A controller of a cutting apparatus includes: a storage section configured to preliminarily store as a threshold an arbitrary value based on a load current value of a motor detected when a cutting blade is rotated at a predetermined rotational speed while supplying a predetermined quantity of cutting water in a state in which a cutting water supply nozzle is positioned in an appropriate position; and a judgment section configured to judge normality or abnormality according to the result of comparison between a load current value detected when the cutting blade is rotated at the predetermined rotational speed while supplying the predetermined quantity of cutting water and the threshold stored in the storage section.

A cutting method and an apparatus are provided which enable a rim area or other part of a vitreous silica crucible to be cut off so as to leave a smooth cut surface without damaging the cut edge, etc. The apparatus for cutting the crucible comprises a disk-shaped cutting blade (10) disposed to be movable with respect to the crucible. Without rotating the crucible (20), the rotating cutting blade (10) is brought into contact with a surface of the crucible wall and pushed forward in the wall thickness direction to make a cut piercing the crucible wall. The cutting blade (10) is moved relatively to the crucible (20) in the circumferential direction of the crucible (20) while keeping the cutting blade in the state of piercing the wall. A rim area (25) of the crucible (20) is thus cut off.

A cutting method and an apparatus are provided which enable a rim area or other part of a vitreous silica crucible to be cut off so as to leave a smooth cut surface without damaging the cut edge, etc. The apparatus for cutting the crucible comprises a disk-shaped cutting blade (10) disposed to be movable with respect to the crucible. Without rotating the crucible (20), the rotating cutting blade (10) is brought into contact with a surface of the crucible wall and pushed forward in the wall thickness direction to make a cut piercing the crucible wall. The cutting blade (10) is moved relatively to the crucible (20) in the circumferential direction of the crucible (20) while keeping the cutting blade in the state of piercing the wall. A rim area (25) of the crucible (20) is thus cut off.

A portable cutting machine is provided. The portable cutting machine comprises: a cutting portion including a disc-shaped cutting blade that cuts an object to be cut by rotating, and a first rotation axis that serves as a rotation center of the cutting blade; a drive portion including a drive source and a second rotation axis rotating by drive of the drive source; a transmission portion including a first pulley fixed to the first rotation axis, a second pulley fixed to the second rotation axis, and a belt looped around the first pulley and the second pulley, and configured to transmit a rotational force by the drive portion to the cutting portion; and a case including a storage space for storing the transmission portion and at least one communication portion that connect to the storage space and open to outside.

A portable cutting machine is provided. The portable cutting machine comprises: a cutting portion including a disc-shaped cutting blade that cuts an object to be cut by rotating, and a first rotation axis that serves as a rotation center of the cutting blade; a drive portion including a drive source and a second rotation axis rotating by drive of the drive source; a transmission portion including a first pulley fixed to the first rotation axis, a second pulley fixed to the second rotation axis, and a belt looped around the first pulley and the second pulley, and configured to transmit a rotational force by the drive portion to the cutting portion; and a case including a storage space for storing the transmission portion and at least one communication portion that connect to the storage space and open to outside.

A lateral support device includes a fixed seat mounted to a worktable, a lateral support plate having a sliding groove, and a pivot seat pivoted to the fixed seat and having a pressing portion arranged adjacent to the lateral support plate. A lock assembly has a pressing plate disposed to the pivot seat and arranged adjacent to the lateral support plate, a threaded rod threaded with the pressing plate through the pressing portion and the sliding groove, and a handle fixed to one end of the threaded rod. When the handle is locked, the lateral support plate is forced tightly and cannot be moved, and when the handle is unlocked, the lateral support plate is released and can be moved relative to the worktable for adjusting its position. Thus, the present invention provides lateral support to workpieces of different sizes for improving issues with incomplete cross-sections.

A lateral support device includes a fixed seat mounted to a worktable, a lateral support plate having a sliding groove, and a pivot seat pivoted to the fixed seat and having a pressing portion arranged adjacent to the lateral support plate. A lock assembly has a pressing plate disposed to the pivot seat and arranged adjacent to the lateral support plate, a threaded rod threaded with the pressing plate through the pressing portion and the sliding groove, and a handle fixed to one end of the threaded rod. When the handle is locked, the lateral support plate is forced tightly and cannot be moved, and when the handle is unlocked, the lateral support plate is released and can be moved relative to the worktable for adjusting its position. Thus, the present invention provides lateral support to workpieces of different sizes for improving issues with incomplete cross-sections.

A working machine may include: an output shaft; a rotary blade attached to the output shaft; a prime mover configured to rotate the output shaft; a housing that houses the prime mover and rotatably supports the output shaft; and a blade cover attached to the housing. The sidewall of the blade cover may include a first stopper and a second stopper. The facing portion of the housing may include a first stopper receiver and a second stopper receiver. When the blade cover is pivoted in a first pivot direction of the blade cover, the first stopper may contact the first stopper receiver. When the blade cover is further pivoted in the first pivot direction from a state where the first stopper is in contact with the first stopper receiver, the second stopper may contact the second stopper receiver.

A measuring seat for a sintered stone cutting machine is disposed on a sintered stone cutting machine and has a positioning arm. The sintered stone cutting machine has a track base and a cutter. The cutter is movably disposed on the track base and has a cutting wheel. The positioning arm extends outwardly and downwardly adjacent to a bottom of the track base, is located at a same side of the track base as the cutting wheel, and has a reference board formed on a free end of the positioning arm. The reference board has an external side face. An imaginary extension line of the external side face of the reference board is in a straight line with a cutting edge of the cutting wheel.

A measuring seat for a sintered stone cutting machine is disposed on a sintered stone cutting machine and has a positioning arm. The sintered stone cutting machine has a track base and a cutter. The cutter is movably disposed on the track base and has a cutting wheel. The positioning arm extends outwardly and downwardly adjacent to a bottom of the track base, is located at a same side of the track base as the cutting wheel, and has a reference board formed on a free end of the positioning arm. The reference board has an external side face. An imaginary extension line of the external side face of the reference board is in a straight line with a cutting edge of the cutting wheel.