Friction - Import export

The resistance generated by the seal (if present), depending on the surface finish of the outside diameter of the inner ring, as well as of the rotational speed. The resistance generated by the cage, depending on the geometrical form and the machining quality of the cages. The resistance generated by the lubricant, depending on the lubricant viscosity and filling quantity as well as the rotational speed. At low speed and with fine instrument oil this resistance is insignificant. It will be higher at low temperatures and at high viscosity of the lubricant. Grease lubricated bearings will show, according to the grease type and filling, a much higher friction torque than oil lubricated bearings.

MPS Microsystems offers a wide range of linear bearings that provide smooth movement. Another advantage of these guidance systems: their attractive price. They are available in a range of diameters from Ø 3 mm to Ø 25 mm and are made of injected plastic segments (POM), as well as easy-to-clean stainless steel needles and balls. The needles have three roles: they hold the segments together, they serve as external tracks for the balls, and they define the diameter of the ball bushing. The plastic segments of MPS Microsystems DBL series linear bearings enable their use in environments with high temperature fluctuations.

MPS Microsystems is specialized in manufacturing high-precision, miniature linear bearings. We offer a comprehensive range of exceptionally smooth bearings with bore diameters from Ø 2 mm to Ø 6 mm. The balls of these precision bearings meet ‘Grade 3’, the highest quality defined by the ISO 3290/DIN 5401 standard. Combined with a cage and a high precision casing, they allow rapid positioning while reducing friction and eliminating the stick-slip effect. The standard version of MPS Microsystems linear bearings consists of a stainless steel bushing and balls, and a brass cage. An all-stainless steel version or one with ceramic balls can be made on request.

Magtrol’s Cogging Test System is a stand-alone test system designed to control and measure Detent Torque, Cogging Torque and Friction Torque. The test System includes a precision geared motor, a TS Series Torque Sensor integrating a 5 000 pulses encoder. CTS 100 to CTS 102 have a built-in security clutches to avoid system overload by mishandling when not in use. The geared motor drives the MUT (Motor Under Test) at a low speed from 1 to 10 rpm (respectively 8 rpm for CTS 103 and CTS 104), while acquiring its cogging torque related to angle position. The torque measurement covers a range up to 1 N∙m (depending on the selected torque sensor) with an accuracy of ± 0.1 mN∙m (for TS 100 – 50 mN∙m and TS 101 – 100 mN∙m). The executable software controls the system and displays acquired data. It provides accurate peak-to-peak measurement of cogging torque and displays X-Y or polar graphs as well as FFT analysis. ... more information www.magtrol.com