Garage door industry magazine for garage door dealers, garage door manufacturers, garage door distributors, garage door installers, loading docks, garage door operators and openers, gates, and tools for the door industry.
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60 International Door & Operator Industry™ Notice in Figure 5a that the end of the cable should extend 1 times the diameter of the cable from the end of the oval sleeve or stop (tail length). Also notice that when swaging, you start in the center of the sleeve and do the 2nd and 3rd portion in order (see Figure 5b). Based on the diameter of the cable and sleeve or stop being used, there is a correct number of compressions to be applied (see Figure 6). When making the compressions with the swagger, you cannot stop the press half-way. Always close the handles completely for each compression. With all swaggers, comes a gauge that can be used to ensure that the sleeves or stops were compressed correctly. Most pre-made cable assemblies produced at factories in the USA utilize dies for specifc sized cable to produce a machine pressed swage. Murphy Industries has taken this even further by developing proprietary machinery that automatically forms the loop to a specifc size, and produces a consistent swage dimension for every swaged sleeve and stop. INSTALLATION: When installed properly, cable assemblies are very durable and should last a long time. However, cable can be damaged during the installation. Any time cable is damaged during installation, it should not be used. It is important to remember that a cable assembly is a machine with moving parts (wire and strands). If these wires or strands are damaged during installation, the wires and strands are not able to properly operate together. Examples of installation damage include cable that has been crushed or if it develops a kink or "dog-leg" (see Figure 7). A cable can become kinked if it comes off the drum and wraps around the shaft. Remember, the goal of a good swage is to securely attach the sleeve or stop to the cable without damaging the wires or strands of the cable. If the wires or stands are damaged, then you have damaged the moving parts of your cable machine. Cable can also be damaged if it experiences a "shock load" during installation. While a shock load is only momentary, the force is tremendous and the cable is damaged. Remember the old adage: "It's not the fall that kills you, it is the sudden stop at the end." Welding around a cable can also cause damage to the cable. If cable is subject to heat from a welding torch, the cable should not be used. Cable can also be damaged if the technician breaks wires by forcing a loop on to the bottom bracket with a screw driver. All such damaged cable should not be used. Cable damaged during installation often will work when frst installed. However, such cable will prematurely fail due to the damage. We have discussed how wires in a cable must be able to slide and move freely in order for the cable to work properly. Cable can also be damaged if it is installed in such a way that the cable cannot move freely. Accordingly, during installation the cable should be installed in a relaxed state, so avoid applying twist, bind or other pressure during installation. Continued on page 62 Figure 5a - Proper Tail Length Figure 5b - Proper Manual Swage Figure 6 Figure 7 - Damaged Cable TECHNICAL (continued from page 58) 1/24/14 10:54 AM