Page 135 - The Tribology Handbook

bk 23.1 ?he selection of the type of slidewa y Q y comparative performance

Plain Rolling element Hydrostatic
Metallmetal Plasticlmetal Non recirculating Recirculating Liquid Gas

_-
Stroke Any Any Short Any Any' Any'
._
Lubricant Oil, grease, use Oil, grease, dry Oil (oil mist), grease Oil (oil mist), grease Any (non corrosive) Air (clean and dry)
transverse oil
grooves
Load capacity Medium' Medium, high at low Medium (consult Medium, high Can be very high3 Medium low4
speed' maker) (consult maker)
Speed Medium, high6 Medium Any (consult maker) Any (consult maker) Low, medium' Any
Typical friction
I I I

-__
Stiffness High High' High High High (keep h small)' Low, medium (keep h
very small)*
-.___-_____
Transverse Good Good Low, medium Low, medium Good Low, medium
damping varies with varies with
preload preload
Accuracy of linear Good if ways ground Good, beware Virtually that of Virtually that of Excellent, averages Excellent, averages
motion or scraped variation in guideway guideway local geometrical local geometrical
thickness of error^.^ May run errors.' Runs cool
adhesive, etc. warm
Materials Any good bearing Metal is usually CI or Hardened steel (R,60) Hardened steel (R,60) Any" Any"
combination steel with finish guideways guideways
better than 0.25pm (proprietary insert (proprietary insert
c1a9 strips available) strips available)