![]() ![]() Ideally, they also would contain a chronological list of “change orders” that detail precisely what locks and keys were changed and when. Hopefully, the documents would show the date the system was created and the date this version was printed. It suggests that someone has updated the documents. Several ink marks are on the paper, where one item has been crossed out and something else written in its place. The paper itself is wrinkled and has one or two coffee stains on it. Suppose the client produces a bitting list that has a KBA at the top and a keying schedule. The upside of decoding is we might avoid the inconvenience of tracking down all the key holders and issuing them new keys. Often, it takes even more time than what it would take to create a new master-key system and rekey the entire facility. If you don’t have those two documents, your first task is to acquire them or reverse-engineer them by decoding all the locks and the keys.ĭecoding is a tedious and time-consuming task. The bare minimum is the KBA and the bitting list. The most important documents are the key bitting array (KBA), which summarizes which keys are in the system the bitting list, which tells what keys are in use and the keying schedule, which tells which key goes with which door. You wouldn’t expect a surgeon to operate on a patient without first getting their medical history, would you? When you take over the maintenance of a master-key system that was created by someone else, you have to see the documentation before you start to make any changes to the system. With this in mind, here are five common mistakes in master-key systems. Does this mistake create internal key interchange or significantly increase the risk of key interchange? This will help us to evaluate the severity of the mistake and decide how to prioritize it.Where is the mistake? Is the problem real, or does it exist only on paper? Has the system deviated from a good plan, or was the original plan flawed to begin with? This will help us to determine how to address the mistake.Whenever we find mistakes, we ask ourselves two sets of questions: 6 when it isn’t supposed to, then that’s entirely my fault.įor all three of these situations, master keying makes it worse. If I rekey all the locks in a building, and (oops! ) key No. We generally consider that to be an acceptable risk. ![]() If your front door and my front door have Kwikset 400T3 knobs, there’s about 1 chance in 6,000 that our keys are identical. For example, there are only about 6,000 different KW1 keys. Each type of lock has only a certain number of possible keys. Manipulation typically happens when the test key is similar to the correct key or when a lock is badly worn. ![]() Bump keys are an extreme example of this. If the test key is deeper than the correct key, you might get it to turn by wiggling the key. There are basically three ways it can happen.įirst, there’s manipulation. When an unauthorized key operates a lock, we call that key interchange. The difficult part is preventing the lock from operating by using other unauthorized keys. Simply put, master keying is the art of making one lock operate by two different keys. ![]()
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