I agree it was not a very good testing of the Spyderco knives, they had so many problems getting the results they did get.guywithopinion wrote: ↑Sat Sep 08, 2018 10:20 amTheir specific test seemed pretty poor to me. They had no way of controlling the load, and it ramped up very fast. I'm sure there could be a huge variation in the actual load and what their gauge spiked to. Also they had no way of controlling how far up the handle it was pulling. 100 pounds a quarter inch past the pivot on one knife is a lot different than 100 pounds 2 inches past the pivot and resulting in failure.
Also on some backlocks, the cable caught on the backlock, essentially forcing it into the blade, and causing the entire knife to snap in half. I suppose that makes the backlock "strong" for exactly that scenario, but doesn't reflect the behavior of a load that is not being exerted on the lock itself.
Edit: this is the video I'm referring to: https://www.youtube.com/watch?v=ERxHUXAFVs4
I agree. This kind of "testing" is basically worthless except for entertainment or publicity value.fanglekai wrote: ↑Sat Sep 08, 2018 10:35 amIt's only useful if the testing is done properly and if whatever is being tested actually makes sense to test. Several things to consider:
A single sample isn't enough data.
Are all the right variables controlled?
How is the force applied and where? Is it testing slow loading with a linear increase, distributed loading over a larger area, static loading, etc. Different loading will yield different results.
Is the same testing applied to every sample? For example, distance from pivot (calculate applied torque), same rate of loading (linear, exponential, etc).
Designing experiments isn't easy. There are many textbooks and academic articles on the subject. Proper experimental design, testing including data collection (sensors, equipment tolerances, etc.), and data interpretation (statistics, analysis) requires a lot of study and work. If it's not done right all you end up with is junk data and incorrect conclusions.
I haven't seen any rigorous testing yet but maybe someone is doing it right.
Are you willing to share more about this? Some of us are fascinated by such machines, testing protocols, and results.
Lets just understand that Spyderco does what testing is needed for their products, and how they feel the testing needs to be setup for the tests.attila wrote: ↑Sat Sep 08, 2018 3:37 pmAre you willing to share more about this? Some of us are fascinated by such machines, testing protocols, and results.
I understand if you aren't willing (not bashing inferior locks/manufacturers or some other reason), but we are always curious and would love to know more.
The problem is they aren't purporting to be solely entertainment. It's not a question of "ignore it if you don't like it." They're deriving conclusions from faulty data and spreading those views.