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# Insight - How Number Combination Lock works

Number combination lock is like a mystery game of combinations and sequences. With the use of mathematical logics and basic laws of physics (balancing of forces) the old traditional padlocks have been replaced by new and modified number combination lock. Padlocks are the portable locks that were designed to defend against any theft, vandalism or sabotage but with passage of time they became part of day to day life as a safety measure.  Padlocks used earlier were heavy and required key to unlock but with number combination lock it becomes easy to handle the system as only thing that is required is a code which can activate or deactivate the lock. Now, all one has to do is set their code and activate the lock. Lets take the insight of number combination lock in the following section stepwise from its outer parts to the innermost components.

Number combination lock can be viewed in two ways:
Outer body (casing)
Inner body (casing)

Outer casing:
The outer structure looks just similar to the traditional lock. The parts that can be identified on the external body are two metallic hooks on both sides of lock, shack, and three disks in this case with numbers engraved on it and an engraved line on the body of the number lock below the disk. This engraved line helps in correctly aligning the number while opening the lock. Metals used for outer casing can be copper or zinc. Different alloys can also be used but alloys such as brass, chrome, stainless steel is more preferable as they are more immune to rusting. The locks are often painted or electroplated so as to prevent rusting or oxidation. There is a cap present at the bottom of the casing. This cap is used to change the code for lock.

The position of the cap is shown in the image below.

cool!

nyc!!!

super

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