Compact – Smooth – Accurate. The miniature ball slide type PMM is a compact and robust solution for smooth and accurate linear motion that fits in narrow spaces to transfer light to moderate loads.
The slides were developed for the semiconductor industry and medical devices where they are used for accurate positioning of samples under microscopes.
The slide carriage and center rail consist of high-precision finished table parts with integrated raceways. The specially designed ball cage provides outstanding performance in terms of smoothness and low friction.
Miniature linear slides PMM series are available in three sizes; PMM 05, 1, and 2. Within a size, there are different lengths, varying from 10 mm - 80 mm. The stroke lengths vary between 5 and 70 mm while the dynamic load capacity is 23 N - 429 N.
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Easy mounting and installation in the application is possible through the standard threaded holes in the center rail and the carriage. The slides are pre-lubricated with a small amount of oil and are ready to use.
Engineers can request customized versions of the PMM miniature slides that meet individual requirements, e.g.:
Custom stroke length
Customized slide width – length
Cleanroom or vacuum compatible
Lubrication
Higher load-carrying capacity
Different hole pattern
Specified moving force
Please contact PM’s product specialists for more information.
PMM miniature slides are preloaded without backlash by geometry pairing, using precision balls with a slight oversize of 0.5 microns. This allows the preload and stiffness to be set accurately and guarantees a backlash-free, smooth accurate and repeatable movement.
The four-point contact between the balls and the raceway, the high precision ground raceways, and the design of the ball cage results in a very smooth motion with little friction and low starting force.
Straight-line accuracy and flatness accuracy are depending on size and lengths, they range from 3 – 6 microns for the standard precision class. Higher specifications to be requested.
The carriage and the center rail are made of stainless steel and through-hardened. The ball cage material is stainless steel. The design of the cage, a U-shaped precision strip with ball pockets on both sides, makes it less sensitive to cage creep.
Cage creep or cage migration is a phenomenon whereby the cage slowly creeps out of its original position. In most cases, it happened due to a poor alignment of the slide in the assembly, high speeds/accelerations or in vertical mounting orientations. As the cage creeps away from its centered position it prevents the carriage from reaching its maximum stroke. The design of the cage reduces the risk of cage creep.
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Sizes |
05, 1 and 2 |
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Travel range |
5...70 mm |
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Accuracy |
up to 3 microns/ 30 mm |
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Acceleration |
8 m/s2 |
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Operating temperature |
-40 up to 120 °C |
Miniature slides PMM are used in test rigs, manipulators, microscopy, assembly fixtures, medical instruments and micro-assembly lines. Anywhere the space is limited and accurate, smooth and high reliability is required.
