Tech Tips - Compact Air Cylinders Are Still A Big Deal

7 sponsored by: enormous range of options continued TWIN ROD AND TOOLING PLATE DESIGN In Figure 12 below twin piston rods are incorporated into the cylinder head to provide anti-rotation. The rods are securely fastened to the piston and tied together externally by a rod end tool bar. The tooling plate ensures that the rods move in tandem and provides an ideal mounting surface for attachments required by your application. Tool bars are sometimes furnished with threaded mounting holes or optional counter-bored mounting holes. Multiple Piston Offerings Multiple pistons are used to increase thrust force of the cylinder. Multi-Power® (a registered trademark of Fabco-Air, Inc.) air cylinders (A.K.A. - multi-piston cylinders) provide the same output force as much larger bore, single piston cylinders. Higher forces can be achieved in tight spaces versus larger bore cylinders which require a larger footprint and center-to-center space when more than one cylinder is required. This technology has been incorporated into the compact cylinder segment as well. Figure 13A show a 4-stage force-multiplying compact cylinder. Figure 13B shows its extend function in a cross-sectioned view. MULTIPLE POSITIONS TO PROVIDE INTERMEDIATE POSITIONING If the application requires a compact style air cylinder as well as intermediate load position – standard solutions are available. Three or more rod positions can be achieved via a single cylinder! The most popular is the 3-position configuration. Figure 14 shows a cross-sectioned view of an extruded body, 3-position cylinder in which the piston rods are shown partially extended for illustration purposes. The two cylinder bodies are coupled using two socket head cap screws. Piston rod ‘B’ extends through the cap end of the front cylinder and can push Piston ‘A’ as it extends. To set Position #1, imagine that both pistons are retracted; in Position #2 Rod ‘B’ extends moving Rod ‘A’ partially forward; Position #3 is reached when Rod ‘A’ is fully extended. You can see that Rod ‘A’ must be longer than ‘B’ in order to get three discrete positions with your cylinder. figure 13b. 4-piston cylinder figure 14. 3-position cylinder figure 12. twin rod design figure 13A. 4-piston cylinder

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