The cordless power cutter that is lightweight and weight-balanced between a power section housing a battery pack as a power source and a cutting section including a motor in a belt-free drive system and rotatable disk blade. The weight balancing of the cordless power cutter allows the tool to remain parallel to a horizontal surface, such as the ground, without tilting, when the operator lifts and holds the tool by only a gripping or transverse portion of the lifting handle. The motor has a motor axis that is not perpendicular to the disk axis and that is rearward of the disk axis to provide a depth of cut. The weight-balance and motor positioning allows the cordless power cutter to achieve ease of handling and operation.

The cordless power cutter that is lightweight and weight-balanced between a power section housing a battery pack as a power source and a cutting section including a motor in a belt-free drive system and rotatable disk blade. The weight balancing of the cordless power cutter allows the tool to remain parallel to a horizontal surface, such as the ground, without tilting, when the operator lifts and holds the tool by only a gripping or transverse portion of the lifting handle. The motor has a motor axis that is not perpendicular to the disk axis and that is rearward of the disk axis to provide a depth of cut. The weight-balance and motor positioning allows the cordless power cutter to achieve ease of handling and operation.

A portable cutting machine includes an electric motor, a base having a lower surface coming in contact with a workpiece, a cutting machine body coupled to an upper surface of the base and accommodating the electric motor, a handle on a rear portion of the cutting machine body and at least partially rearward from a rear end of the base, a blade on a left or a right of the handle and rotatable with the electric motor, and a battery attachment portion receiving a battery pack for powering the electric motor. The battery attachment portion includes an opening directed away from the blade, an attachment surface standing with respect to the base, and a rail receiver extending in the attachment surface to receive the battery pack in a detachable manner. The battery pack on the rail receiver extends laterally over a center plane of the handle.

An electric powered work machine according to one aspect of to the present disclosure includes a motor. The electric powered work machine includes a first line connecting a positive electrode of a battery to the motor. The electric powered work machine includes a second line connecting a negative electrode of the battery to the motor. The electric powered work machine includes a third line connecting the first line to the second line. The electric powered work machine includes a first capacitor disposed on the third line. The electric powered work machine includes a rectifier disposed on the third line. The rectifier limits or inhibits an electric current flowing from the second line to the first line through the third line. The electric powered work machine includes a first circuit connected to the third line. The first circuit has impedance that is other than zero, and bypasses the rectifier.

An electric powered work machine according to one aspect of the present disclosure includes: a tool; a motor; a manual switch; an electric current path; a shunt resistor; a reference voltage generation circuit; and an electric current measurement circuit. The reference voltage generation circuit (i) generates a reference voltage having a first magnitude in response to a first condition being established, and (ii) generates the reference voltage having a second magnitude in response to the first condition not being established. The electric current measurement circuit (i) receives the reference voltage and a measured voltage, and (ii) outputs an output voltage based on the reference voltage and the measured voltage.

A cutting tool includes an electric motor supported by a housing, an accessory mounting portion including an output member connected to a saw blade, a transmission mechanism connecting the electric motor to the output member, a base plate disposed at the bottom of the housing and having a mounting hole for the saw blade to pass through, a battery pack interface configured to be detachably connected to a battery pack, a liquid storage system including a liquid storage device configured to store a liquid and detachably mounted on the housing, and a system control member disposed on a liquid flow path of the liquid storage system and used for controlling the flow state of the liquid in the liquid storage device. The electric motor is a brushless motor, and a rotational speed of the electric motor is not lower than 7000 revolutions per minute.

A circular saw comprising a shoe including an upper surface and an opposite, lower surface, and a saw unit. The saw unit includes a circular saw blade, a blade guard, and a transparent blade window. The blade guard encloses a portion of the saw blade. The blade guard encloses a portion of the saw blade and has a cutout adjacent a bottom side of the blade guard and a slot above the cutout. The transparent blade window is configured to be received in the cutout to provide a user with a visual indication of the saw blade. The blade window includes a lock tab confined for sliding movement within a first portion of the slot and removable from the slot when aligned with a second portion of the slot to remove the blade window from the blade guard.

A portable circular saw for cutting metal, a dust collection efficiency of cutting dust blown up from a cutting position into a cutting dust collection box is improved. A distance between in inner wall surface of a fixing cover and a tooth tip of a circular saw blade is set to longer than a distance between the tooth tip and a tooth bottom and also longer than twice as long as the distance. Furthermore, a distance between a front end of a window in a base and the tooth tip of the circular saw blade is set longer than the distance between the tooth tip and a tooth bottom and shorter than twice the distance.

An electric circular saw includes a housing, a motor including a motor shaft enabled to rotate about a first rotation axis, and a transmission assembly including a first transmission member and a second transmission member. The motor shaft has a first end and a second end oppositely arranged in a longitudinal direction and the first transmission member is mounted to the second end of the motor shaft. In a coordinate system having an origin defined by a point on a center line of the second transmission member, a positive direction of an X axis defined by a forward direction of the electric circular, and a positive direction of a Y axis defined by an upper side of the electric circular saw, the second end of the motor shaft is arranged in a first quadrant of the coordinate system.

A controller 50 that controls a power tool such as, for example, a portable circular saw includes a controller case 70 that houses an electric circuit board 60. Electric elements 61, 62 that generate heat and/or are to be cooled on the electric circuit board 60 contact a thick wall portion 73b of the controller case 70, resulting in heat dissipation resulting in effective cooling of the controller 50.