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Figure 9.5 Masterkeying by the numbers.
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The master key combination can be set up fairly easily now. The chart in Fig. 9.5 is for ten-lever locks, each with five levers with five possible key depths per lever. The master key for these locks will have a 21244 cutting code. Suppose the tumblers in the first position have depths of 1, 2, 3, and 5. You must file depths 1 and 3 wider to allow the depth 2 cut of the master key to enter. The tumbler with the depth 5 cut requires a separate cut, or double gating. It needs a cut that will align it properly at two positions. From position 2 on the chart, we see that four levers must be cut; all of these require a double-gating cut. In position 3, four require a double-gating cut and one needs widening. In position 5, only one requires another gating and four require widening at the current gate. Another masterkeying method is to have what is known as a master-tumbler lever in each lever lock. The master tumbler has a small peg fixed to it that passes through a slot in the series tumblers. The master key raises the master tumbler. The peg, in turn, raises the individual change tumblers to the
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proper height so the bolt post passes through the gate in each lever. The lock is open. This system should be ordered from the manufacturer. The complexities of building one yourself require superhuman skill and patience. Masterkeying Disc Tumbler Locks Disc tumbler locks have as few as three discs and as many as twelve or more. The most popular models have five. Figure 9.6 shows how the tumbler is modified for masterkeying. The left side of the tumbler is cut out for the master; the right side responds to the change key. The key used for the master is distinct from the change key in that its design configuration is reversed. The cuts are, of course, different. The keyway in the plug face is patterned to accept both keys. Since the individual disc tumblers are numbered from 1 to 5 according to their depths, it is easy to think of the master key and disc cuts on a 1 to 5 scale, but on different planes for both the key and the tumblers. Uniform cuts are taboo. The series 11111 or 22222 would give very little security since a piece of wire could serve as the key. Other uniform cuts are out because they are susceptible to shimming. To keep the system secure, it is best to keep a two-depth interval between any two change keys. For example, 11134 is only one depth away from 11133, so 11134 should be used and 11133 omitted. The rationale is that 11134 is the more complex of the two. The next step is to select a master key combination composed of odd numbers. At the top of your worksheet, mark the combination you have selected for the master key. Below it add a random list of possible change-key numbers. If you choose a systematic approach in developing change-key numbers, you compromise security. On the other hand, the systematic approach ensures a complete list of possible combinations. Begin systematically; then, randomly select the change-keys combinations. A single code could be used for all customers. The main point to remember is to use different keyways.
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Figure 9.6 The master key oper-
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ates on the left side of the tumbler.
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Masterkeying Pin Tumbler Locks Masterkeying is more involved than modifying the cylinder. It requires the addition of another pin sandwiched between a top and bottom pin. This pin, logically enough, is called the master pin. The master system is limited only by the cuts allowed on a key, the number of pins, and the number of pin depths available. Since this book is for beginning and advanced students, the subject will be covered on two levels: the simple master key system for no more than 40 locks in a series and the more complex system involving more than 200 individual locks. It is important to remember that a master key system should be designed in such a way as to prevent accidental cross keying. Pins are selected on the basis of their diameters and lengths. Master-pin lengths are built around the differences between the individual pin lengths. Consider, for a moment, the Yale five-pin cylinder with pin lengths ranging from 0 to 9 cuts. Each pin is 0.115 inch in diameter. Lower pin lengths are as follows:
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0 = 0.184 inch 1 = 0.203 inch 2 = 0.221 inch 3 = 0.240 inch 4 = 0.258 inch 5 = 0.276 inch 6 = 0.296 inch 7 = 0.315 inch 8 = 0.334 inch 9 = 0.393 inch
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As an illustration, let s masterkey 10 locks with five tumblers each. Each tumbler can have any of 10 different individual depths in the chamber. Determine the lengths of each pin in each cylinder. Mark these down on your worksheet. The master key selected for this system may have one or more cuts identical to the change keys. Cut a master key to the required depths. In this instance, load each cylinder plug by hand. Using the known master key depth, subtract the depth of the change key from it. The difference is the length of the master key pin. If the change key is 46794 and the master key is 68495, the master pin combination will be as follows:
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