Description Precision housing (spheroidal graphite cast iron/steel) Super Linear Bushing A with self-alignment feature Secured with locating screw Integrated wiper seals Product description For long guides requiring shaft support and a high level of rigidity. 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 0.13 0.2 0.36 0.7 1.05 2.05 2.77 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 Shaft radial clearance h6 µm + 28 - 1 + 31 - 2 + 35 - 3 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 1060 1280 2570 4130 5020 8620 12500 C0 1) N 510 630 1180 2250 2880 4480 6620 1) The 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 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 a load of 800 N and misalignment of about 8 ft (caused by shaft deflection). Due to the self-alignment feature, two super Linear Bushings must be used on at least one of the shafts in the guide. FR = Frictional drag s = travel distance v = travel speed a) Super Linear Bushing, A Ød 20 b) Conventional Linear Bushing, Ød 20 Diagrams/charac
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