Tabletop cutting machine

1. A cutting machine, comprising:

a base;

a rotation support shaft;

a turntable (i) supported in a manner rotatable horizontally to the base around the rotation support shaft and (ii) including

a substantially disk-shaped table body configured to receive a workpiece, and

a table extension protruding forward from the table body;

a cutting machine body above the turntable and connected in a manner swingable vertically to the turntable; and

a fine angle adjuster configured to adjust a rotation angle of the turntable with respect to the base, the fine angle adjuster including

a rack on the base,

a pinion that (i) overlaps the table body as viewed from above and (ii) is configured to engage the rack, and

a rotational shaft (i) including an operation part that is configured to rotate the pinion and (ii) extending parallel to the rotation support shaft,

wherein the pinion is coaxial with the rotational shaft.

2. The cutting machine according to claim 1 , wherein

the pinion is configured to move in an extending direction of a rotation axis of the pinion between an engagement position at which the pinion is engaged with the rack and a release position at which the pinion is disengaged from the rack.

3. The cutting machine according to claim 1 , wherein

the rack includes

an arc-shaped rack body, and

a plurality of teeth (i) protruding from the rack body toward a radial center of the rack body and (ii) spaced circumferentially along the rack body, and

the pinion has a rotation axis parallel to the radial center of the rack body.

4. The cutting machine according to claim 2 , further comprising:

a spring configured to urge the pinion from the engagement position toward the release position.

5. The cutting machine according to claim 1 , wherein

the pinion and the operation part are above a rear area and at an outer periphery of the table body.

6. The cutting machine according to claim 1 , wherein

the table body includes

a right front wall rightward from the table extension and standing vertically along an outer peripheral edge of the table body, and

a left front wall leftward from the table extension and standing vertically along the outer peripheral edge of the table body, and

the operation part protrudes radially outward from at least one of the right front wall or the left front wall.

7. The cutting machine according to claim 6 , wherein

the operation part includes

a first operation part protruding radially outward from the right front wall, and

a second operation part protruding radially outward from the left front wall, and

the pinion includes

a first pinion rotatable integrally with the first operation part, and

a second pinion rotatable integrally with the second operation part.

8. The cutting machine according to claim 6 , wherein

the rack includes

an arc-shaped rack body facing upward or downward, and

a plurality of teeth protruding upward or downward from the rack body and spaced along the rack body,

the plurality of teeth and the pinion are bevel gears, and

the pinion is radially movable from the rack to be disengaged from the rack.

9. The cutting machine according to claim 6 , wherein

the pinion and the operation part are integral with each other to rotate integrally.

10. The cutting machine according to claim 1 , further comprising:

a reduction mechanism (i) between the pinion and the rack and (ii) configured to reduce a rotational speed of the pinion for transmitting rotation of the pinion to the rack.

11. The cutting machine according to claim 1 , wherein

the fine angle adjuster includes a clutch mechanism configured to disable transmission of power for rotating the turntable with respect to the base when receiving a predetermined torque or greater.

12. The cutting machine according to claim 10 , wherein

the fine angle adjuster includes a clutch mechanism configured to disable transmission of power for rotating the turntable with respect to the base when receiving a predetermined torque or greater,

the reduction mechanism includes

a first shaft rotatable integrally with the operation part, and

a second shaft configured to rotate at a lower speed than the first shaft, and

the clutch mechanism is in the second shaft.

13. The cutting machine according to claim 12 , wherein

the clutch mechanism includes a first cam and a second cam engageable with each other to enable power transmission and disengageable from each other to disable power transmission, and

the second cam is integral with the pinion engageable directly with the rack.

14. The cutting machine according to claim 2 , wherein

the rack includes

an arc-shaped rack body, and

a plurality of teeth (i) protruding from the rack body toward a radial center of the rack body and (ii) spaced circumferentially along the rack body, and

the pinion has a rotation axis parallel to the radial center of the rack body.

15. The cutting machine according to claim 3 , further comprising:

a spring configured to urge the pinion from the engagement position toward the release position.

16. The cutting machine according to claim 2 , wherein

the pinion and the operation part are above a rear area and at an outer periphery of the table body.

17. The cutting machine according to claim 3 , wherein

the pinion and the operation part are above a rear area and at an outer periphery of the table body.

18. The cutting machine according to claim 4 , wherein

the pinion and the operation part are above a rear area and at an outer periphery of the table body.

19. The cutting machine according to claim 2 , wherein

the table body includes

a right front wall rightward from the table extension and standing vertically along an outer peripheral edge of the table body, and

a left front wall leftward from the table extension and standing vertically along the outer peripheral edge of the table body, and

the operation part protrudes radially outward from at least one of the right front wall or the left front wall.