Compound miter saw

A compound miter saw comprising:

• a base;
• a turntable supported on the base so as to be rotatable in a horizontal plane relative to the base;
• a cutting-machine main body disposed upward of the turntable and rotatably supporting a cutting tool;
• a turntable-fixing mechanism comprising a first knob configured to be manually rotated and a fixing rod connected to the first knob so as to rotate therewith, the turntable-fixing mechanism being configured to fix rotation of the turntable relative to the base to set a miter cutting angle;
• a support arm tiltably connected to a rearward side of the turntable and supporting the cutting-machine main body so as to be tiltable in clockwise and counterclockwise directions relative to the turnable to set a bevel cutting angle;
• and
• a tilt-fixing mechanism comprising a second knob configured to be manually rotated, a rotary shaft connected to the second knob so as to rotate therewith and a transmission shaft operably coupled to the rotary shaft, the tilt-fixing mechanism being configured to fix the bevel cutting angle of the cutting tool;
• wherein:
• the first knob and the second knob are disposed forward of a front end surface of an extension arm of the turntable, downward of an upper surface of the turntable, and at a center of the extension arm in a left-right direction;
• the fixing rod extends through and coaxially with the rotary shaft;
• and
• the second knob is disposed between the first knob and the front end surface of the extension arm.

A compound miter saw comprising:

• a base;
• a turntable supported on the base so as to be rotatable in a horizontal plane relative to the base;
• a cutting-machine main body disposed upward of the turntable and rotatably supporting a cutting tool;
• a turntable-fixing mechanism comprising a first knob configured to be manually rotated and a fixing rod connected to the first knob so as to rotate therewith, the turntable-fixing mechanism being configured to fix rotation of the turntable relative to the base to set a miter cutting angle;
• a support arm tiltably connected to a rearward side of the turntable and supporting the cutting-machine main body so as to be tiltable in clockwise and counterclockwise directions relative to the turnable to set a bevel cutting angle;
• and
• a tilt-fixing mechanism comprising a second knob configured to be manually rotated, a rotary shaft connected to the second knob so as to rotate therewith and a transmission shaft operably coupled to the rotary shaft, the tilt-fixing mechanism being configured to fix the bevel cutting angle of the cutting tool;
• wherein:
• the first knob and the second knob are disposed forward of a front end surface of an extension arm of the turntable, downward of an upper surface of the turntable, and at a center of the extension arm in a left-right direction;
• the fixing rod extends through and coaxially with the rotary shaft;
• the second knob is disposed between the first knob and the front end surface of the extension arm;
• the transmission shaft extends straight in a front-rear direction from a front portion of the extension arm to the support arm without intersecting a center of rotation of the turntable;
• the rotary shaft is configured as a drive-shaft gear having a hollow interior;
• the tilt-fixing mechanism further comprises a follower-side gear connected to the transmission shaft so as to rotate therewith, the follower-side gear meshing with the drive-shaft gear;
• a threaded shaft end is defined on a rear portion of the transmission shaft;
• a nut is threadably mounted on the threaded shaft end;
• and
• the second knob, the drive-side gear, the follower-side gear, the transmission shaft and the nut are configured such that manual rotation of the second knob in one rotational direction causes the transmission shaft to rotate about its axis and tighten the nut on the threaded shaft end to generate a clamping force that clamps the support arm against a rearward portion of the turntable.

A compound miter saw comprising:

• a turntable that is selectively rotatable relative to a base to set a miter angle, the turntable having an extension arm;
• a carriage rotatably supporting a miter saw blade and being both pivotable and tiltable relative to the turntable;
• a miter angle locking mechanism comprising a fixing rod that is rotatably and axially displaceably supported by the extension arm and is manually rotatable by a first knob;
• and
• a bevel angle locking mechanism comprising a hollow sleeve that is rotatably supported by the extension arm and is manually rotatable by a second knob;
• wherein:
• the fixing rod extends coaxially through the hollow sleeve and the second knob;
• the second knob is disposed closer to a terminal end of the extension arm than the first knob;
• the second knob has a larger outer diameter than the first knob;
• a vertical plane is defined by pivoting movement of the miter saw blade perpendicular to an upper surface of the turntable;
• the vertical plane intersects the fixing rod and the hollow sleeve;
• and
• wherein the bevel angle locking mechanism is configured such that:
• rotation of the second knob in a first rotational direction locks the bevel angle of the miter saw blade relative to the turntable;
• and
• rotation of the second knob in a second rotational direction, which is opposite of the first rotational direction, releases the bevel angle of the miter saw blade relative to the turntable.