Cruciform Lock - BUMPED!

by **illusion** » 3 Jan 2006 17:36

Okay guys, so likely you'll remember a short while back a thread talked about bumping a cruciform lock. I went away and began filing down a bump-key and got to work practising with different tools, but found all the ones I usually use inadequate - it turns out that the best solution was to simply make a tomohawk style hammer.

The handle of the hammer is made of PVC... and the striker is made from a piece of Oak I simply carved into shape... this is fixed to the handle by a cross-head screw.

Once I had made the hammer I had a greater degree of success, yet only when pulling the bump-key out one space before bumping it has it been succesful - the minimal-movement methord sadly didn't work despite removing material from the shoulder and the tip of the key. However it does indeed work every time so I wasn't dissapointed.

The movies are relatively small, ie: 3mb each so no worries about download times.

Annoyingly I'm still having to use my digital camera to film, and whilst I'm greatful, a time-limit of 20 seconds is somewhat constricting.

The bump-key was somewhat hit-and-miss, and eventualy I ended up filing it all the way down... well perhaps give-or-take a bit it was incorrectly cut in regards to the depth, but it does function, and every time, so I'm happy

by **webidiot2** » 4 Jan 2006 2:43

Awesome, I've never came across a crusiform lock but I will definitely make a bump hammer just like yours.

by **workstation** » 4 Jan 2006 5:28

Brilliant work! You've really proved something there. I wonder if the tolerances were too high for the minimal movement method?

by **illusion** » 4 Jan 2006 11:30

I really cant figure out why the minimal movement methord won't work...

I've proved that a piece of PVC and a lump of wood can make a tomahawk lol.

I'm glad you enjoyed it and found use for it... that's the point of posting it on this forum I guess

if you're interested ebay throws them up failrly often and cheaply on steering wheel clamps... although don't bother removing the cylinder out of the clamp - it's not really worth it unless you want to see what it looks like inside.

Thank you for the comments

by **Shrub** » 4 Jan 2006 11:35

Another good 'un mate :wink:

by **Chrispy** » 5 Jan 2006 4:50

When you say you filed it "all the way down", did you just pick the deepest cut and file the rest to follow suit? Or did you file right down the the crossroads and leave the hills?

by **illusion** » 5 Jan 2006 8:14

I filed them down to the crossroad, but I reduced the height of the hills to the same length. I went to the deepest cut and then just filed a bit more away, but the deepest cut itself was basicaly at the crossroads...

one thing i've noticed is that the key looks a bit bent and flimsy in the photos, but it's actualy straight lol.

by **specialist** » 13 Jan 2006 21:27

Illusion, would you say that bumping a cruxiform lock has a greater chance of success than picking? Personally, I'm not sure. I don't see these very often, and can't even get the blanks from my distributor. Good job on both your hammer and bump key.

Specialist

by **illusion** » 13 Jan 2006 21:44

On the lock I tried it on... 2 taps or less and it is open.

They pick fairly easily, but bumping this lock was stupidly easy... If you want to open the lock I was playing with quickly then bump it... I had to just use the one key that came with the lock to make it... but no catastrophes so it was ok.

Thank you - I'm glad you liked the hammer

by **bbishop762** » 27 Feb 2006 22:56

Seems that this is an easily bumped lock, but with a three or four rotation bolt retraction. PREVIOUS POSTS DIVULGFE THAT THERE IS A PIN HANG ON EVERY 1/8th turn. ThatÂ´s alot of bumping. They are very prominant here in Bogota apartment bldgs. Any chance of spinning the plug past the 1/8th turn holes?

by **Chucklz** » 28 Feb 2006 0:52

I dont think that would be easily done, as you couldnt remove the bump key to use a spinner. Some kind of spring may be attached to the key though.

Buena suerte!

by **Dent** » 28 Feb 2006 2:50

If you can get it withing 1-3 taps, just repeatedly striking it while turning should actually go pretty quickly, right?

by **illusion** » 28 Feb 2006 10:04

Well this lock only turned 90 degrees to unlock.

The idea of spinning the lock, by spinning the bumpkey was discussed before, but I don't think anybody tried it.

by **quicklocks** » 28 Feb 2006 12:28

hi nice vid what was the pvc bit before you started work on it ??

by **Kaellman** » 4 Mar 2006 9:43

Nice work on this one. Just bought a crusiform from on my vacation in Thailand. Never tried bumping one. Have to give it a try!

Cruciform Lock - BUMPED!

Cruciform Lock - BUMPED!

Papaiz

Who is online