Balance Point Relocation.

T

TAGannon

Joined
Oct 14, 2009
Messages
1,377
I decided to do a little more work on the BK2 I posted a couple days ago showing the inside cut out and the butt removed. I squared out the inside and followed the contour of the bottom of the handle, removing another 1/10 oz bringing the total weight savings to 1 oz exactly. I had nice pictures of the stock and modified knives without handles on them, but I dropped that old camera and well, it is now in the trash because it was a floppy disk camera and the reader no longer reads the disk, which means the photos are gone. I'm too tired to take off the handles again and re-take those.

I did think you guys would find it interesting to see how far I changed the balance point with my little project.

104godi.jpg

It took a nice long time just to get them to balance. Yes, both knives are on the aluminum tubing.


10z03dx.jpg

See, I would not lie to you.


qod0sj.jpg

See how the tubing is visible through the front handle bolt hole on the knife on the left? Look
how far back the hole is on the right. If Toooj or someone could tell me with certainty, what
that divot is on the blade just south of the grind shoulder, I'd love to know. I'm thinking it was
a pulled test piece for heat treat and that is the Rockwell impression. It is not present on the
other BK2 and not on any other BK I've stripped. It his a hole with a slightly raised halo
effect around it that you can barely see in the photo. That would be consistent with something
being forced into the steel.


sowr5k.jpg



971ppv.jpg

Just for comparison sake, the jimping is exactly in the same location on each knife. I mean line
for line. I did not plan that, but it just worked out that when I put the knives on top of each
other, everything lined up perfectly.


33w8nld.jpg

This shows how far forward the point is on the stock knife, accounting for the added weight it has to balance from the handle.

m9ta39.jpg

I added this one just because I thought it looked cool.


 
Last edited:
interesting.

you should links your posts together with URLs, so that there is a way to follow the antics ;) otherwise, i don't think most people will see the whole show, and story line.

(or just possibly just extended the original post, one big story in one place [yeah, i'm lazy ;> and don't wanna hunt them down myself to see the earlier material again])
 
Very cool. Would be cool to put a taper on the handles and either make some custom ones or some angle liners to keep the micarta/grivory ones parallel. Thanks for the pics.
 
Bladite said:
interesting.

you should links your posts together with URLs, so that there is a way to follow the antics ;) otherwise, i don't think most people will see the whole show, and story line.

(or just possibly just extended the original post, one big story in one place [yeah, i'm lazy ;> and don't wanna hunt them down myself to see the earlier material again])
Click to expand...

Okay, Your wish is my command Bladite. Check out the initial post, I edited it to include a link. Is that what you are looking for?
 
If Toooj or someone could tell me with certainty, what
that divot is on the blade just south of the grind shoulder, I'd love to know. I'm thinking it was
a pulled test piece for heat treat and that is the Rockwell impression. It is not present on the
other BK2 and not on any other BK I've stripped. It his a hole with a slightly raised halo
effect around it that you can barely see in the photo. That would be consistent with something
being forced into the steel.
Click to expand...

TAGannon,

I do not believe it is Rockwell Indentation. It is too big. We use cold rolled steel so the surface is better than hot rolled. Having said that, surface inclusions still find their way onto the steel. This what I think it is. It may also be a processing mark but I do not know which process. Once the makeup is off the face, reality strikes for good or bad...
Appropriate for knives and women.

TAG,
How is the balance point with the handles/fasteners on the blades? And is it where you want it to be?


Best Regards,


Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
 
Your subfractional stress vectors look pretty good (just eyeballing it) and one would think any harmonic distortion would be well distributed throughout the blade when used with an oblique thrusting action. If you'd like to send it to me for some closer observations and nondestructive testing, I'd be willing to work it in free of charge. No shit.

randy
 
Toooj said:
TAGannon,

I do not believe it is Rockwell Indentation. It is too big. We use cold rolled steel so the surface is better than hot rolled. Having said that, surface inclusions still find their way onto the steel. This what I think it is. It may also be a processing mark but I do not know which process. Once the makeup is off the face, reality strikes for good or bad...
Appropriate for knives and women.

TAG,
How is the balance point with the handles/fasteners on the blades? And is it where you want it to be?


Best Regards,


Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
Click to expand...

Toooj,

Thanks for the info. It would be interesting to see just where that indent came from. It certainly is very uniform and does not look like an accident.

I love the balance point now. There is a difference when chopping with the before and after model. I feel as if the after has more of a punch and bites in a bit more.

Since my modification, I've added SS hardware. I'll get more and add it to the before model and balance them both again. Though, to be fair, I'm using handles that I scored on the after model. I removed a negligible amount of weight though.

Thanks again,
Tom
 
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