Abstract: A ball bearing cage has a radially encircling, annular body, on which in the circumferential direction, substantially evenly distributed, axially projecting webs having a predefinable axial length are arranged. The webs form a plurality of axially open ball pockets on one side for accommodating a corresponding number of balls having a predefinable ball diameter. At least for one web, a guide section is formed to bring same into an engagement with a running groove of a ball bearing ring. The axial length of the webs corresponds to at least the ball diameter. There is also described a ball bearing having such a ball bearing cage.

Abstract: A two-part ball bearing cage includes two, in particular at least substantially identical, cage parts forming an even-numbered plurality of ball pockets for receiving a corresponding number of balls having a predeterminable ball diameter. Each cage part has an annular body on which substantially evenly distributed webs are disposed in the circumferential direction to form the ball pockets. A distance in the circumferential direction between two webs that are adjacent in the circumferential direction approximately corresponds to the sum of twice the ball diameter and a width of the web in the circumferential direction. A ball bearing having the ball bearing cage and a method for assembly of the ball bearing are also provided.

Abstract: The dental handpiece consists of a housing with a handle and a turbine that can be operated with compressed gas or compressed air. The rotational movement of the turbine driven by compressed gas is transmitted to the dental tool via a rotor shaft and a chuck. The rotor shaft is rotatably supported by at least one axial groove ball bearing. The radial rigidity required for operating a dental handpiece is achieved by axially preloading the ball bearings. Projections on the housing and the shaft disc of the at least one axial groove ball bearing allow the axial groove ball bearing to be used as radial groove ball bearings. The proposed design of the dental handpiece exhibits little power loss or frictional loss in comparison to dental handpieces with radial groove ball bearings, and slip and drilling friction components can be virtually completely prevented in particular.

Abstract: A ball bearing cage has a radially encircling, annular body, on which in the circumferential direction, substantially evenly distributed, axially projecting webs having a predefinable axial length are arranged. The webs form a plurality of axially open ball pockets on one side for accommodating a corresponding number of balls having a predefinable ball diameter. At least for one web, a guide section is formed to bring same into an engagement with a running groove of a ball bearing ring. The axial length of the webs corresponds to at least the ball diameter. There is also described a ball bearing having such a ball bearing cage.

Abstract: A two-part ball bearing cage includes two, in particular at least substantially identical, cage parts forming an even-numbered plurality of ball pockets for receiving a corresponding number of balls having a predeterminable ball diameter. Each cage part has an annular body on which substantially evenly distributed webs are disposed in the circumferential direction to form the ball pockets. A distance in the circumferential direction between two webs that are adjacent in the circumferential direction approximately corresponds to the sum of twice the ball diameter and a width of the web in the circumferential direction. A ball bearing having the ball bearing cage and a method for assembly of the ball bearing are also provided.

Abstract: An accelerometer is supported on a print head assembly to determine actual acceleration, and a computer system is used to obtain and store information about error in movement along a specified axis. The method used is to activate a motor for a selected axis at a particular location, then calculate an expected acceleration. The next step is to measure the actual acceleration data and then compute error data. Following that is a step to store error data in the memory as a function of position and error. These steps are repeated for N locations along each specified axis. Then, this error data is referred to during actual printing operations to reduce error.

Abstract: A 3D printer has a casing, a nozzle for printing, an extruder, a heating element, and a print bed. The casing encloses a region above and around the print bed to form a printing zone. The apparatus has a plurality of micro motors for controlling movement of the nozzle during printing. Further, the 3D printer has safer components as compared with the prior art, ideal for use in home and education situations, and includes a rounded edge design of the printer, an improved small and enclosed area of the printer heating element, and a lower power system, reducing the risk of electrical shock.

Abstract: A nozzle and cover for use in 3D printing, including a nozzle body having a relatively flattened end; a nozzle tip protruding a small distance from the flattened end; a disk of material surrounding the nozzle tip, the disk being in contact with the flattened end; and wherein the disk of material prevents sticking of plastic and thereby prevents charring. The device further includes providing the disk of material being composed of PTFE or silicone.

Abstract: A 3D printer has a casing, a nozzle for printing, an extruder, a heating element, and a print bed. The casing encloses a region above and around the print bed to form a printing zone. Further, the 3D printer has features adapted for low-noise operation, and is already suitably quiet enough for use in a low-noise environment because it does not generate loud sounds. Specifically, in a quiet office with 37-38 dB of noise, noise emissions were measured while the present invention constructed a 3D printed model, and at six inches from the extruder on the 3D printer, the noise emissions measured 39-58 dB, at three feet away measured 38-43 dB, and at six feet away measured around 37-40 dB.

Abstract: A printbed for 3D printers and 3D printed objects has a hole size and thickness that facilitates release of the printed object, that is sufficiently strong to provide a stable base, and that does not cause warping of the printed object either during printing or during release of the object from the printbed.