Description Cylindrical single nut with backlash or preload (ZEM-E-S) Product description Planetary Screw Assembly – Definition Rexroth planetary screw assemblies offer design engineers many opportunities to solve transport and positioning tasks with a driven screw. At Rexroth you will be sure to find exactly the kind of tailor-made products you need for special applications. Structural design: Both the screw and the nut have an identical multi-start profile with a flank angle of 90°. The planets have journals at both ends, which are lodged in holes bored in the guide discs. The toothed ends of the planets engage with the internal gear rims of the nut. The planets have single-start threads and crowned flanks that roll without slipping along the nut threads. At each end of the nut there are internally geared rims which engage with the external gearing on the planets. Guide discs inside the gear rims support the planets’ journals and ensure that they are correctly spaced. The discs also prevent coarse dirt from working its way into the nut. Versions: Cylindrical single nut with backlash or preload (ZEM-E-S) Flanged single nut with backlash or preload (FEM-E-S) Precision Screws PSR Bosch Rexroth has a long tradition of manufacturing precision screws. Offered in many sizes and in unmatched quality, these have been an integral part of our ball screw assembly product range for years. We have now transferred this tried and trusted manufacturing technology to the screws of our planetary screw assemblies. For users, this results in many advantages, including the following: Identical quality to Rexroth ball screw assemblies Fast delivery Attractive prices thanks to cost-effective manufacturing Overview of formats ZEM-E-S FEM-E-S Alignment of the screw assembly in the machine A gauge with a self-aligning contact pad is available from Rexroth for the easy alignment of the screw assembly. The dial gauge is not included in the scope of delivery of the screw assembly. Two pads of different lengths are available which can be used depending on the screw lead: Part number R3305 131 19, length 33 mm for leads Part number R3305 131 21, length 50 mm for leads > 20 Overview of screw ends: Screw ends, forms for a left or right screw end Basic version with keyway 002 112 122 132 142 212 222 312 412 512 522 532 542 612 622 712 722 812 822 832 842 912 922 932 942 End machining of end-face Z centering hole DIN 332-D S hex socket Identification system for short product names PLSA / ordering data Planetary screw assembly example PLSA 20x5R FEM-E-S 00 1 0 T7 R 812 A Z 120 412 A Z 120 1250 1 1 Type Planetary screw assembly = PLSA Size Nominal diameter (mm) = 20 Lead (mm) = 5 Direction of lead (R = right-hand) = R Nut type ZEM-E-S Cylindrical single nut FEM-E-S Flanged single nut = FEM-E-S Nut rework 00 without rework = 00 Sealing system 0 Without seal 1 Lip seal = 1 4 Gap-type seal (standard) 5 Wiper Preload class 0 C0 (standard backlash) = 0 1 C2 (average preload) Accuracy T5
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