A method to fabricate a fluid bearing spindle includes creating a hollow cylindrical bore through a solid workpiece. The hollow cylindrical bore has a journal bearing portion including first and second distal tapered bearing segments separated by a central bearing segment having a constant radius. Each of the first and second distal tapered bearing segments has a tapered bearing radius that increases with distance from the central bearing segment to a maximum tapered bearing radius that is in the range of 0.5 microns to 1.5 microns greater than the constant radius. Subsequently, a cylindrical spindle shaft is inserted into the hollow cylindrical bore. In an alternative embodiment, a cylindrical outer surface of the spindle shaft includes the tapered bearing segments, rather than the hollow cylindrical bore.

A ball bearing cage includes a plurality of ball pockets, wherein each ball pocket serves for receiving a ball, wherein each ball pocket (12, 22) has a width (B) in axial direction of the ball bearing cage (10, 20) and a length in circumferential direction of the ball bearing cage (10, 20), with the width (B) being slightly greater than a diameter of the ball (30), wherein the length is greater than the width (B) of the ball pocket (12,22) at least at an outer circumference (U.sub.A) of the ball bearing cage (10), and the length (L.sub.A) of the ball pocket (12,22) at the outer circumference (U.sub.A) of the ball bearing cage (10) is greater than the length (L.sub.I) of the ball pocket (12,22) at the inner circumference (U.sub.I) of the ball bearing cage (10,20).

An inner sliding surface for a radial plain bearing, including four circle arcs in at least one cross section. A first arc and a second arc of the four circle arcs lie on different sides of a longitudinal sectional plane which intersects a third arc of the four circle arcs, a fourth arc of the four circle arcs and a common center point of the third arc and the fourth arc. The first arc and a center point of the first arc lie on different sides of the longitudinal sectional plane, and the second arc and a center point of the second arc lie on different sides of the longitudinal sectional plane.

A plain bearing sleeve includes an inner diameter, a sleeve length greater than the inner diameter, an outer diameter, and a wall thickness smaller than 8% of the inner diameter. A sleeve blank includes a longitudinal axis, an outer surface, an inner surface, a first end face, a second end face opposite the first end face, and at least three threaded holes arranged on the first end face. A method for producing the plain bearing sleeve includes clamping the outer surface at the first end face for rotation, machining the inner surface to the inner diameter, fixing the first end face at the at least three threaded holes for rotation, machining the outer surface to the outer diameter, clamping the inner surface at the second end face for rotation, and cutting a ring with the first end face and the at least three threaded holes from the sleeve blank.

Disclosed is a torque limiter having driver mandrel and driven axially aligned mandrels, a piston movable into and out of an engaged position wherein the driver and driven mandrels are coupled together to transmit torque there between. Hydraulically locking the movable piston in an engaged position. Disengaging the hydraulic lock when during rotation when a specified torque magnitude is exceeded to allow relative rotation between the mandrels. Resetting the torque limiter by hydraulically locking the piston in the engaging position when relative rotation ceases or is reduced.

A rolling bearing, in particular a ball bearing, in particular for use in a surgical instrument, which is designed for forwarding or transmitting electrical signals and has for this purpose at least one signal line or signal path integrated in the rolling bearing. A sleeve, in particular for use in a surgical instrument, is designed for forwarding or transmitting electrical signals and has for this purpose at least one signal line or signal path integrated in the sleeve. A surgical instrument, in particular a hand-held milling cutter, includes at least one ball bearing and at least one sleeve, each having a respective method of production.