Learn why people trust wikiHow. Download Article Explore this Article parts. Things You'll Need. Tips and Warnings. Related Articles. Article Summary. Part 1. Start with the combination dial.
The face of a combination lock is a circular, rotatable dial. Numbers are written around the circumference, usually beginning with 0 at the top and increasing as you go around the dial clockwise. Aside from physically breaking into the safe which is very hard to do , correctly inputting a series of numbers into the combination dial is the only way to open a safe.
Know how the spindle works. This is a small, simple cylinder attached to the combination dial. When you rotate the dial, the spindle rotates as well. The spindle and other parts are not visible even with the safe door open.
Know how the drive cam is connected to the spindle. Located on the far end of the spindle opposite the combination dial , this circular object is threaded onto the spindle and rotates with it.
Understand a safe's wheels. Also called tumblers [2] X Research source , these circular objects encircle the spindle but are not attached to them. They must be caught by the drive pin in order to rotate. A combination lock has one wheel for each number in its combination typically 2—6. For instance, a lock with a 3-number combination e. Knowing how many wheels there are is important for cracking the safe, but there are ways to discover this number without knowing the combination see later parts.
Small tabs on the wheel called the wheel fly catch against the drive pin or next wheel and sets them rotating. This term is not important to remember for this guide; just know that the drive cam makes contact with the wheels to set them spinning. Visualize the fence. The fence is a small rod resting gently atop the wheels. The fence is connected to a lever mechanism responsible for keeping the safe shut.
As long as the fence remains in place, the safe is locked. Older texts may refer to this as lock drop , drop-pawl , or dog [4] X Research source an obsolete term for any object that holds or blocks another. Understand how wheel notches come into play. Each wheel has a notch also called a gate at one point along its circumference. When each wheel is rotated so the notch is at the top, the fence falls into those notches. The lever moves, and the door mechanism is unlocked.
You can see why there is one wheel for each combination number. When you dial the first number, the first wheel is rotated to a position with its notch directly below the fence. You then reverse the direction of your rotation to disengage with that wheel and turn the next to its correct position.
The drive cam also has a notch for different reasons. The intended purpose is not important to know for this guide, but remember that this notch will "click" every time it slips past the lever stationary part attached to the fence. Extra information for the curious: once the fence falls and releases the locking mechanism, the drive cam notch catches onto the bolt physically blocking the door and pulls it out of the way.
Continue to the appropriate section based on your available knowledge. If you already know how many numbers the combination consists of, skip directly to section entitled "Testing the Numbers.
Part 2. Turn the dial several full revolutions clockwise. This will reset the lock and ensure that all wheels are disengaged. Place a stethoscope near the dial surface. Believe it or not, this Hollywood trope is actually used by professional locksmiths.
Placing the stethoscope in both ears and the bell end against the safe wall amplifies the sounds you're listening for. The mechanism you're listening to is located directly behind the dial, but obviously you cannot cover up the dial since you'll need to turn it.
Try moving the stethoscope between different spots adjacent to the dial as you spin the combination until you find the most audible location. Metal safes reverberate the sounds and make them easier to hear. These are a good choice for a beginning hobbyist. Rotate the dial counterclockwise and listen carefully for two clicks near each other.
Rotate slowly and be ready to note the dial positions. One click will be fainter than the other, since the notch making the sound is sloped toward one side. You're listening for the sound the drive cam notch makes when it slides under the lever arm [6] X Research source see Learn How a Combination Lock Functions. Each side of the notch "clicks" as the lever passes by. The drive cam's contact area is the name of the area on the dial face between these two clicks.
Reset the lock again and repeat. Turn the dial several revolutions clockwise, then listen again as you turn slowly counterclockwise. Clicks can be faint or obscured by other sounds. Repeat the process two or three times and confirming the pattern of two nearby clicks in a consistent small region of the dial face. Dial counterclockwise until the dial is opposite the sound of the two clicks. You've placed the wheels in this location and can now count them as you "pick them up" by turning the dial.
Turn the dial clockwise and listen each time you pass the original point. Turn slowly and pay close attention each time you pass the point you "parked the wheels". The first time you pass that position, you should hear a click as a wheel is engaged and begins to spin with the drive cam. Each subsequent time, you will hear a click only if there's an additional wheel to be "picked up". Keep rotating and count the number of clicks you hear. Only count clicks audible in that "parked" region.
