Haunted Spider 8 years ago on Introduction. The first cabinet had kiychen well an identical system to this one in terms of the lock rods and the lock rod plates - but it didn't take long for son number one to figure out how to beat the system. By applying a light tugging pressure on the drawer handle as you slowly twist each lock rod, you combination lock for kitchen cabinet level eventually "feel" as each of the rod flats line up with the lock rod plate openings. Create login. For security, cabihet the combination in seconds. These locks also come with two keys.

The envelopes were sealed and placed at random in the top three drawers. So on the anniversary when the combination is revealed the contents Combination Lock For Kitchen Cabinet Zoom envelopes or other gifts can be accessed. Of course this may not work as intended, as the level of bribery re getting the combination early could come into play. The video below shows how the combination locking system works and the Steps following the video give details on the construction of the cabinet and the locking system.

Mortise and tenon joints, pocket holes, and dovetails are the primary joinery methods used in the construction of the cabinet and drawers. Each drawer has a "lock rod plate" that mounts with two screws to the drawer.

The drill press and the table saw with a sled make this operation easy. I used scrap wood spacers to keep the spacing between openings consistent. Mark the dowels where you need the flats machined after the lock rod plates are made and mounted on the drawers.

An mdf block with a setscrew secures the rod for the first flat as the block runs in the router table groove. Flipping the block over and routing the second flat ensures a perfectly parallel set of flats. A little bit of sanding at the cuts completes the procedure.

Seven lock rods were needed for this cabinet. The angular position of the flats for any given lock rod were selected arbitrarily - I just mixed it up a little by eye.

Light springs and brass pins keep the rods in place and makes for smooth turning. The combination of the lock rods and the lock rod plates Combination Lock For Kitchen Cabinet Driver on the drawers should, in theory, complete the locking system and present so many combinations that guessing the correct one or two would be pretty well impossible. However, I should mention that this is Generation 2 of this wooden combination locking system.

The first cabinet had pretty well an identical system to this one in terms of the lock rods and the lock rod plates - but it didn't take long for son number one to figure out how to beat the system. By applying a light tugging pressure on the drawer handle as you slowly twist each lock rod, you can eventually "feel" as each of the rod flats line up with the lock rod plate openings.

To overcome this deficiency in the current version of the cabinet, a hinged "lock rod cover" with a linkage to a pins that fit in a right angle groove on both sides of each drawer securely locks the drawer in place when the lock rod cover is open. With this setup you can't twist the rods and tug on the drawer to beat the system because when you can see the rods to twist them cover Open the drawers are locked in place by the pins.

I put together a couple of mock-ups as part of the design process to get the lock rod cover and the linkage working smoothly before i did the final construction. One mock-up is shown here. I went with plastic flat bars to give a friction free sliding action and to insure dimensional stability in the system over time. The brass pins that are press fitted into the plastic flat bars are kitchen cabinet shelf pins.

The points of the compass are the heads of brass brads. The final step to make the locking system work even more effectively is the lock rod shield plate that is shown being inserted in the drawer cavity. This shield helps prevent visual observation of the lock rod positions when one or more drawers are removed. I'm hoping that some Instructable viewer can figure out how many lock rod combinations are possible, besides the correct one or two , for any given drawer.

I don't know. There are possible combinations for each drawer based on a little simple binary math. Because each rod has a position where it is correct 1 , and its opposite 0 , each rod's unlocked position can be said to represent a binary bit.

The total number of working combinations can be worked out by determining what the largest number is that could be represented by the number of binary bits corresponding to the number of dowels.

The range here is to , with the possibilities in between being variants such as or , and so-on, with each rod being aligned either as intended or in the reversed position.

If we include 0 , which represents all of the dowels aligned as intended, that brings the total up to possible arrangements per drawer. It's not terrible security, actually, considering that an apartment door that has been set up to work on a master key system might accept as many as 35 other keys.

If we assume a fair level of precision and no angling of the cuts that might help to align dowels that are close but not on the money, we get 16 possible positions for each of the seven dials, of which eight are duplicates of their opposite position. In a six drawer system, that means that as long as no two drawers share the exact same dowel position to open, there are x 6 combinations that will open at least one drawer, half of which can be thrown out by an attacker, leaving 64 x 6, or Remember that will open a drawer just as easily as , so why try both?

Assuming this, that means that there are still 2,, combinations that will not open any drawer. If I've carried all my ones and put my decimal points in the right places, that makes the odds of putting in a code at random that opens one of the six drawers , or roughly 1 in 5, If the machining is extremely tight, you could increase the number of possible positions to 32 or even 64, though you might need to use steel or brass rods to achieve this level of precision, and at 64 positions per dial you would increase the number of possible positions to 4,,,,, or roughly 4.

Friction locking the rods when the cover is in place would effectively prevent an attacker approximating the correct position and coaxing it in to place with brute force. Anyone who does mathematics or cryptography for a living is invited to double-check my work, but I think I got it right. A motivated attacker could feel their way from right to left, or left to right, or outside to middle by turning the knobs a half step at a time in pairs until they got some movement, significantly reducing the number of guesses required to get in.

This attack could be thwarted by putting each drawer on a guide track with gliders or bearing slides to reduce lateral movement, but might be overkill depending on the actual level of security desired. One could simply smash the chest or drill out the dowels, but that's not really the point, is it?

I hope I answered your question, and I think I got my numbers right. Again, if you're reading this and you're a cryptographer or professional mathematician, feel free to correct anything I've gotten wrong!

Reply 7 years ago on Introduction. Hi churusaa - Wow, thanks for the work on figuring this out! As you can see from others there is disagreement in the final calculated outcome and approach to solving the problem. Not being into this kind of determination not a clue I appreciate all input that results in some answer as to how many possible combinations are involved to open one of the drawers.

If you have access to others with like abilities perhaps you might pass the page link on to them to see if your particular calculations can be verified. If you do get a chance to do this please let me know. Thanks again. For security, change the combination in seconds. The back of each lock has a push-button combination changer that allows switching between five three-number combinations.

A control key sold separately overrides the combination. All of these locks are factory registered with an exclusive keying system that is unique to your locks. They have concealed mounting bolts to prevent tampering. To determine door swing direction, stand facing the locker. If the hinges are on the right, select a right lock; if they're on the left, select a left lock. Note: When ordering a Combination Lock For Kitchen Cabinet Zero new system, order a control key sold separately. When matching an existing group of locks, please specify key number.

These locks automatically lock when the locker door is closed. With these locks, users can select any locker that's not being used, create their own combination, and secure their items. Once they open the lock, it automatically resets for the next user.

These three-number locks allow up to 1, different combinations. A control key overrides the combinations. Contact Us Order. Log in. Create login. Choose a Category. Clear All. Opens With. Cam Latch Type. Combination Style. For Maximum Thickness. Latching Distance. For Through Hole Diameter. For Use On. Combination Type. Mounting Style. Combination Resettable. Turn Direction. Number of Possible Combinations. Offset Cam Length. Straight Cam Length.

Offset Cam Width. Straight Cam Width. Cam Style. Head Diameter. Locker Lock Type. Locking Bar Type. View catalog pages 3. Send Cancel. How can we improve? About Cam Latches and Locks. Resettable Combination Cam Locks. Straight Cam. Shared-Use Combination Cam Locks. Swing-Handle Combination Cam Locks.

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