Linear bearings offer high load ratings
A
Micromech product story
Edited by the Engineeringtalk editorial team
Jul 5, 2007
Micromech's RSDE linear bearings offer higher load ratings and stiffness without changing the envelope dimensions.
The RSDE linear bearings from Micromech are based on the conventional crossed roller linear version but thanks to the deeper ground V-groove in combination with special designed cylindrical rollers, offer higher load ratings and stiffness without changing the envelope dimensions.
The construction comprises of two pairs of opposing linear bearings; each pair consisting of two similar 90 degree V-groove guideways that are 'through-hardened' and precision ground, with crossed rollers held within a cage between the guideways.
The main feature achieved by this is that the load capacity is approximately three times higher than conventional bearings.
This also produces a second major benefit whereby the stiffness is doubled, due to the enlarged contact area of the running surface.
The RSDE has an approximate 80% stiffness factor compared with 35% for conventional types.
The compact design prevents dust and dirt from entering the inside of the roller-ways as the space between the roller-ways is reduced to a minimum.
Roller sizes are 3, 4, 6, and 9mm, guideway lengths range from 50 to 1200mm and the guideway attachment holes are countersunk-bored to a standard pitch configuration.
They are manufactured to extremely close tolerances, 2microns over the full guideway length; the reduction of surface roughness is 0.05Ra so that the V-groove has a visual mirror smooth finish.
This means vibrations in the sub-micron range are substantially reduced as well as friction, resulting in smooth running linear motion.
These accurate but ruggedly built bearings will accommodate higher speeds and accelerations and therefore can be used in highly-dynamic applications requiring high speed, high running accuracy and outstanding quality.
This makes the RSDE most suitable for the semiconductor industry, measuring devices and material testing equipment.
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