AMuzi wrote:
On 7/22/2020 9:16 PM, bob prohaska wrote:
John B. wrote:
On Wed, 22 Jul 2020 09:11:50 -0500, AMuzi wrote:

or maybe fake news

https://cyclingindustry.news/scienti...bike-security/

See
https://bgr.com/2020/07/21/uncuttabl...cutting-tools/
for a demonstration of "cutting" the above material
--

I vote fake. The description says aluminum, the sparks say steel and the
grinder says soft. Not sure if the fake is intentional or accidental, but
the story so far does not add up.

Hope this doesn't offend too much,

bob prohaska


In my capacity of regularly removing 'impenetrable' locks
with lost keys from bicycles, I scoff at the term 'cut proof'

Here's an example. There's a cute elegant little lock with
14mm tempered aluminum shackle and body, 'can't be cut with
disc grinder'. Yeah, so what? There are many methods for
many materials. If the thief with a battery disc grinder is
thwarted, the next guy will break it differently.


Modern abrasive disks are remarkably good. Add a decent battery
powered drive and it's probably the best attack off the shelf.

I have to admit the idea of a composite material has some merit.
A mix of something hard to resist sawing and shearing plus a
material that "loads up" abrasives to make grinding difficult
might be resistant to quick attack. I don't know of such a combo,
most metals hard enough to resist shearing won't load a wheel.
Those that will load a wheel are soft enough to saw or shear.

A resin-bonded SiC wheel is difficult to fend off directly. A
lock material (or structure) that causes rotary tools to bind
and grab is the best defense that comes to mind. I've broken
lots of abrasive cutting disks that way....

For the curious, there is a YouTube channel by "Lock Picking
Lawyer" where various gadgets, including bike locks, are tested.

bob prohaska