이름 : Dale French
이메일 : dalefrench@hotmail.com
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예식일 : What Is Billiards: High quality vs Quantity
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The plug/shell border is called the shear line. The height (or cut depth) of a key under each pin stack position is called its bitting; the bitting of a key is the "secret" needed to open a lock. Although combination lock manipulation exploits some of the same kinds of imperfections as pin tumbler lock picking, the principles and techniques are quite different and are well beyond the scope of this document. In particular note that because the pins are slightly out of alignment, as the plug is turned gently, only the pin stack that is most out of alignment actually prevents further rotation. Note the border between the plug and shell, which forms the shear line, and the cuts in each pin stack resting within the plug. Left: Cylinder face, the lock's "user interface." Note the keyway, which is cut into the plug, which in turn sits inside the shell. Each pin stack is cut in one or more places perpendicular to its length. See Figure 2. The plug will be blocked from rotating if any pin stack is lifted either not far enough (with the cut still in the plug below the shear line) or too far (with the cut pushed above the shear line and into the shell); to rotate, all pin stacks must have a cut at the shear line.

You may hear a faint "click." This is because you've pushed the cut (between the bottom and the top pin) up to exactly the shear line. In practice, of course, locks aren't perfect: the pin holes in the plug are slightly out of alignment with respect to the shell and the pins and pin holes are each of a slightly different diameter. In an ideal lock, all of the pin holes in the plug would be in perfect alignment with the corresponding holes in the shell, the centerline of the plug would be exactly parallel to that of the shell, and all of the pins would be exactly the same diameter. The top pin of that pin stack will be trapped above the shear line, the bottom pin will fall freely, and now a new pin stack (the next most misaligned one) prevents further rotation. So just click on the pics above to go to the Rugs page, where you may download unattractive base-object rugs with multiple tiles. It's hard to learn these skills all at once on off-the-shelf commercial locks, but that's what many people who try to learn lock picking end up doing (before giving up in frustration).

In the lab there is a collection of "training locks," mounted on boards, for practice. That's it -- now you know almost everything there is to know about lock picking. Pin tumbler lock picking consists of raising the cuts on each pin stack to the shear line, one by one, until the plug turns freely. Picks probe and lift the individual pin tumblers through the keyway, while torque tools control the degree and force of plug rotation. For most of the picking methods discussed here, in which tumblers are manipulated one by one, a "hook"-style pick is generally used. Unfortunately, these designs are less than ideal, and many of the "standard" picks are too large to fit and move comfortably in common lock keyways. A key that is bitted to the wrong depth in even one pin position will not operate the lock. Figure 2. Pin tumbler lock with a correct key inserted. Good tools are important, to be sure, but once a few basic tools are available the student of lock picking is usually better off investing in new locks on which to practice rather than in new picking tools. Picking tools are designed to perform one of two basic functions: manipulating pins and turning the plug.

Two tools -- one for each function -- are used simultaneously when picking a lock. If you tried to rotate the plug of such a lock without a key in the keyway, the top pin segment of each pin stack would block the plug at exactly the same number of degrees of rotation; each pin stack would contribute equally to preventing the plug from turning. You should be able to confidently find each pin and push it all the way up, without jamming the pick against anything or moving other pins. Repeat until lock turns: - Locate the pin stack that's being pinched at the shear line (it resists slightly when pushed up) - Continue to push that pin stack up until its cut reaches the shear line and the plug turns slightly. Success in lock picking is mostly a matter of skill. The basic algorithm for picking locks is remarkably simple: - Apply a small amount of torque to the plug. The proper pick and torque tool selection depend on the shape of the keyway, the features of the lock, the picking technique, and the individual preferences of the user.

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