Blade seating, what is proper. What's your opinion?

[Knifeologist]

Another way to ask the question, when is the blade to long for the handle when closed. Blade to handle ratio is an important aspect of knife construction and most makers want to get has much blade into the handle as possible. I understand that there is a rule of thumb, that the blade should be as long as possible provided you can run a business card over the knife when closed and not have the tip of the blade catch on the business card. However, others feel that cutting it that close is not proper blade seating. The thought is that, rubbed against something that is not straight like the curve of a finger or loose fabric, the blade can catch and be a hazard. With this school of thought I have never seen an associated measurement for what is acceptable/correct. Appreciate any thoughts or comments from both makers and users.

 

[Dawkind]

I've got a couple that if I run my finger along the end with the blade closed and barely press as I go, I get cut.....too long!

I've also got a couple of folders with an 'open' back or stand-offs that when closed any pressure will cut....not good either.

Ask me how I know of this....

 

[Knifeologist]

Will they pass the "business card test" and, if so, what would be the correct depth below the edge of the closed knife be?

 

[Park Swan]

The blade and handle should be designed in such a way that the knife looks and feels balanced open and closed. If it pokes you... bad design, clearly too long.

 

[Scurvy092]

Will they pass the "business card test" and, if so, what would be the correct depth below the edge of the closed knife be?

Plenty of knives will pass the business card test with ease and slice the hell out of your finger if you run your finger over it.

I doubt there will ever be a universal set depth as everyone's tastes are different and everyone's fingers are different.

The business card test should be the absolute bare minimum but don't be shocked if that's not good enough for everyone.

 

[Lorien]

one reason I like backspacers as opposed to standoffs. Much harder to build a knife that way, but I personally think it's worth it

 

[Dawkind]

Plenty of knives will pass the business card test with ease and slice the hell out of your finger if you run your finger over it.

Exactly...

one reason I like backspacers as opposed to standoffs. Much harder to build a knife that way, but I personally think it's worth it

Yes, and yes.....that tip-down carry 'surprise' as I reach into my pocket.

 

[Knifeologist]

Seems the business card test may be appropriate for an art knife that will be in the safe/display but a different standard (though there is none, a standard that is) should apply to a knife that will be used.

 

[john april]

i agree knifeologist. if it is a carry knife the finger test should apply. i am not into folders, but it just seems logical.

 

[Kevin Jones]

While maximum blade to handle ratio is important IMO, a folder needs to function and carry safely. The 'finger test' should trump a the credit card test IMO.