Miter saw

1. A miter saw, comprising:

a base having a plurality of grooves formed in a bottom surface thereof;

a table rotatable with respect to the base;

a rotary indexing mechanism including a body fixedly coupled to and rotatable with the table and a protrusion provided on the body, the protrusion configured to be received within one of the plurality of grooves of the base and thereby angularly index the table with respect to the base at a desired rotational position;

a locking mechanism operably coupled to the table and configured to lock the table at the desired rotational position; and

a support structure, the rotary indexing mechanism and the locking mechanism both fixedly coupled to the table via the support structure,

wherein the body of the rotary indexing mechanism is a retaining blade, the retaining blade having one end fixedly connected to the support structure,

wherein the rotary indexing mechanism further includes a blade drive mechanism disposed in vicinity of the retaining blade and configured to drive the retaining blade to move between a first position at which the retaining blade causes the protrusion to be received in one of the plurality of grooves of the base, and a second position at which the retaining blade causes the protrusion to move out of the one of the plurality of grooves, and

wherein the blade drive mechanism includes a indexing cam facing the retaining blade and a cam handle; the cam handle extends through the indexing cam and is in rotary connection with the support structure; and the cam handle drives the indexing cam to rotate and push the retaining blade to move between the first and second positions.

2. The miter saw of claim 1 , wherein the cam handle includes a shaft and the indexing cam defines a bore; the shaft extends through the bore and is in rotary connection with the support structure; and both the shaft and the bore have a non-circular radial cross section.

3. The miter saw of claim 2 , wherein along an axial direction of the shaft, the indexing cam is located between the support structure and the cam handle; a resilient retaining ring is located between the support structure and the indexing cam; and a resilient corrugated retaining ring is located between the indexing cam and the cam handle.

4. The miter saw of claim 1 , wherein the locking mechanism includes a locking pin which extends through a bore in the support structure and comes in contact with an outer circumstantial surface of the base; and a friction force between one end face of the locking pin and the outer circumstantial surface of the base causes the table to be locked.

5. The miter saw of claim 4 , wherein the locking mechanism further includes a locking handle and a friction sheet; the locking handle has a locking cam fixedly disposed thereon; the other end face of the locking pin is in contact with the friction sheet; and when the locking handle rotates, the locking cam synchronously pushes the friction sheet and thereby causes the locking pin to make contact with the outer circumstantial surface of the base.

6. The miter saw of claim 5 , wherein the locking handle is in rotary connection with the support structure by a rotary pin.

7. The miter saw of claim 5 , wherein the locking mechanism further includes a spring disposed along an axis direction of the locking pin and between the locking pin and the friction sheet; the spring has one end fixedly connected to the locking pin and the other end connected to the friction sheet by an open ring.

8. The miter saw of claim 4 , wherein axes of the bore and locking pin both extend along a radial direction of the outer circumstantial surface of the base.