Persian lock MBC rated?

Keith

Spyderco's website doesn't show the Persion as MBC rated. If the 140 in.lbs./in is correct then it doesn't fall into the MBC category which requires 200+.

* Edited to add that the 2004 Spyderco catalog includes a list of the "knife designs geared toward MBC use" - the Persian is not included in the list.


David
 
Gentlemen,
If I remember correctly Sal had told me the Persian tested at 407 in/lbs, a strong lock but not MBC....Take Care...Ed
 
Ed,
Thanks for the info. I'm still carrying that Persian around. I really like the knife, you and Sal did real good in bringing this knife to market.

407 in/lbs. for the Persian.

What is the minimum for MBC ratings? Never have heard or read it anywhere though it's mentioned often enough.

Seems I'll have no issues with the Persian at 407 in/lbs of lock strength anyway.

Brownie
 
Here is Sal's review of the blade lock strength rating system from an older thread:


"quote"

Spyderco has set up our own in-house standards on lock strength to provide our own parameters for manufacturing.

We have established an in house test that breaks knives and records the break. We get a graph and numerical results of the break.

A knife is put into a vise and a probe applies pressure to the handle. The distance from the pivot pin to the probe is measured in inches. This is the leverage arm. If the probe takes 100 lbs of pressure to break the lock and the probe is 3 inches from the pivot, then the amount of force is measured as; "3 inches times 100 lbs equals 300 inch lbs of force to break the lock (or blade or ?).

We then established a standard for our own knives. We decided that we would use the inch lbs of force to break the lock times the length of the blade to establish thresh holds.

25 inch/lbs of force for every inch of blade length would be considered a "light duty service". That means that a 2" blade needs to hold 50 inch/lbs of force to meet the "light duty service" requirement.

50 inch/lbs of force per inch of blade would be "medium duty service". This means that a 2" blade times 50 inch/lbs of force equals a minimum of 100 inch/lbs of force to break the lock.

"heavy duty service" is 100 inch/lbs of force per inch of blade is required to break the lock. This means that a 2" blade times 100 inch/lbs of force equals 200 inch/lbs of force is required to break the lock.

MBC is 200 inch/lbs of force is required for every inch of blade length to break the lock. This means that a 2" blade times 200 inch/lbs of force equals 400 inch/lbs of force is required to break the lock.

This is not intended for any other knife companies or custom makers. It is our own standard that we test to with every model in every shipment or run in our own facility.

I hope that helps.

sal

"endquote"


I hope this helps too :)

David
 
First, thanks Ed for bringing such a wonderful design to the production market. Sal & Co. did an amazing job of producing it -- IMO the quality is outstanding.

The way I understand it, then, is that at 407 inch pounds, with a 3.5 inch blade, the Persian exceeds 100 pound per inch and is therefore "heavy duty service" rated. Is that right?
 
My calculator says thats rated at 116.285.

Certainly enough to considered heavy duty.

4 s ter: Thanks for the info, I appreciate it.

Brownie
 
The numbers are probably somewhat arbitrary. I mean, I don't think that the Persian is necessarily any less suited to SD because the lock is rated at 140+ instead of 200+ That's a lot of lock strength.
 
IIRC Sal has also said, although I haven't tried to find the link, that lock dependability is more important than strength. Apparently, it is more often the pivot pin that fails, through shearing or tearout from the scales, than the lock which fails. Remember, for years the Endura and Delica were the martial arts models, even to the point of having trainers produced. Neither of them meet the MBC requirements, but the locks are still very strong and dependable.

David
 
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