|
|
Thread Tools | Display Modes |
#41
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On 12/5/2017 1:00 PM, Jeff Liebermann wrote:
On Tue, 5 Dec 2017 10:15:54 -0800 (PST), Frank Krygowski wrote: I've wondered about a sort of multi-layer lock. Start with a strong cable, say about 3/8" diameter. Have it threaded through a hardened steel tube with thick walls. Have that tube encased in steel rings - say, cylinders whose OD is just a bit larger than the ID of the tube. My hope would be that the rings would spin so a grinder would be inhibited. The tube would crush under bolt cutters and protect the cable. I haven't given any thought to bending around corners or a lock mechanism. Sigh. All you're doing is applying familiar metallurgical solutions to the design. The problem is that they are all limited by the limitations of the materials. The closest approximation to cut proof are the various titanium locks: https://www.tigrlock.com https://altorlocks.com It's possible to grind titanium (about the same as stainless steel). The main limitation of a metallurgical solution is that anything that can be fabricated can also be cut. Even the highest temperature alloys can be cut by an even higher temperature torch, such as a mythical portable plasma cutter. If overheating is impractical, freezing with liquid nitrogen can make it brittle enough to break. Like an arms race, the results are predictable and the effort usually futile. The best you can do with metallurgy is to make the lock too expensive to cut. Perhaps a different approach might work better. The problem faced by the average criminal is to steal the bicycle without destroying it. That's easy when the lock is an independently removable accessory. However, suppose the lock were designed and built as an integral part of the bicycle frame. Cutting the lock would destroy the value of the bicycle making the theft much less profitable. Once locks become effective enough, we'll see an increase in bicycle robbery/assault (as with cars) which will make mere theft look good by comparison. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
Ads |
#42
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On Tue, 05 Dec 2017 13:02:31 -0600, AMuzi wrote:
On 12/5/2017 12:03 PM, Jeff Liebermann wrote: On Tue, 05 Dec 2017 07:42:15 +0700, John B. wrote: Given that many of the commercial "bicycle locks" can be rather easily cut with hand tools I have always considered bicycle locking devices as something the prevent a casual thief from stealing the bicycle and am not prepared to spend a lot of money on one. I currently have a 5 foot length of steel chain and a padlock that I carry along if I plan on leaving the bicycle unattended. I believe that the price for my length of chain and padlock is probably cheaper then the specially designed bicycle lock. If that's true, then it's futile wasting money on bicycle locks. Instead, one should invest in a bicycle theft deterrent device: http://vengecycle.com Statutes in most(all? IDK) states make a man trap (slang= 'booby trap') a felony and if you kill the SOB it's a murder charge: https://www.expertlaw.com/forums/sho...d.php?t=119566 http://articles.baltimoresun.com/199...y-trap-burglar https://www.upi.com/Top_News/2008/04...43771372948641 https://www.usconcealedcarry.com/boobytrap-law/ All that's covered in the FAQ. I suppose a few warning labels would help. "Stealing this bicycle might result in uncontrolled flight" or something similar. Once the press is full of horror stories highlighting mutilated bicycle thieves, it would only be necessary to equip the bicycle with the warning label. The deterrent is as effective as the real thing. "Perception is everything". Drivel: Long ago, in high skool, I lost my bicycle lock somewhere. So, I just took the air out of my tires, and pumped the tires back up when I was ready to ride home. None of the local bicycle thieves were interested in stealing an unrideable bicycle, or spending the effort to pump up the tired. That worked for several months and the bicycle was never stolen. However, when I was given a bigger and better bicycle, I decided that it was best not to continue relying on luck and get a proper bicycle lock. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#43
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On Tue, 05 Dec 2017 13:10:11 -0600, AMuzi wrote:
Once locks become effective enough, we'll see an increase in bicycle robbery/assault (as with cars) which will make mere theft look good by comparison. Yep, that's a very real risk. Still, it will buy some time to put some more technology into anti-theft and rider protection systems. for example, a bicycle adaptation of this solution might help: https://www.youtube.com/watch?v=kJGajj_zfZM Just replace your water bottle with a small propane cylinder and torch. Ummmm... no: https://www.youtube.com/watch?v=dcIkO4igOdM -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#44
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
Frank Krygowski wrote:
Many years ago, one bike-shop owning friend told me about the day he lost the key to his cable lock. He had to sit at the exit to the library and cut through the strands of the lock bit by bit. He described the many people who walked by and clearly saw him at work, but nobody stopped him or asked what he was doing. It took a long time but he was able to cut the cable and ride away. When I was a kid I lost my keys to my bike and smashed the lock open with a hammer in the middle of the night. It took a fair amount of hits which echoed between the houses. The police came and I said the bike is mine. The cop laughed, believingly, and said the bike seemed to be "of the same class". It wasn't a very expensive bike. -- underground experts united http://user.it.uu.se/~embe8573 |
