NSK says its PU series miniature precision linear guides are around 20%
lighter than conventional equivalents and, thanks to their resin
recirculation circuits, are considerably smoother and quieter in
operation. This latter feature ensures a softer contact between the steel
balls and recirculation holes, resulting in improved dynamic friction
characteristics and smoother motion of the slider on the
The lack of metal-to-metal contact also means that the PU guide produces
less dust, making it a suitable option for clean room applications. Where
dust ingress is a problem, there are also side seals to both faces of the
ball slide, plus added protection in the form of a labyrinth structure on
the bottom face of the ball slider, providing the equivalent of an
underseal for the guide.
PU guides are manufactured to four accuracy standards, from
ultra-precision to semi-precision, and are available with rail widths of
9, 12 and 15mm, and rail lengths from 600 to 1,000mm. The maximum dynamic
load capacity ranges from 1,180N to 4,300N.