jikangchen
ALCOHOL
- Joined
- Jan 16, 2003
- Messages
- 78
Do you still remember my Duty broken when throwing? Here's the older thread.
Thread1
uty coming:http://www.bladeforums.com/forums/s...ixed-blade-hunter-size-utility-knife-“本”-Duty
Thread2: Tested and broken and design changed
http://www.bladeforums.com/forums/showthread.php/1166410-New-knife-本-Duty-Tested-and-broken
I really got/gained much during the course.Thanks men, for your advices and helping.Now the new Duty is coming,I'm very glad and pride to show you friends my Duty.
Does it looks better?
properties:
Overall Length: 21cm (8-1/4")
Blade Length:10cm(4",from tip to guard)
Cutting edge: 8.9cm(3-1/2")
Blade thickness: 4mm(.16" at ricasso);flat grind to 0.4mm when beveled;hand sharpened with belt grinder
Blade Steel: Crucible CPM S35Vn
HeatTreat: Vacuum oil quenched with two times tempering (No cryo this time),high frequency annealing at the first rivet hole
Hardness:58-59HRC @blade&handle; 48-50HRC@first rivet hole
Blade Finish: StoneWashed
Handle: 3D micarta
Rivet: 1mm thick Copper tube(4mm inner/6mm outer)
Weight: knife only=147g/150g with/without handle grooves, sheath=56g
Forgive my english,I'm not a good/obedient student in college.I have to write the thread in brief words.
Let's enjoy some pics.
As the proto was damaged in the hole when throwing,We got much ideas to change the lightening mothod,as I posted in the early thread.I'm not insisting knife throwing,I just want to strong the knife without increasing the weight,and keep the gravity center there.To make my design more wise.
Now step by step:
The proto knife broken at the first rivet hole. there's the weakest area of the knife.so the changes in the new design :
A)New lightening (Was it used by other makers before? Could I name it G.E.style lightening? )
The proto knife handle was lightened uniformly. for the new design, we lighten the handle differentially:
No lightening around the first rivet;gradual lightening from 10mm after the first rivet to the middle one, with H-section(Ball end milled)
Skeleton between the middle rivet and the rear one.
See what we got:
B)Chamfer everywhere we need no edge，as we can see in the upper pics.
After stonewashed:
Yes, there's a small piece beside the blade, it's the lightened area between the second and rear rivet.It will be a dogtag goes together with the knife.
C) egg shaped handle
I like it very much, it feel much more better in hand.We can't resist a comfortable handle.
It's not a High-Tech,but need to do.
That's also why the top of the micarta scale is not at the center of the handle.But that makes this knife feel amazing.
Sorry, we can't photo out the exact shape of the handle's cross profile,because it changes follow the profile variation of the handle from front to rear,Unless we cut it.But you can feel it easily.
D)Handle grooves. Maybe it's a very personal liking.
it could be cleaned easily, and feels good.No groove handled are available too.
E)High frequency part annealed handle
To make the knife more hard to be broken.I part annealed the handle at the first rivet this time.
I think it's not very needed.
Sorry for the horrible photo.
Now,It's ready. My second knife after Sunshine neck knife, my Duty/Ben.
The shape, What I am insisting that should be beautiful after comfortable.
Let's see how the gravity center changed.
Before
After
Friends,I'm very happy.It seems my effort is worth it.My Duty became more comfortable in hand, more beautiful in eyes, more stronger in use. less in weight increasement(less than 4g).almost no change with the gravity center. That's what I want.
Thanks for looking!