If you hear many clicks or clicks in the wrong position, you may have made a mistake while "parking". Try again from the beginning of this section and make sure you are resetting the dial completely by giving it an extra few rotations. If you are still encountering the same problem, the safe you're using could have anti-cracking technology. You may need to call a professional locksmith. Write down the total number of clicks.
Once you rotate past that point and hear no additional clicks, note the number of total clicks. This is the number of wheels in the combination lock. Each wheel corresponds with one number in the combination, so you now know how many numbers you need to enter. Part 3. Set up two line graphs. You'll need to record a lot of information in order to crack a safe. Not only are line graphs an easy way to do so, the shape of the graph will aid you in finding the data you'll need.
Label each graph. Each graph's x-axis should cover a span from 0 to the highest number on the dial face, spaced out enough to clearly graph points 3 numbers apart or closer. The y-axis only needs to cover a span of about 5 numbers, but you can leave it blank for now. Label one graph's x-axis "starting position" and its y-axis "left contact point". Label the second graph's x-axis "starting position" and its y-axis "right contact point". Reset the lock, then set it to zero.
Spin the dial several rotations clockwise to disengage the wheels, then set it at the zero position. Rotate slowly counterclockwise and listen.
You're trying to find the contact areas where the drive cam connects to a wheel see Learn How a Combination Lock Functions. When you hear two clicks close together, note the position of the dial at each click. Make sure to note the exact number you heard each click. You'll need two separate points, usually within a few numbers of each other. Graph these points. The y-value is the number on the dial where you heard the first click.
You can now label your y-axes. Leave enough room to graph a spread of 5 numbers on either side of the y-value you just recorded. Reset the lock and set it 3 numbers left of zero. Spin the dial clockwise a few times and set it 3 numbers further clockwise of zero. This new number is the next x-value you'll record. Continue recording the location of the two clicks. Find the new y-values of the first and second clicks when you start at this location.
They should be near where you heard them last time. When you've recorded the second location, reset the lock again and set it an additional 3 numbers counterclockwise. Keep testing until your line graphs are done. Once you've mapped the entire dial in increments of 3 and are back at the zero position, you can stop testing. Look for points on your graphs where the two y-values converge. At certain x-axis points the difference between the left and right contact point values y axis will be smaller.
Each of these points corresponds with a correct number in the combination. You should know how many numbers there are in the combination, either because you've used this safe previously or because you followed the instructions for Find the Combination Length.
If the quantity of converging points on the graph doesn't match the quantity of numbers in the combination, make a new graph and see which points are consistently narrow. Write down the x-values at these locations. If you successfully followed these steps, these numbers should be the ones used in the combination, or at least close enough to work. Note that we do not know which sequence of these numbers is the correct one.
Read on for additional testing and tips. Part 4. Try every possible sequence of the numbers you located. Reply 2 years ago. I've successfully found the combination for this lock I have reset twice, though this third time isn't working. My fingers are raw. It feels like it has a lot of false sets? I'm new to this, so I'm not sure if that's true or not. Brand is Disecu. If you just bought it the default code is and if it is unlocked turn it to a degree angle and hold the ring down, then set it and after that pull it up and lock to see if the combination work Hope this help you!
If you need help just find me. Question 7 months ago. Question 2 years ago. Answer 9 months ago. The top of the lock is what we like to call the reset. These lock's are made to be reset if you please. The way that you use it is to click the button, set the combination that you want and then reset it. It should work then. Answer 2 years ago. This may be a reset change combo button. More by the author:. Did you make this project? Share it with us!
I Made It! Reply Upvote. Nad micksonbobby Reply 5 months ago. Ohhjoe micksonbobby Reply 1 year ago. I found an abandon lock a few days ago and I tried it and it really worked. I was shocked. Toxictom 4 years ago. CherR4 3 years ago on Step 5. JohnS CherR4 Reply 2 years ago. I need help figuring out how to crack this lock can you help me. Answer Upvote. What is the button on the top for? It says Hampton on the side RoBear julie.
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