Disc locks in .NET

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Disc locks
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The view down the keyway of a disc tumbler lock shows a row of discs with their centers cut away and staggered. The cutaways are at different heights; the discs themselves are the same diameter. The cutaway looks like a small staircase with a surrounding wall (formed by the vertical edges) around the steps. Since each disc is the same size, only the height of the steps varies, and this
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Disc Tumbler Locks
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27/32" 21.43 mm 19/32" 15.08 mm
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Parts
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Desk lock
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1. Nut 2. Bolt 3. Shell 4. Retainer clip 5. Spring 6. Plug 7. Springs 8. Disc tumblers 9. Key
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13/16" 20.54 mm 11/32" 8.73 mm
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Figure 6.4 Exploded views of a disc tumbler cam lock for desks. (Dominion Lock Co.)
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Six
Parts
Cam locks
1. Nut 2. Lock washer 3. Cam 4. Stop cam 5. Nut 6. Shell 7. Plug 8. Springs 9. Tumblers 10. Key
Figure 6.5 Exploded view of cam lock. (Dominion Lock Co.)
variation is predetermined. A No. 1 disc has its cutaway toward the top of the tumbler; a No. 5 has its cutaway situated low on the tumbler (Fig. 6.14). The skill of reading a disc lock is learned here. Study the discs through the keyway. Notice the relationship of the discs to each other and to the keyhole. Through constant study and practice, which includes mixing the various discs, you will be able to determine which disc is which (Fig. 6.15). Lift each disc and compare it to the disc in front of or behind it. To do this, you will need a reading tool. This is nothing more than a stiff length of wire about 3 inches long, mounted in a small dowel handle. Think of the tool as a long hairpin attached to a short piece of wood for convenience in holding. The wire should be bent slightly so you can see the tumblers. Insert the tool into the lock, holding it so you can see the interior and observe the discs. By shifting the tool to raise and lower each disc, you can see the relationship of each disc cutaway to the next disc and to the keyway. Using your knowledge about the cutaway relationships, you will be able to decode the tumblers and cut a key for the lock. You might ask yourself, How do I know where to cut the key and how deep Recall that when impressioning a key, you blackened the key and determined the cutting point by the pressure of the levers on the key as you tried to turn it. The same technique applies here. Insert a blackened key and give it a slight turn. This brings the key in contact with the sides of each tumbler cutout. The cutout leaves a mark on the blank, indicating the portion of each cut.
Disc Tumbler Locks
Parts
Drawer lock
1. Mounting screw 2. Bolt 3. Shell 4. Retainer clip 5. Spring 6. Plug 7. Springs 8. Disc tumblers 9. Key
1/8"
3.18 mm
15/32" 29.37 mm 7/8" 22.23 mm
21/16" 52.39 mm 17/16" 36.51 mm 5/8" 15.88 mm
11/32" 8.73 m
Dia 7/8" 22.23 mm
17/16" 36.51 mm
Figure 6.6 Drawer lock, exploded view. (Dominion Lock Co.)
Six
Parts
Drawer lock with removable backplate
1. Mounting screws 2. Removable backplate 3. Bolt 4. Shell 5. Retainer clip 6. Spring 7. Plug 8. Springs 9. Disc tumblers 10. Key
Figure 6.7 Drawer lock, exploded view. (Dominion Lock Co.)
Parts
Sliding door lock
1. Mounting screw 2. Case 3. Screw 4. Spring 5. Shell 6. Spring 7. Retainer clip 8. Spring 9. Cam 10. Plug 11. Springs 12. Disc tumblers 13. Key
Figure 6.8 Sliding door lock, exploded view. (Dominion Lock Co.)
Disc Tumbler Locks
Parts
Sentry series cam lock
1. Screw 2. Lock washer 3. Cam 4. Stop cam 5. Nut 6. Shell 7. Disc tumblers 8. Springs 9. Plug 10. Key
Figure 6.9 Sentry series cam lock, exploded view. (Dominion Lock Co.)
Parts
Cam locks
1. Nut 2. Lock washer 3. Cam 4. Stop cam 5. Cylinder 6. Springs 7. Top pins 8. Bottom pins 9. Spindle assembly 10. Nut 11. Shell pin 12. Shell 13. Key
Figure 6.10 Tubular key cam lock, exploded view. (Dominion Lock Co.)
Six
Parts
Removable core lock
1. Cam 2. Sleeve 3. Stop cam 4. Cylinder 5. Springs 6. Top pins 7. Bottom pins 8. Spindle assembly 9. Shell pin 10. Shell 11. Key
Figure 6.11 Removable core lock, exploded view. (Dominion Lock Co.)
Determining the depth of the cuts requires experience. You have already learned that cutting a key is slow, patient work. As you get closer to the proper depth, move the file with less pressure than before. The same care and precision is needed here. A disc with a No. 1 cut hole requires a deep key cut as compared to a No. 4 or 5 disc, which require a very shallow cut. For reference aids, use various extra keys that you have collected. Since the depths of the cuts are standard in the industry, you can look at a key with a 13354 cut and, by observing the differences in the depths of each cut, know exactly how deep a No. 2 cut should be. Obtain a depth key set from a locksmith supply house. This set has a different key for each depth, with the same cut in all five tumbler positions. Thus, a No. 2 key has five No. 2 cuts; a No. 3 key has five No. 3 cuts; and so on through the series. With the help of these keys and your trained eyesight, you can place a blank in a vise and cut the key by hand. Without a depth key set, you can use a variety of disc keys as guides. Select a key with the proper cut and align your blank to it. You can also make your own set of depth keys. Making the set teaches you how deep to make each cut at any given position on the blank.
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