Filling down Bump Keys

[fgarci03]

Hey!

Since I've never made bump keys before, I'd like to have a few advice before starting:

1. What kind of file should I use? What is the best shape? Triangular? The valleys should look like \_/ instead of \/ right?
2. I never really understand if I just need to file ONLY the "teeth" of the key, or if I should file anything else, as I've read somewhere that I could do something to avoid the use of dampeners, by changing the key in some way.
3. What about Dimple keys? I need to drill right? Just a normal one with a tiny drill? or I need specialized material?

That ought to put me in place to start!
Thank you

Be safe!

[vinnie]

I'm looking to make some myself too, so I'd also like to know some of these answers.

I'll add another: when the peaks on the key are aligned under the pins, does it matter if an of the pins pass the shear line? or if they do does that mean the peaks are too high?

[fgarci03]

Vinnie, I'm not sure if I'm right, and some of the "old guys" here can correct me if I'm not, but I suppose they can't be high enough so that the pins pass the shear line because when you bump it's just a split second when the top pins are above the shear line, and the driver pins are under it. It matches exactly the time when the peaks strike the pins so the plug won't turn because (at least) one of the pins will be blocking it.

Just a thought, as I'm not sure about this!

Be safe!

[brinard]

Use any file that works. I used the square rasp file that was available. lowes etc also has small cheap multi file sets.

compare your key as you make it to a picture off google of "kw1 bump key" or whatever key profile.

on my bump keys, the first try failed... hope you have a few keys to work with.

[fgarci03]

split second when the top pins are above the shear line, and the driver pins are under it

Should have been KEY pins!

[GWiens2001]

That would likely have to do with lock orientation as to whether key pins or driver pins are on top.

For those more familiar with bumping than me, is bumping more difficult on euro profile locks due to gravity?

Gordon

[MrWizard]

Bump keys should be made on an accurate code machine. The spacing and depths of cuts should be made specific to each manufactures specs. If you are trying to bump a lock with cuts that are already above the shear line you are wasting your time it can't work. That is like trying to push open a door with the deadbolt locked. Keys have to be as deep as the deepest cut for the brand lock you working on. The angles of the cuts and peaks between cuts need to be made buy a machine cutter so they are all the same to insure even reaction in all pin cells. Although you can hand file the cuts and get it to work. Just as you can use a pair of vise grips on a nut and bolt where a wrench should be used.

Richard

[MrWizard]

For those more familiar with bumping than me, is bumping more difficult on euro profile locks due to gravity?

Gordon

Gordon

In a lock that is working properly and springs are all in good condition it shouldn't be any harder using a bump key on an upside down lock. It is inertia that is causing the top and bottom pins to separate. The spring pressure and the top pin when hit by the bottom pin makes both pins bounce off each other like taking two billiard balls and slamming them together they bounce off each other and each go back the way them came. But the top pin with the spring returns again towards the bottom pin. The bottom pin when bumping never goes above the shear line. All pins at the same time have to separate repelling away from the shear line for the plug to be turned at that split second.

Bumping a lock and have it to be successful is when the lock is in perfect working order and all pins are moving freely and has no collapsed springs. Best to use contact cleaner that has no oil residue when dry on a lock to get all pins working right then maybe lubricate it with some fine HPC graphite working it in with a key in and out before you start. The smoother the lock works the better chance you will get it open. Now when picking or impressioning a lock I would use contact cleaner but never then put in any lubricant.

Richard

[IndigoChild]

I like the pipping file. its what I use to impression keyways so I am quite comfortable with it. You are able to make the correct angles and create corners because of its tear drop shape. When you have the time and the patience do it right. so many people just hack down into their keys with a triangle file and they are very damaging to locks.