HepcoMotion
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HepcoMotion PSD80 screw driven linear actuator

Introduction The HepcoMotion® PSD80 is a new screw driven linear unit, which is a companion to the popular and cost-effective PDU2 range of belt driven units, and to the larger PSD120 unit. It shares the PDU2’s use of Hepco Herculane® wheels running inside a profile and is actuated by a stainless steel leadscrew with a bearing quality polymer nut. Ballscrew versions are available on request. The closed unit is fully covered with a stainless steel sealing band. Screw leads of 4, 15, 25 & 70mm are available, meaning that carriage speeds from zero up to ~1m/s are possible without the need for...

FOR AMENDMENTS & UPDATES VISIT www.HepcoMotion.com and select literature button PSD80 linear modules include many useful variants to provide a comprehensive and flexible range.  The closed unit is rugged, tolerant of debris, and has many mounting options  The open version is compact, light, has low friction, and is lower in cost than the closed unit  A “slave axis” without the driving screw is available for both closed and open units  Units may be specified with any number of carriages  A “double acting” version of the unit is available in which two or more carriages move symmetrically...

Cable drag chains PDU2 unit Z axis ■ PSD80 unit X-Y-Z Multi-Axis System The Hepco PDU2 family of products can connect together to make multi-axis systems in a large range of configurations. The example shown has a PDU2 X-axis, a PDU2M Y-axis and PSD80 Z-axis. It is typical of lightweight pick and place units. Each axis has differing requirements for load capacity, stiffness and gearing, and each of the units is perfectly suited for this duty. Hepco will supply complete mechanical systems as shown including all axes, connectors and brackets, cable chains and trays, motor connections, drive...

System Configurations and Applications X-Y Driven Table Hepco PSD80 units can connect together in a number of useful X-Y configurations. The example shown has a PSD80 open X-axis with extra slave carriage, and parallel to this is a PSD80 slave unit again with two carriages. These open units are mounted upside-down such that any debris from the environment will not accumulate in the channel and thus degrade performance. On top of these axes is a simple drilled connecting plate and on top of that is a similar arrangement of PSD80 open units for the Y-axes. The use of open PSD80 units keeps...

The position of the switches and the switch cam on the carriage are easily reversed left to right. The main dimensions of the PSD80 closed unit are shown in the drawing below. Further details can be obtained from the 2D and 3D CAD files, available from www.hepcomotion.com The slave version of this unit is externally identical except it has no screw & shaft and both ends have the same detail as the non-drive end, below. PSD80 closed units are covered by a stainless steel band with contacting seals on the ends and sides of the carriage. This arrangement provides good protection for the unit's...

Data & Dimensions - Open Units PSD80 Open Slave Unit Screw Driven PSD80 Open Unit The main dimensions of the PSD80 open unit are shown in the drawing below. Further details can be obtained from the 2D and 3D CAD files, available from www.hepcomotion.com The slave version of this unit is externally identical except it has no screw & shaft and both ends have the same detail as the non-drive end, below. Beam Length = 2850mm max (6000 for slave units) = stroke length + 215mm PSD80 open units are very compact, being two thirds the height of the covered type. They benefit from lower friction due...

PSD80 Double Acting Closed Unit PSD80 Double Acting Open Unit 193 PSD80 Double Acting Closed Unit All other dimensions of double acting PSD80 units are the same as the units shown |£Q| 5 & 6. PSD80 double acting units have two (or more) carriages whose movements are symmetrical about the middle of the beam, this motion being achieved by using linked left and right hand threaded screws. The units may be ordered with 15, 25 and 70mm screw leads. They share the same major parts, and have the same benefits as other PSD80 units, and are available in both closed and open formats, as well as in a...

How To Order This ordering information is given to assist communication, but we recommend that you discuss the application with Hepco first so that we can help to specify the best unit for your needs. Main Unit Product range = PSD80 L1246 = beam length in mm (max 2850 for standard, 5770 for double acting and 6000 for slave units). T = beam with T-slots (this is the only option at present). Unit configuration: C = Closed; P = Open. Drive type: D = Driven; DA = Double acting; S = Slave; SW = Slave without nut. 25 = Screw lead in mm. Choose from 4, 15, 25 & 70 and also L15, L25 & L70 (left...

Calculations & Performance Carriage Service Interval Calculation After very long service, slight play in the carriage may develop due to wheel wear. This can be corrected by re-adjusting the carriage, which will return the unit to its original condition. Adjustment is quick and simple and may be repeated several times. The table shows the maximum carriage loading, and the calculation below determines the service interval. Note that the life of the nut should also be considered as this may be the determining factor (see C3 10). Hepco will provide more data and calculations for your...

Thrust Load Performance The amount of thrust which a PSD80 unit can produce depends upon the screw lead, the speed, and the life required. As the screw turns faster, the nut's ability to transmit load reduces: For very light loads and occasional rapid movements, shaft speeds of up to 1000rpm are possible, but for sustained loads and higher thrusts it is best to operate at below 600 rpm. Conversely, it is possible to generate substantial thrust loads on an occasional basis and when the speeds are low. The table below gives an indication of typical loadings, but please contact Hepco for...