Random Thought Thread

WValtakis said:
Orcas punk great whites routinely🤯
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Hence affectionately known as the Killer Whales! Fun facts, their bite PSI is in the 18-19K range which is truly astounding and terrifying! For comparison, the mighty Great Whites and crocs are in the 3500-4000 PSI range, wolves in the high several hundreds to low thousands and the feared police / military GSDs only in mid 200 PSI... So how 'bout them apples? ;)
 
I've never understood the "psi" as it relates to bite force. Is this the force of the bite divided by the square inches of surface area of their teeth? Why is it a pounds per square inch unit. Why wouldn't it just be pounds? I bet I could develop a thousand psi of force with my pinky just using a syringe if the diameter of the plunger was small. That unit of measure, in a relation to bite force, has always been puzzling to me.
 
Nathan the Machinist said:
I've never understood the "psi" as it relates to bite force. Is this the force of the bite divided by the square inches of surface area of their teeth? Why is it a pounds per square inch unit. Why wouldn't it just be pounds? I bet I could develop a thousand psi of force with my pinky just using a syringe if the diameter of the plunger was small. That unit of measure, in a relation to bite force, has always been puzzling to me.
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I dunno, you're too much of an inquisitive egghead for me but while you are at it, have a go at this: the snap of a finger is faster than the blink of an eye!
 
Ok magnacut vs a trm atom both touched up on a spyderco brown ceramic

Magnacut cut through plastic coated thin wire of on a gift no problems or deformation, 20cv atom took some edge damage

Cut one side of a ham with Magnacut the other with 20cv atom.... hit the bone a good amount of times with both, Magnacut wins in this also no noticeable damage still nicely sharp


Liking magnacut more and more!

Still wish I had a folder or mule type blade in D3V to run against these 😉
 
Nathan the Machinist said:
I've never understood the "psi" as it relates to bite force. Is this the force of the bite divided by the square inches of surface area of their teeth? Why is it a pounds per square inch unit. Why wouldn't it just be pounds? I bet I could develop a thousand psi of force with my pinky just using a syringe if the diameter of the plunger was small. That unit of measure, in a relation to bite force, has always been puzzling to me.
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Agree. Plus, they should specify the tooth, canine vs molar will make a huge difference.
 
ferider said:
Agree. Plus, they should specify the tooth, canine vs molar will make a huge difference.
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There's def a difference on the "tooth" or "bite" of a steel at the same grit finish

Rex 45 finishes like a razor you would shave with ... not very grabby but cuts before you realize, another favorite of mine is s90v with its very grabby at a 400 grit finish. Almost seems to stick to what you are cutting and keep slicing through

But mostly at work I'm cutting through lite mediums like paper, foam , masking tape also thin plastic sheeting

In these different mediums you notice the feel and cut quickly!

(Edit I'm sorry ferider ferider .I think you guys were talking about sharks....

I posted before I'm 95 percent idiot lol)
 
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Nathan the Machinist said:
I've never understood the "psi" as it relates to bite force. Is this the force of the bite divided by the square inches of surface area of their teeth? Why is it a pounds per square inch unit. Why wouldn't it just be pounds? I bet I could develop a thousand psi of force with my pinky just using a syringe if the diameter of the plunger was small. That unit of measure, in a relation to bite force, has always been puzzling to me.
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normalisation per area allows apple to apple comparison. As you have said, animals will have different sizes of teeth and the same amount of force generated by two identical jaws will exert different pressure over a surface if the surface area of the teeth touching the receiving medium is different.

For instance, as you said you will require a very small amount of force to generate a large amount of pressure on a surface with a small needle. On the other hand, in order to generate a similar pressure on the surface with a larger surface, lets say a 5/16 inch rod, you will require a much higher force but the resultant pressure on the surface will be the same. So, if you only judge by the amount of pressure generated on the surface you will miss that actually a lot more force is required to create a similar pressure on the surface with a 5/16 rod.
 
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murat1983 said:
normalisation per area allows apple to apple comparison. As you have said, animals will have different sizes of teeth and the same amount of force generated by two identical jaws will exert different pressure over a surface if the surface area of the teeth touching the receiving medium is different.

For instance, as you said you will require a very small amount of force to generate a large amount of pressure on a surface with a small needle. On the other hand, in order to generate a similar pressure on the surface with a larger surface, lets say a 5/16 inch rod, you will require a much higher force but the resultant pressure on the surface will be the same. So, if you only judge by the amount of pressure generated on the surface you will miss that actually a lot more force is required to create a similar pressure on the surface with a 5/16 rod.
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Veterinary Science uses force (in N) for bite force modeling and characterization, as Nathan suggests. Tons of articles you can google ...

Maybe use of pressure / psi in the press has to do with how the bites were measured ? Just a thought.
 
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