Method of manufacturing rotary driving device by shaving a surface of a turntable with a cutting tool having a flat cutting edge
View Patent ↗A method of manufacturing a rotary driving device is disclosed. The method includes the steps of: mounting a turntable, which is equipped with an anti-slipping section on a disc-placeable surface, to a rotary shaft; rotating the turntable; and shaving off a disc-contact surface, with which a disc contacts when the disc is placed, of the anti-slipping section with a cutting tool through a cutting off machining method from outside of the disc-placeable surface toward the rotary shaft. A cutting edge of the cutting tool is placed widthwise in parallel with an end face of the anti-slipping section and thickness-wise along an axial direction of the rotary shaft. The cutting edge is set such that the sections of the tool other than the cutting edge do not touch the anti-slipping section.
1. A method of manufacturing a rotary driving device, the method comprising the steps of:
(a) mounting a turntable to a rotary shaft, the turntable being equipped with an anti-slipping section on a disc-placeable surface;
(b) rotating the turntable;
(c) providing a cutting tool having (i) a flat cutting edge substantially orthogonal to (a) an axial direction of the rotary shaft and (b) a longitudinal axis of the cutting tool and (ii) a height substantially parallel to an axial direction of the rotary shaft; and
(d) shaving off a disc-contact surface, with which a disc contacts when the disc is placed, of the anti-slipping section with the cutting tool from outside of the disc-placeable surface toward the rotary shaft,
wherein the flat cutting edge of the cutting tool is placed widthwise in parallel with an end face of the anti-slipping section and thickness-wise along an axial direction of the rotary shaft and the height of the cutting tool increases as the cutting tool extends away from the rotary shaft.
2. The manufacturing method of claim 1 , wherein the anti-slipping section is formed of one of resin and rubber.
3. The manufacturing method of claim 1 , wherein the cutting tool is placed such that a center line of the tool forms a given angle θ 1 with a plane perpendicular to the rotary shaft.
4. The manufacturing method of claim 3 , wherein the given angle θ 1 is set between 1 degree and 2 degrees.
5. The manufacturing method of claim 1 further comprising the step of:
(d) shaving off the disc-contact surface with the cutting tool through the cutting off machining method from the outside of the turntable toward the rotary shaft, wherein the cutting edge is moved along a slope having a downward angle θ 2 with respect to a perpendicular direction to the rotary shaft.
6. The manufacturing method of claim 5 , wherein the given angle θ 2 is set between 0.1 degree and 0.2 degree.
7. The manufacturing method of claim 1 , wherein the cutting tool is shaped like a disc, and the cutting edges are formed on an outer rim of the disc-shaped tool.
8. The manufacturing method of claim 1 , wherein the cutting tool is formed by mounting a plurality of cutting chips on an outer rim of a disc with an interval between the chips.
9. The manufacturing method of claim 1 , wherein the rotary driving device comprising:
the rotary shaft disposed at a center of the turntable;
a rotor frame fixed to the rotary shaft;
a rotor magnet mounted to the rotor frame;
a stator core, on which a stator coil is wound, confronting the rotor magnet;
a bracket holding the stator core; and
a bearing fixed to the bracket and supporting the rotary shaft.
10. The manufacturing method of claim 1 , wherein the disc-contact surface undergoes the cutting off machining after the turntable is integrated into the rotary driving device.
11. The manufacturing method of claim 1 , wherein the cutting off machining is to shave off the anti-slipping section of the disc-placeable surface for correcting vertical deviation of the disc-placeable surface, which vertical deviation occurs while the turntable is rotated.
12. A method of manufacturing a rotary driving device, the method comprising the steps of:
(a) mounting a turntable to a rotary shaft, the turntable being equipped with an anti-slipping section on a disc-placeable surface;
(b) rotating the turntable; and
(c) shaving off a disc-contact surface, with which a disc contacts when the disc is placed, of the anti-slipping section with a cutting tool through a cutting off machining method from outside of the disc-placeable surface toward the rotary shaft, wherein a cutting edge of the cutting tool is placed widthwise in parallel with an end face of the anti-slipping section and thickness-wise along an axial direction of the rotary shaft and the disc-contact surface is shaved off absent rotation about the longitudinal axis of the cutting tool,
wherein the cutting tool is placed such that a center line of the tool forms a given angle θ 1 in the range of about 1 degree to about 2 degrees with a plane perpendicular to the rotary shaft.