TwoSun TS321 14c28n

O

old4570

Banned By Request
Joined
Jul 28, 2010
Messages
803

It's 70% humidity ...

TwoSun TS321 ..
Overall Length: 8.03"
Closed Length: 4.61"
Blade Length: 3.11"
Blade Material: 14C28N
Blade Thickness: 0.150" ( Mine measure 0.14" )
Plain Edge ( Flat Grind )
Black G10 Handle
Liner Lock
Weight 123 grams

What is there to complain about ?
Seriously , aside from possibly the blade steel ( edge retention ) I cant find anything to really complain about .
The factory edge was some what FUBAR , but no where near as some . On one side there is still about 1 inch of FUBAR because of the way the edge was ground .

Slicing rope !

It was 70% humidity ..
And the paper did suck in some moisture ..
@ 150 slices I went inside and the knife just passed the paper slice test .
At 200 the test was very iffy ! So ill just call it a soft fail .
Damned 2022 has been humid !

Knife has a fresh wet stone grinder edge , I havent changed the factory bevel angle ...
So ASAP I will cut / slice rope again .
 

A) I reground the edge to match the factory angle
B) I checked the angle of the edge after the slice test
C) The angle was ( Around ) 15 degrees .. Due to the way the edge is ground , it's hard to be 100% .. But that is very tight for 14c28n .

Slicing rope , we got a 350 slice fail with a rolled edge . ( @ 15 degrees )
It's a very thin blade at the edge ( behind the edge ) and for what ever reason , this one got a 15 degree bevel .
Yeah , the blade steel wont support that . And I will have to retest at a later date with something a little more sensible like maybe 18 degrees .
The edge did strop back strong ... If that matters . Performance was above average ( good range ) .
And it is a very slice 'y blade design .

Ok , I like the knife ... I like everything except the 15 degree bevel .. ( It just rolled too well )
 
Very cool. Thanks for the good, honest review and cut test! That stuff takes a lot of time. Sounds like it did pretty dang well everything considered!
 
Yes , @ 15 degrees it's a decent result ..
But the edge is a little fragile @ 15 degrees ..
If all you wanted as a knife to cut relatively soft things , then the edge could be the cats meow !
I will put a 18 degree edge on the knife and see what happens .
 
Yea that's a pretty narrow edge to come on a production knife. So far I've noticed that the edges that have come on the Twosun examples I've seen are pretty good. Better than many anyway. I'll be interested to see what happens when you go to 18 degrees per side!
 
Ok . A little more ......
I put a 18 degree bevel on the knife ..
And cleaned / stropped the edge like supper hard ..
It rolled badly enough to fail at 100 slices ... ( ? ) Hu ?

So I cleaned the edge , stropped it shaving sharp , & ......... Rolled at 100 slices badly enough to fail the paper slice test !

Oh dear !

So I put it back on the wet stone grinder .....
And I took notice of the burr when grinding ...
It was quite a burr ... It took twice as much effort to clean as I usually do ..
My kingdom for a rockwell hardness tester ... ( I cant afford one )
But my guess is ............ Soft .. Too damned soft !

So why did 15 degrees work ?
Maybe the edge was fine enough that , even though it was rolling . It could still cut ?
Or it was the wet stone grinder edge ?
Either way , the knife wears a wet stone grinder edge now .
 
old4570 said:
Ok . A little more ......
I put a 18 degree bevel on the knife ..
And cleaned / stropped the edge like supper hard ..
It rolled badly enough to fail at 100 slices ... ( ? ) Hu ?

So I cleaned the edge , stropped it shaving sharp , & ......... Rolled at 100 slices badly enough to fail the paper slice test !

Oh dear !

So I put it back on the wet stone grinder .....
And I took notice of the burr when grinding ...
It was quite a burr ... It took twice as much effort to clean as I usually do ..
My kingdom for a rockwell hardness tester ... ( I cant afford one )
But my guess is ............ Soft .. Too damned soft !

So why did 15 degrees work ?
Maybe the edge was fine enough that , even though it was rolling . It could still cut ?
Or it was the wet stone grinder edge ?
Either way , the knife wears a wet stone grinder edge now .
Click to expand...
Hmmm, interesting results. Thanks for doing the testing! Yea I do wonder what hardness most of their 14c28n blades are being run at. So in one of your tests you got 350 cuts before the edge rolled enough to fail? That's pretty damn good. But yea at 15 degrees it didn't do so well. Not terrible, but not great. However, you were able to get the edge back to shaving sharp just by stropping after it failed to cut paper? Are you using a standard leather hand strip or a powered leather belt?
 
I have cow hide , and kangaroo ..
+ I have compound on one strop ( cow hide )
I guess I have 5 different leather surfaces in total .
Some times , pure leather is enough to get the edge back ..
Some times I need a few passes over compound .. ( The green Chinese compound found on Ebay )
Softer steels look to need less stropping ..

+ If you have a really decent edge , then that also requires less work to restore .
A heavily used and radiused edge , probably wont strop back .
I have seen some real shockers ! ................

I did order those Japanese files .. Various Hardness levels for testing steel .
Wont give you a precise result , but at least some idea of how buttery the steel is - or not !

Files.jpg
 
As a rule, the smaller edge angle will cut better than a bigger edge angle. Simple as that. The downside of a small edge angle is usually chipping, but 14c is pretty tough so it should be fine at 15°.
 
old4570 said:
I have cow hide , and kangaroo ..
+ I have compound on one strop ( cow hide )
I guess I have 5 different leather surfaces in total .
Some times , pure leather is enough to get the edge back ..
Some times I need a few passes over compound .. ( The green Chinese compound found on Ebay )
Softer steels look to need less stropping ..

+ If you have a really decent edge , then that also requires less work to restore .
A heavily used and radiused edge , probably wont strop back .
I have seen some real shockers ! ................

I did order those Japanese files .. Various Hardness levels for testing steel .
Wont give you a precise result , but at least some idea of how buttery the steel is - or not !

Files.jpg
Click to expand...
Hmmm looks like my reply to this post never ended up posting. Thanks for the insight. I think that since getting back into knives after almost 10 years I overestimated how much stropping is needed to get an edge back. I think I was over-stropping the hell out of my edges and not getting good results. I used to get amazing stropping results but since coming back I was stropping each side like 10 times, and then moving to the other side and doing 10 more and spending too much time on each side. I really should be doing more like one or two strops on one side and then going to the other side shouldn't I instead? And do that till I get my edge back, or if it's not coming back go back to the stones.
I'll be interested to see how those hardness tester files workout for yea!
 
I do one side after the other as I use a lot of pressure ..
If you do light passes , then doing half a dozen one side and half a dozen the other side should be fine ..
But I do it like Im sharpening a cut throat razor .
 
old4570 said:
I do one side after the other as I use a lot of pressure ..
If you do light passes , then doing half a dozen one side and half a dozen the other side should be fine ..
But I do it like Im sharpening a cut throat razor .
Click to expand...
Ok I see. Speaking of which I need to get me a straight razor one of these days. But yea, I think I was just focusing a little more on quantity than quality.
 
The most important thing is , to always do it the way that works for you ..
And only change if there is a better way . ( That's better for you )
 
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