Description Lightweight precision tandem housing (aluminum) Two Super Linear Bushings A Reference edge External seals Relubricatable Features Also available as Linear Motion Slide. Product description For zero-clearance or preloaded guides. Adjusting screw for adjusting radial clearance. These Linear Sets come set to zero clearance. Technical data General technical data Ø d mm 12 16 20 25 30 40 50 amax m/s² 150 vmax 1) m/s 3 m kg 0.22 0.34 0.62 1.17 1.68 3.15 5.5 FR 2) N 0.8 1 1.5 2 2.5 3 4 Breakaway force N 1.5 2 3 4.5 6 8 10 Radial clearance Comes clamped to h5 shaft (lower limit) and set to zero clearance Operating conditions Permissible ambient temperature (min ... max) -10 °C ... +80 °C 1) Speeds of up to 5 m/s possible. Service life is limited by heightened wear to plastic parts. Tests have shown total travel from 50 • 105 m to 100 • 105 m without failure. 2) Frictional drags generated by Linear Bushings with integrated wiper seals on two sides when not under radial load. The frictional drags depend on speed and lubrication. Load capacities and load moments Ød mm 12 16 20 25 30 40 50 C 1) N 1720 2430 4170 6700 8150 14000 20300 C0 1) N 1020 1660 2360 4500 5760 8960 13240 ML Nm 11 18 60 141 163 328 630 ML0 Nm 7 13 47 86 116 212 415 1) Dynamic load rating when both Linear Bushings are under equal load. The dynamic load ratings apply for the main direction of loading. The load ratings are based on a total travel of 100, 00 m. When based on 50 000 m, the values in the table need to be multiplied by 1.26. Legend Symbol Description Unit Ød Shaft diameters mm amax Maximum acceleration travel m/s2 C Dynamic load capacity N C0 Static load capacity N FR Friction force N m Mass kg ML Dynamic longitudinal moment load capacity Nm ML0 Static longitudinal moment load capacity Nm vmax Maximum permissible speed m/s For load in the direction of opening, please refer to the loading diagrams (see "Diagrams" section). Impact of load direction on load rating of open Linear Bushings The load ratings C and C0 apply for the main direction of loading ρ = 0°. For all other load directions, the load ratings must be multiplied by the factors fρ (dynamic load rating C) or fρ0 (static load rating C0). Installing specific Linear Bushings can prevent reductions in load capacity (see Linear Set with side opening). Reduced load capacity with short stroke In case of short stroke, the service life of the shaft is less than that of the super Linear Bushing. The load ratings C specified in the tables must therefore be multiplied by the factor f.s . 1) fs = factor 2) s = movement path Reduced load capacity with high load If the load F on a Super Linear Bushing A is more than F > 0.5 x C, the dynamic load rating C decreases. Definition of dynamic load ratings Self-alignment feature The self-alignment feature in the steel bearing plates and machined ball guide grooves ensure quieter travel. The flow chart shows a comparison with a conventional Linear Bushing. The example is based on
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