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Lancelot Chan
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Location: Hong Kong
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PostPosted: Tue 16 Oct, 2018 10:27 am    Post subject: Sinosword Qijian test cut         Reply with quote

https://youtu.be/k67l9CfqJDs

Testing out a Sinosword Qijian after sharpening to 9 micron edge, vs 13 chopsticks cored extra large upper arm difficulty newspapers roll.

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Ian Hutchison




Location: Louisiana / Nordrhein-Westholland
Joined: 27 Nov 2007

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PostPosted: Tue 16 Oct, 2018 11:53 am    Post subject:         Reply with quote

Nice looking sword! I've been happy with Sino sword in the past as well.
'We are told that the pen is mightier than the sword, but I know which of these weapons I would choose.' - Adrian Carton de Wiart
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Lancelot Chan
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Location: Hong Kong
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PostPosted: Tue 16 Oct, 2018 12:06 pm    Post subject:         Reply with quote

Ian Hutchison wrote:
Nice looking sword! I've been happy with Sino sword in the past as well.


Thanks for watching. This one is for my friend. I've one custom nodachi still under production by them.

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Jean Thibodeau




Location: Montreal,Quebec,Canada
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PostPosted: Thu 18 Oct, 2018 4:48 am    Post subject:         Reply with quote

Lancelot Chan wrote:
Ian Hutchison wrote:
Nice looking sword! I've been happy with Sino sword in the past as well.


Thanks for watching. This one is for my friend. I've one custom nodachi still under production by them.


That 9 micron edge I assume would make a razor blade have an inferiority complex !

How durable is the edge ? In other words does it stay 9 micron for a reasonable number of cuts ? And I would think that a lot would depend on the degree of abrasiveness of the cutting material.

Chopping into an iron nail would probably do some dulling of the edges I think.

After some non-abusive use this super-sharp sword might retain a still sharp working edge, but it's interesting to see how sharp one can get a steel blade before it develops a feather edge that has to be stropped away and probably limit how sharp one can get a specific steel alloy at a specific RC hardness?

A harder edged steel might be able to get very sharp but at the price of being a brittle edge, maybe ?

Anyway, very scary cutting I've come to expect from your video demonstrations.

You can easily give up your freedom. You have to fight hard to get it back!
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Lancelot Chan
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Location: Hong Kong
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PostPosted: Thu 18 Oct, 2018 5:29 am    Post subject:         Reply with quote

Hello! Thanks for watching too.

For most swords I keep at maximum 9 micron edge but for my personal Longship Armoury swords, I keep them at 3 micron, going a bit overkill I admit.

When I sharpen them to these level of fineness, the apex has to be formed with a large enough angle for the edge to hold against slicing felt block, which is kinda a test to see if the edge is sturdy enough for simple slicing through non-abusive material. If the edge does not hold, the felt block will roll the apex and I will have to keep making the apex more sturdy by increasing the size of the micro bevel. With 9 or 3 micron, I have to finish the apex at 40 degree per side if I want them to make it through the test!

How long do they hold in cutting ordinary targets like the newspapers roll and chopsticks core (or any other flesh and bone stuff)? 1 cut. Happy After 1 cut, the apex will either roll a little bit or got abraded away. However, it will still cut very well even at this state, as "working sharpness". It has a very long working sharpness duration.

A harder steel with fine grain, like my longship swords at 61 to 62 HRC, will be able to support a finer edge, like 3 micron at 40 dps. Normal swords are better off with 9 micron at the same degree, at 58 HRC or below. At 52 HRC, the micro bevel of 40 dps has to be a bit larger in order for it to hold. On the other hand, some steel alloy like 3V can go hard and still pretty tough in the same time. As a result, the size of the micro bevel needed to hold through the felt block test will be extremely small for such high hardness.

I've sharpened knife at 58 hrc to very acute angle (like 10 to 15 degree per side) at 3 micron before, but the edge apex will roll in the first cut even against butter cake. LOL Knife at 65 HRC, though, will be able to hold the 3 micron apex at whatever angle I give it. On the other hand, for swords that will cut through bones, I will do 40 DPS with the final grit to make sure they have a better chance to survive without chipping or rolling.


Jean Thibodeau wrote:
Lancelot Chan wrote:
Ian Hutchison wrote:
Nice looking sword! I've been happy with Sino sword in the past as well.


Thanks for watching. This one is for my friend. I've one custom nodachi still under production by them.


That 9 micron edge I assume would make a razor blade have an inferiority complex !

How durable is the edge ? In other words does it stay 9 micron for a reasonable number of cuts ? And I would think that a lot would depend on the degree of abrasiveness of the cutting material.

Chopping into an iron nail would probably do some dulling of the edges I think.

After some non-abusive use this super-sharp sword might retain a still sharp working edge, but it's interesting to see how sharp one can get a steel blade before it develops a feather edge that has to be stropped away and probably limit how sharp one can get a specific steel alloy at a specific RC hardness?

A harder edged steel might be able to get very sharp but at the price of being a brittle edge, maybe ?

Anyway, very scary cutting I've come to expect from your video demonstrations.

Ancient Combat Association http://www.acahk.org
Realistic Sparring Weapons http://www.rsw.com.hk
Nightstalkers http://www.nightstalkers.com.hk
View user's profile Send private message Visit poster's website


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