A grinder for grinding an end face of a fiber includes a housing, a fiber fixing module, a base, a transmission shaft, and a grinding pad. The housing includes an annular rack wheel with an internal engaging teeth. The fiber fixing module is positioned on a top of the housing. The base is positioned at a bottom of the housing and includes an eccentric connection portion. An end of the transmission shaft is connected to the connection portion. The transmission shaft is sleeved with an annular pinion having external engaging teeth engaging with the internal engaging teeth. The grinding pad is connected to another end of the transmission shaft and revolves around the rotation axis of the base and rotates around its own rotation axis together with the transmission shaft and matches an end face of a to-be-ground fiber penetrating the fiber fixing module.

A battery-operated hand power tool, in particular an eccentric sander, includes at least one electronically commutated electric motor that acts upon an output shaft and that is configured to drive a working tool. The hand power tool further includes at least one motor housing part that accommodates the electronically commutated electric motor. The electronically commutated electric motor and the output shaft define a common first axis that is coaxial with the output shaft. At least one handle region of the hand power tool accommodates at least one set of electronics configured to energize the electronically commutated electric motor. The motor housing part and the handle region are disposed at an angle to each other. The working tool has a diameter that is between 75 and 150 mm, but preferably is between 115 and 125 mm.

A battery-operated hand power tool, in particular an eccentric sander, includes at least one electronically commutated electric motor that acts upon an output shaft and that is configured to drive a working tool. The hand power tool further includes at least one motor housing part that accommodates the electronically commutated electric motor. The electronically commutated electric motor and the output shaft define a common first axis that is coaxial with the output shaft. At least one handle region of the hand power tool accommodates at least one set of electronics configured to energize the electronically commutated electric motor. The motor housing part and the handle region are disposed at an angle to each other. The working tool has a diameter that is between 75 and 150 mm, but preferably is between 115 and 125 mm.

An orbital sander includes a housing, a motor within the housing and having a drive shaft defining a motor axis, an eccentric drive unit coupled to the drive shaft and configured to convert rotation of the drive shaft to an orbit motion around the motor axis, a sanding pad defining a horizontal work plane and coupled to the eccentric drive unit for orbital motion about the motor axis, and a battery receptacle extending along the housing. The battery receptacle is operable to receive a removable battery pack for providing electrical current to the motor. The battery receptacle defines a battery axis along which the battery pack is installed and the battery axis forms an acute battery angle relative to the work plane.

An orbital sander includes a housing, a motor within the housing and having a drive shaft defining a motor axis, an eccentric drive unit coupled to the drive shaft and configured to convert rotation of the drive shaft to an orbit motion around the motor axis, a sanding pad defining a horizontal work plane and coupled to the eccentric drive unit for orbital motion about the motor axis, and a battery receptacle extending along the housing. The battery receptacle is operable to receive a removable battery pack for providing electrical current to the motor. The battery receptacle defines a battery axis along which the battery pack is installed and the battery axis forms an acute battery angle relative to the work plane.

A system for replacing an abrasive sheet in a sanding machine including a working head in which it is provided a support body having an engagement surface arranged to engage with an abrasive sheet. The sanding machine also includes a handling device arranged to actuate the support body in space according to at least two degrees of freedom. The system may include a computing device to compute the spatial orientation of the support body. Furthermore, the system may include a removal station having a gripping element configured to grip the abrasive sheet in order to disengage the abrasive sheet from the support body.

A system for replacing an abrasive sheet in a sanding machine including a working head in which it is provided a support body having an engagement surface arranged to engage with an abrasive sheet. The sanding machine also includes a handling device arranged to actuate the support body in space according to at least two degrees of freedom. The system may include a computing device to compute the spatial orientation of the support body. Furthermore, the system may include a removal station having a gripping element configured to grip the abrasive sheet in order to disengage the abrasive sheet from the support body.

An automatic adjustable stroke device for a random orbital machine has a housing with a central axis and a wall defining a cavity. A counterbalance shaft assembly is rotatably disposed at least partially within the cavity. A shaft portion of the counterweight shaft assemblies aligned with the central axis. A mounting assembly is disposed at least partially within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjuster couples the counterweight shaft with the mounting assembly. The stroke adjuster enables the mounting assembly to adjust its stroke upon rotation of counterweight shaft. The mounting assembly variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing. The stroke adjuster has a gear automatically adjusting the mounting assembly stroke.

An automatic adjustable stroke device for a random orbital machine has a housing with a central axis and a wall defining a cavity. A counterbalance shaft assembly is rotatably disposed at least partially within the cavity. A shaft portion of the counterweight shaft assemblies aligned with the central axis. A mounting assembly is disposed at least partially within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjuster couples the counterweight shaft with the mounting assembly. The stroke adjuster enables the mounting assembly to adjust its stroke upon rotation of counterweight shaft. The mounting assembly variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing. The stroke adjuster has a gear automatically adjusting the mounting assembly stroke.

The present invention relates to a method and an arrangement for grinding spherical products (12), such as e.g. bowling balls, in particular. Such an arrangement comprises at least one grinding machine (1) having a spherically oscillating grinding movement. A fastening plate (6) fitted on the grinding machine has a spherically shaped bearing surface (7) and a grinding product (9) fitted on this, which through its slits (13) adopts a position with accuracy of shape on the spherically shaped surface. The grinding product (9) will form a contact surface (17) in the interface, in which the grinding product cooperates with the spherical product. This contact surface then adopts a radius of curvature arranged to substantially correspond to the radius (r) of the spherical product (12). The grinding is performed with a spherically oscillating grinding movement, which is adapted to the radius of the spherical product and simultaneously coincides with the radius of curvature of the contact surface.