Recent content by davidbdix
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Undergrad Possible combinations with thirteen buttons
This is similar to one of my previous posts, but is quite different. There are 13 buttons (numbered 1, 2, 3, ...13)in this combination lock, and you have to figure out which ones can be pressed in. They can either be pushed in or left into their original extended position. You don't know...- davidbdix
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- Combinations
- Replies: 3
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad How to calculate possible combinations of sets
great! thank you- davidbdix
- Post #6
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad How to calculate possible combinations of sets
By the way, pressing the wrong buttons reinforces the lock. Each wrong button has a lock bar on it, sliding into the lock, making it stronger than before. :)- davidbdix
- Post #4
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad How to calculate possible combinations of sets
Thank you for the reply. I expected it would be an infinite answer. I've redesigned the lock. Same scenerio as before. 3 primary buttons, 11 secondary buttons. This time, the user is aware that each secondary button can only be pressed once, and order still does not matter. Choose 1...- davidbdix
- Post #3
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad How to calculate possible combinations of sets
Posts: 10 I am a woodworker, and am designing a two part magnetic/spring lock for my blanket chest. The first part has 3 master buttons (primary buttons A, B, C), and the second part has 11 secondary buttons (1, 2, 3, ...11). What you do first is choose 1 of the 3 master buttons that opens...- davidbdix
- Thread
- Combinations Sets
- Replies: 5
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad Two-part problem; calculating possibilities of lock
Thank you very much! That is not enough combination possibilities for me, so I need to raise the stakes a little bit. What if the user pushing the buttons didn't know they only had to push 1 master 3 secondary. In fact they don't know how many buttons had to be pushed in at all? The... -
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Undergrad Two-part problem; calculating possibilities of lock
I am a woodworker, and am designing a two part magnetic/spring lock for my blanket chest. The first part has 3 master buttons (primary buttons A, B, C), and the second part has 11 secondary buttons (1, 2, 3, ...11). What you do first is choose 1 of the 3 master buttons that opens the first part... -
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Undergrad Space saver compartments with mechanical crank device
yes, I've made gears with the bandsaw, but now have all the templates to make a complete wooden clock. the corners will probably be rounded over with the router to make the directional change in the corners easier.- davidbdix
- Post #5
- Forum: Astronomy and Astrophysics
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Undergrad Space saver compartments with mechanical crank device
the purpose is to use as many compartments in one given space, and have them hidden, so only a couple are accessible at one time. the other purpose for the entire project is to use as many mechanical devices i can come up with and build them.- davidbdix
- Post #3
- Forum: Astronomy and Astrophysics
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Undergrad Space saver compartments with mechanical crank device
Greetings. I am a woodworker, and i build lockboxes with hidden compartments and complicated homemade magnetic locks. On my current lockbox, i am trying to design a "box of compartments", 16 compartments to be precise. included is a quick top view (looking down) design. there are actually 15...- davidbdix
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- Crank Device Mechanical Space
- Replies: 5
- Forum: Astronomy and Astrophysics
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Where to find a schematic for a push-button combination cypher lock
i don't care much for the electronic locks. the mechanical ones are the type I'm trying to duplicate. thanks for the idea about the clear paper.- davidbdix
- Post #5
- Forum: Computing and Technology
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Where to find a schematic for a push-button combination cypher lock
of course, i want the design as simple as possible, but just as effective as the push-button type lock. the easier the design, the less pain in the rear building it i am being creative, but there are so many moving parts in one of those locks, it's difficult to keep track of what-is-doing-what...- davidbdix
- Post #3
- Forum: Computing and Technology
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Where to find a schematic for a push-button combination cypher lock
im trying to build a cypher-type push-button non-electrical combination lock. the problem is there are no threads/schematics/drawings/specs/diagrams that actually instruct how the push button mechanics work. is there somewhere i could be looking for a schematic?- davidbdix
- Thread
- Combination Lock Schematic
- Replies: 4
- Forum: Computing and Technology
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Homemade cylinder/actuator push-button pin/tooth/spring mechanic lock
i do have to include that this is just an early stage drawing. it is nothing more than an idea. the 4 'blocks' on the cylinder are nothing more than an example/idea. there would be many many more than 4. and they don't have to be blocks either. they could be triangular holes with teeth that...- davidbdix
- Post #2
- Forum: Mechanical Engineering