Lock Picking and Impressioning in Visual Studio .NET

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Lock Picking and Impressioning
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well. Aluminum blanks are soft enough to mark well, but they break off too easily. Brass blanks work best. Nickel-plated brass blanks are also good for impressioning because the nickel plating can be filed off.
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Filing the blank. New key blanks have a hardened glazed surface that hinders
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impressioning unless you prepare them. To prepare a key blank, shave the length of the blade along the side that comes in contact with the tumblers. Shave the blank at a 45 angle without going too deep into the blank (Fig. 14.12). You want the blank s bitting edge to be sharp (a knife edge) without reducing the width of the blank because some pins may require a No. 0 cut to reach the shear line. File forward only. Don t draw the file back across the blank. Use a round or pippin file with a Swiss pattern No. 2, 3, or 4 cut. A courser file will shave the blank quicker but will leave rougher striations on the blank. This will make the impression marks harder to see. A finer file will make the marks easy to see but will clog quickly while you re filing. This will make impressioning take a long time. You probably won t find impressioning files at a hardware store or home improvement center, but they re sold though locksmith supply houses. Another popular way to prepare the blank is to turn the blank over and shave the other side of the blank along the length where the tumblers touch the blank. After shaving both sides of the bitting edge at 45 , you will have a double knife edge. Other Useful Equipment and Supplies In addition to a file, you ll need a key-holding device, such as an impressioning tool or a 4- or 5-inch pair of locking pliers (Fig. 14.13). A magnifying glass can be helpful for seeing impression marks. A head-wearing type lets you see the marks and file at the same time. Head-wearing magnifying glasses are
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Figure 14.12 Shave the bitting edge of the blank at 45 .
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Fourteen
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shown in Fig. 14.14. Although they aren t essential, you can use depth and space charts and a caliper to file marks more precisely. Popular Impressioning Technique The pull method of impressioning is often used on pin tumbler locks. After preparing the blank, insert it fully in the keyway with locking pliers or an impressioning tool and turn clockwise (Fig. 14.15). This will bind the bottom pins against the chamber walls (Fig. 14.16). Maintain the turning pressure, and rock the blank up and down several times while slightly pulling the blank out, about 1 16 inch. The rocking and pulling will cause the pins to press into the
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Figure 14.13 Use a pair of locking pliers to hold the blank while you re filing it.
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Figure 14.14 Head-mounted magnifying glasses can help you to
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see impression marks.
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Lock Picking and Impressioning
Cylinder
Key blank Locking pliers
Figure 14.15 Using locking pliers or an impressioning tool to turn
the blank in the cylinder.
Top pin
Bottom pin
Key blank
Figure 14.16 When you turn the plug that has a prepared blank, the bottom pins will bind and leave an impression on the blank.
blank, leaving small marks or impressions. Then turn the blank counterclockwise, and rock the blank up and down several times while slightly pulling the blank out. (If the lock turns in only one direction, then twist the blank in that direction only.) Remove the blank from the keyway, and look for impression marks. You may see one mark or several marks. File down about one depth at each mark (Fig. 14.17). You can use depth and space charts and a caliper to precisely file the blank. Don t file where you don t see a mark. The marks will be subtle; they aren t dark imprints like a felt tip pin. They are a change in the texture of the key blank filing. When the light is properly reflected, the markings look like small, smooth spots. You may need to view the blank at different angles to see the marks.
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