Blade design + Passaround

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timos
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Blade design + Passaround

Post by timos » Mon Jan 30, 2017 11:49 am

I have a fun little project in store for you all.

I have a 300mm x 38mm x 3mm bar of san mai I will be sending out for heat treat sometime early next year. Once get through my current orders I will include this blade in my next batch to Peters heat treat. I wont name the steel until after the pass around. It will be a mystery :) All I will say is that it is a premium product only recently available outside of Japan.

If any members here wish to contribute to the design please feel free to post here or email your thoughts. You can also sign up for the pass around here and I will copy and paste once the official pass around thread is created.

The design parameters is pretty open ended.
1. Blade length could be anywhere from 160 to 250mm
2. Blade height anywhere from 30 to 38mm
3. Grind can be a 48" radius double bevel "s" type, convexed, or full flat grind. Due to the san mai it must be 50/50 though.
4. This could have a huge flat spot or very little.
5. The distance between front of handle and the choil is also a critical dimension for many.
6. Handle shape can be Octagon, D, western, oval, or even dove-wa if enough people want to see this in person.

I will keep the type of steel and RC hardness a mystery so that we can really get some objective analysis going.
I will also post a photo of each step as a guide and idea as to what goes into my method of producing such a knife.

This is sort of a long term project but for those with the patience and insatiable desire to try new things it will be worth the wait ;)

timos
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Re: Blade design + Passaround

Post by timos » Mon Jan 30, 2017 12:00 pm

I am carrying this thread over from the old forum.
We settled on TWO different designs.
Here is the Ktip line knife in an as yet undisclosed high carbon steel
Image

Here is the proposed long petty in an as yet undisclosed stainless clad high carbon core steel
Image

I am throwing these two into my next heat treating batch, hoping to finish them by spring time :)

J david
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Re: Blade design + Passaround

Post by J david » Mon Jan 30, 2017 6:12 pm

This sounds like a great idea. I think most people are too concerned about steel type. Often, confirmation bias dictates opinion on performance. I will be interested in following this closely.

I love the profile on the petty and will be in the market for one soon.

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Jeff B
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Re: Blade design + Passaround

Post by Jeff B » Tue Jan 31, 2017 12:48 am

The petty looks great Tim! One note though, we in the J-knife world know mm better than inches now, SO CONVERT! ;) :D
If God wanted me to be a vegetarian he wouldn't have made animals taste so good.

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mauichef
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Re: Blade design + Passaround

Post by mauichef » Tue Jan 31, 2017 3:27 am

Liking the look of the KTip Tim. Although I personally would like to see it flatter.

timos
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Re: Blade design + Passaround

Post by timos » Tue Jan 31, 2017 9:19 am

38 mm high at the heel!!

mauchief i agree that edge needs a bit of tweaking also the tang area. I am also considering a touch more slim ..that Ktip is about 49mm at the heel :shock:

raleighcook15
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Re: Blade design + Passaround

Post by raleighcook15 » Wed Apr 19, 2017 11:05 pm

That k tip looks fun! Curious about the rest of the measurements for it

timos
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Re: Blade design + Passaround

Post by timos » Thu Apr 20, 2017 7:38 am

I Will have to measure the K-tip when it gets back from heat treat. I dont remember the dimensions and my cad template somehow got saved over with a longer more narrow design....hmm!
First thing I will do when I get it back is check for straightness...clean the blade up and get a feel for the profile on the board. Then I will make slight changes to the profile before I decide what kind of grind it should have.....I am thinking of breaking in my new 4' radius platen to give slightly concave bevels and then use a low angle wide secondary bevel...force a crazy patina, maybe make it an Mirepoix demon. I envision chopping in confined space with this blade and a tip can dice onions with the best of em.

In any case I will be able to pass around the K-Tip soon. If any one has a handle or want to make one to go with the blade to also pass around let me know!

Image

Georgek
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Re: Blade design + Passaround

Post by Georgek » Thu Apr 20, 2017 8:52 am

Looking good and sounding very promising Tim!

I will be waiting for that passaround!

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mauichef
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Re: Blade design + Passaround

Post by mauichef » Thu Apr 20, 2017 12:23 pm

What size handle do you think it needs?
Meanwhile....please put me on the Pass Round list Tim. Getting my request in early!

raleighcook15
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Re: Blade design + Passaround

Post by raleighcook15 » Sun Apr 23, 2017 8:31 pm

Please keep me in mind for the passaround. I'm excited for this blade.

timos
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Re: Blade design + Passaround

Post by timos » Wed May 10, 2017 7:25 am

OK...Time For Some Lists!
I just got word that the K-Tips are on the way back to me....I guess it was a bear to get those straight.

K-Tip Pass around List:
Feel Free to go hard with this one at home or work...This is a line knife. Once I have the blade done I will be sending to Bensbites, he will be providing a handle for this one to also pass around.

GeorgeK
raleighcook15
mauichef
J David
Gopherbroke
easilver
robstreperous

Image


Also Sneak Peek of a Ko bocho pass around that is just around the corner! This knife is a collaboration:)
This blade is extreme thin, FFG to .005 and then hand sanded to a zero edge...so a very light convexing. Ghost tip all the way ..
This blade and finish I will call ghost cloud. You wont want to take this one to work...it should be a pleasure to use when you have the time to care for a laser edge

J david
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Re: Blade design + Passaround

Post by J david » Wed May 10, 2017 9:07 am

Me too please, Tim. That ko bocho looks awesome by the way.

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GopherBroke
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Re: Blade design + Passaround

Post by GopherBroke » Wed May 10, 2017 9:34 am

Me too please.

easilver
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Re: Blade design + Passaround

Post by easilver » Wed May 10, 2017 3:27 pm

Please include me also.
Ed in L.A.

Robstreperous
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Re: Blade design + Passaround

Post by Robstreperous » Wed May 10, 2017 4:19 pm

Hey Tim. That Ko bocho looks extremely cool.

Keep me in mind if you decide to do a passaround on that one too?


---Rob

timos
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Re: Blade design + Passaround

Post by timos » Wed May 17, 2017 5:50 am

I got these blades back and couldnt resist grinding one out. A couple hours and a few ceramic belts later this is what I have:
Image

Ive got a nice thin tip with a beefy heel. The distal taper is pretty much set and this time, I included distal taper along the edge too.
I ground this blade for maximum versatility in a confined space. I am very interested to see how this steel performs in all the applications you guys may throw at it.

The knife at top is a long petty, just happened to be sitting there...still missing a ferrule cap...I traded it to my brother in law for plowing me out all winter :)

timos
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Re: Blade design + Passaround

Post by timos » Mon Jun 05, 2017 2:32 pm

OK, this blade is headed to Ben's to get one of his sweet handles installed.
Image

Bensbites
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Re: Blade design + Passaround

Post by Bensbites » Mon Jun 05, 2017 2:46 pm

viewtopic.php?f=47&t=1187

You folks can take a look at my current inventory and let me know what looks good. I am open to suggestions, but can't promise anything.

Ben

Georgek
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Re: Blade design + Passaround

Post by Georgek » Mon Jun 05, 2017 9:31 pm

Ben, these all look great, but my favorites of the bunch are #5, 7, 8, 10 and 11 from the left. Just sayin

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