Page 7 of catalogue Linear bearings of PM Bearings B.V.

Technical Data
General The PrecisieMetaal range of Linear bearings and “almost frictionless” precision slides are available in various sections with matching ball- and roller diameter in a wide range of standard lengths. The choice of sizes (cross-sections) and lengths caters to almost all load capacities, enabling the designer to solve most linear motion problems with virtually frictionfree movements, free from play, with adjustable pre-load. Due to these features PM linear bearings are almost free from wear, needing only minimum lubrication and maintenance, and are used successfully in a wide range of industries, e.g.: Packing machinery Machine Tools + other metal working machinery Automation applications Special purpose Machines + special purpose tooling Due to the high linear accuracy, which PM linear bearings offer, they are also used widely for: Measuring instruments Tool setting equipments Robotic devices Space applications Research projects Semiconductor equipments To sum up, PM linear bearings, have a compact size, offer flexibility of installation, high accuracy of running motion, long life with only minimal lubrication, low maintenance costs, and ease of replacement in the event of damage. Because the linear bearings and linear slides are vital Components in the application they are manufactured with the greatest care to provide the maximum of linear accuracy and reliability.

µ = Coefficient of friction Fn = Normal force F = Frictional resistance Note: wipers and Seals give a negative reaction on the friction.

Lubrication PM precision guides are a main part in the construction of machines. The stand of high quality has to be maintained during the calculated lifetime. Dust and moisture are the main enemies of the precision bearings. Lubrication creates a film between the rolling surfaces and gives a sufficient protection against corrosion. Other benefits are for example: Friction reduction Reduction of wear Prolongation of lifetime Reduction of heat We prefer lubrication by oil CLP like DIN 51519 and HLP like DIN 51524. During operation the temperature has to be between -30°C till +120°C while the viscosity is between ISO-VG15 and ISO-VG100. In case of grease, lubrication on lithium soap base is recommended. By the application of PM precision guides which are manufactured of not standardized materials or used in special operation environments the lubrication has to be taken into account. For further information, please contact PM - BEARINGS.

Friction Friction is the force necessary to move a body along a horizontal plane or track. A finely machined surface gives a positive effect on the friction. Therefore PM is using the highest quality of rollers in combination with precision ground anti-friction guideways type RSD which are manufactured by a team of specialists.

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