting roll, a vertical oscillation mechanism which linearly oscillates the pressure contacting roll in a tangential direction of a ball groove while being orthogonal to a rotating axis line, and a horizontal oscillation mechanism which linearly oscillates the pressure contacting roll in a direction of a rotating axis line toward both inner side surfaces of the ball groove. The ball groove can be securely polished by the polishing tape on the basis of the continuous or intermittent transfer of the polishing tape and the linear oscillating motion of the ball groove. It is possible to improve a polishing precision, it is possible to improve a surface roughness of the ball groove and it is possible to improve a polishing workability of the ball groove.

Processing is performed from the front end of a bulb to a connection portion with a shaft along an inclined surface of the bulb, using a rotary tool that is inclined at an angle formed by a connection point of a radius of the shaft with a radius of the bulb and the front end of the bulb; then, processing of the shaft is performed, and a stylus is manufactured.

Processing is performed from the front end of a bulb to a connection portion with a shaft along an inclined surface of the bulb, using a rotary tool that is inclined at an angle formed by a connection point of a radius of the shaft with a radius of the bulb and the front end of the bulb; then, processing of the shaft is performed, and a stylus is manufactured.

A vertical mill machine may be configured to facilitate a process of grinding a thread into a work piece. In one example, the method includes securing a fixture onto a planar surface of a vertical mill machine, the fixture being rotatable. The method further includes securing a work piece to the fixture and rotating the work piece about a Y-axis. The method yet further includes positioning a milling axle configured to move about an X-Y-Z-axis adjacent a circumferential surface of the work piece, wherein the milling axle includes a tool and wherein the tool is configured to rotate about the Y-axis. The method further includes rotating the tool about the Y-axis and contacting the tool with the circumferential surface of an exposed end of the work piece. The method yet further includes grinding a thread into the work piece with the tool.