Tech Tips - Compact Air Cylinders Are Still A Big Deal

figure 9a. side lug figure 9b. foot mount figure 10. internal guide pins 6 sponsored by: enormous range of options continued PIVOT MOUNTING In many applications, the cylinder must be allowed to pivot through an arc. Eye and clevis mounts (Figure 8) as well as trunnion mounts are available on many compact cylinder models. NON-CENTERLINE MOUNTING These mounts are generally quite rugged but in some cases may be less rigid than the previously mentioned mounting types. Because the plane of the mounting surface is not through the centerline of the cylinder, a bending moment is created around the mounting points. None-the-less, side lug (Figure 9A) and foot mounted compact air cylinders (Figure 9B) are sometimes the perfect solution for unique applications. NON-ROTATING For compact air cylinder applications in which anti-rotation and registration are critical, there are solutions. However, please keep in mind that all non-rotating options on compact/ short-stroke cylinders are for light torsional handling and, registration only. Maintaining the rod’s fixed orientation can be accomplished in several ways. DOUBLE-ACTING, SINGLE-ROD (INTERNAL SOLUTION) Figure 10 shows one method used on a bored body cylinder. Two guide pins incorporated inside the cylinder pass through the piston head. These guide pins prevent rotation of the rod with a usual tolerance of ±1°. A rubber disk is included at the end of each guide pin to take up end play and firmly seat the pins in the precision guide pin holes. EXTERNAL CONFIGURATION Another solution uses an external guide block securely attached to the piston rod. One or two steel guide shafts, attached to the guide block, assure anti-rotation of usually less than 0.8°. figure 11. guide blocks