#45
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
Jeff Liebermann wrote:
All that's covered in the FAQ. .... what FAQ is that? -- underground experts united http://user.it.uu.se/~embe8573 |
#46
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
sms wrote:
The discerning bicycle thief owns a Bosch GWS 10.8-76 V-EC Professional Cordless 3" Angle Grinder. Not sold in the U.S. but readily purchased on eBay. OK, I'll get one next month first thing Bosch tools are very common here tho I don't know if I've seen that one in particular. I'm currently on Ryobi but if I had more money I would switch to the most expensive Bosch and Kamasa tools [1]. [1] https://www.kamasatools.com/ -- underground experts united http://user.it.uu.se/~embe8573 |
#47
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On Tue, 05 Dec 2017 20:31:36 +0100, Emanuel Berg
wrote: Jeff Liebermann wrote: All that's covered in the FAQ. ... what FAQ is that? http://vengecycle.com The FAQ lives near the bottom of the excessively long scrolling web page with the excessively large type size and the zero contrast gray text on pastel colored background. Is VengeCycle legal? VengeCycle is not legal in every state. If you are planning on purchasing VengeCycle, make sure to check that unlicensed use of explosives is legal in your state beforehand. Is VengeCycle lethal? No. We have worked very hard to ensure the safety of everyone involved in the use and activation of VengeCycle, including bicycle thieves. Damage is generally limited to the hands and is not considered lethal. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#48
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On Tue, 05 Dec 2017 20:38:51 +0100, Emanuel Berg
wrote: I'm currently on Ryobi but if I had more money I would switch to the most expensive Bosch and Kamasa tools [1]. [1] https://www.kamasatools.com/ You might want to read a little about which conglomerate own which tool companies: http://toolguyd.com/tool-brands-corporate-affiliations/ Pick your conglomeratated tool vendor wisely. This week, I'm partial to Metabo which incidentally makes cordless die grinders suitable for cutting bicycle locks: https://www.metabo.com/us/enus/tools/cordless-tools/cordless-die-grinder/ https://www.metabo.com Last week it was DeWalt. Before that, old Mikita. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#49
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On Tuesday, December 5, 2017 at 2:01:04 PM UTC-5, Jeff Liebermann wrote:
On Tue, 5 Dec 2017 10:15:54 -0800 (PST), Frank Krygowski wrote: I've wondered about a sort of multi-layer lock. Start with a strong cable, say about 3/8" diameter. Have it threaded through a hardened steel tube with thick walls. Have that tube encased in steel rings - say, cylinders whose OD is just a bit larger than the ID of the tube. My hope would be that the rings would spin so a grinder would be inhibited. The tube would crush under bolt cutters and protect the cable. I haven't given any thought to bending around corners or a lock mechanism. Sigh. All you're doing is applying familiar metallurgical solutions to the design. The problem is that they are all limited by the limitations of the materials. The closest approximation to cut proof are the various titanium locks: https://www.tigrlock.com https://altorlocks.com It's possible to grind titanium (about the same as stainless steel). The main limitation of a metallurgical solution is that anything that can be fabricated can also be cut. Even the highest temperature alloys can be cut by an even higher temperature torch, such as a mythical portable plasma cutter. If overheating is impractical, freezing with liquid nitrogen can make it brittle enough to break. Like an arms race, the results are predictable and the effort usually futile. The best you can do with metallurgy is to make the lock too expensive to cut. Perhaps a different approach might work better. The problem faced by the average criminal is to steal the bicycle without destroying it. That's easy when the lock is an independently removable accessory. However, suppose the lock were designed and built as an integral part of the bicycle frame. Cutting the lock would destroy the value of the bicycle making the theft much less profitable. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 Then the thief chops the frame and sells just the components. Many thieves discard the frames anyway as they are easier to track/identify than are the components on the frame. Cheers |
#50
|
|||
|
|||
BBB-41 Powerlock Bicycle Lock
On 12/5/2017 11:00 AM, Jeff Liebermann wrote:
snip Perhaps a different approach might work better. The problem faced by the average criminal is to steal the bicycle without destroying it. That's easy when the lock is an independently removable accessory. However, suppose the lock were designed and built as an integral part of the bicycle frame. Cutting the lock would destroy the value of the bicycle making the theft much less profitable. I recall talking to Steve from S&S Torque Couplers. He would sometimes disassemble the frame then re-assemble it around a fixed object. Without the proper tool, it's difficult to separate the frame. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Ultimate bicycle lock system | Jeff Liebermann | Techniques | 5 | July 17th 10 05:04 PM |
Handcuffs as bicycle lock | Rocket J Squirrel | Techniques | 17 | September 23rd 08 10:31 PM |
SRAM Powerlock | John Verheul | Techniques | 17 | January 19th 08 10:29 PM |
Any suggestion for Bicycle Lock? | buddd | General | 5 | September 7th 05 05:59 AM |
Bicycle Lock Warning | smyrna45 | Techniques | 3 | September 19th 04 08:13 AM |