Bump Key Question

[Semi_Dead]

lol... crazy how easy it is to communicate with people interested in the same stuff as you, living half way around the world, that you don't even know. I'll have to come up w/ some other workaround...


p.s. Sorry bout the phsyics.. my head hurts too

[melvin2001]

im pretty sure having an extra pin on the top would at least HELP protect against bumping as long as 2 conditions were true.

1) the mass of the top pin is greater then or equal to the mass of the center pin. (actually i believe it may have to be greater then or equal to mass of center pin+(mass of bottom pin-mass of center pin) someone let me know what you think)

2) the top of the center pin is above the sheer line, so the top pin never interacts with the sheer line.

the only time i can see this NOT working is if the amount the pins are raised when the ridge of the bump key is pressing on them is higher then the sheer line, which would in effect be like raking the pins, when the mass of the top pin is greater then that of the lower pins (as described above) the two lower pins should lift up and fall down together. the top most pin may bounce up but because it is always above the sheer line this should not cause a problem.

[lockpickroy]

i have a couple russwin locks that have a tiny ball bearing at the bottom of the first pin

[Shrub]

i have a couple russwin locks that have a tiny ball bearing at the bottom of the first pin

Thats to prevent wear and drilling,

[d_goldsmith]

If you think of it in terms of the swinging balls thing, the first ball would actually be the bump key, and the amount of force you use would decide how many of the pins rise. To much force would send them all up.

As far as the counterbore, I don't know anything about it, but you said that the pins don't touch. Couldn't you make a bump key that's cuts weren't all the way deep, so that it pushed the key pins up enough to touch the driver pins, and then bump it. Maybe I need to know more about the design.

[Shrub]

Well unless i misunderstood the article on it i read,

It maybe possable to do just that but you would need to know where the counter bores are, if its a 6 pin lock and the bores are random and not in all of the positions you could be stuck,

I think it could be a possable 36 bump keys you would need to try,

[mcm757207]

Another thing to consider is that if you did this you would have a hell of a time getting the correct key to even fit into the lock, because there would be so little room above the pins to allow them to move out of the way for the key to go in.

[Millow]

Hello guys, using the search button I've noticed that you guys were talking about what I was wondering.

Newton's law tells me that if there is more than 2 pins in each cylinder as it is the case in a master keyed lock, then it's unbumpable. And pins don'T need to have different weight although this would help by modifying the speed at which each pins travel through the cylinder, thus, not creating a gap between all of them.

Anyway, anyone have any thought about bumping master keyed locks ?