TLDW #22 - Repair broken Natural Waterstone with Urushi
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- Опубліковано 2 жов 2024
- **WARNING: This is the longer process version intended for serious students of knifemaking. Carving a cypress base and repairing a broken natural Japanese waterstone using urushi lacquer. The stone is a Kumamoto binsui-do, approximately #700, from Monotaro in Japan. Urushi is from Watanabe~san in Tokyo: urushi-watanabe...
**WARNING: This is the longer process version intended for serious students of knifemaking. Carving a cypress base and repairing a broken natural Japanese waterstone using urushi lacquer. The stone is a Kumamoto binsui-do, approximately #700, from Monotaro in Japan. Urushi is from Watanabe~san in Tokyo: urushi-watanabe.net/
I loved this i miss your vids theyre soo spaced would like to see a traditional dagger like the one on your sight
thanks! i have been building a new forge for the past several months but plan to be back forging soon, lots of projects on my list! here is the forge so far: islandblacksmith.ca/tag/island-forge/
🙏❤️🙏 I have missed your shavings.
I have many wood working tools ,however I prefer my Japanese wood working tools over any other,
Love this vid! Thanks!
wow that is now good for paperweight, that crack will ruin everything.....sadly some folks will follow your method...but that is just not ok for a 500$ knife to get shattered by a 35$ broken thurd.
this is a centuries-old method used to repair not only broken stones, but to fill large gaps where harder mineral deposits must be dug out to prevent scratching...this stone has been polishing traditional swords for several years since the repair.
Loved the video. Looking forward for more in future.
Hi what exactly is urushi ?
Why are the chisels curved?
they are called sayanomi, designed for carving out the inside of a japanese sword scabbard...
My grandfather (he is a Japanese mechanic) and when he breaks a stone to flatten engines heads he takes a cold chisel and slowly remove the part that broke to gather the dust and small bits to grind it into a polishing powder
right on! i save all the dust from dry polishing work, most of the coarse stones go into my clay mixture for yaki-ire...
@@islandblacksmith that's actually a good trick, have you notice any difference with or without the water stone dust?
it is one of the three main ingredients (1:1:1 clay, charcoal, stone powder) so it is quite important in keeping the mixture from cracking as it dries...
@@islandblacksmith ooo.. I just learned something new, the blacksmiths I know usually added a lye compound to the clay. I'm still a novice when it comes to blacksmithing but something to experiment with in the future. The hamon process is a bit much for my wee forge.
keep at it, it doesn't take much! ua-cam.com/video/c5ht0P6hrZE/v-deo.html
Great vid, and updoot well-deserved. But what OP neglected to mention is that raw Urushi is the exact same chemical that causes Poison Ivy/Oak rashes.
Clearly, OP is not allergic, but if you are planning to use Urushi and you ARE allergic (or even if you don't know) then it's very important to wear latex/nylon gloves, AND long sleeves! It's extremely easy to develop a serious and persistent rash (like, for two weeks) from just the smallest drop/flake of this stuff!
Fortunately, once Urushi is fully cured, it becomes inert, and no longer causes rashes. So anyone can handle the finished product, no problem.
thanks for keeping folks informed and safe, a never ending and largely futile job these days! there is quite a range of responses from nothing at all to quite severe for 3 weeks, one factor that increases tolerance is how much cured urushi you have been exposed to in your life (eg. eating from urushi dishes and chopsticks), while working i rarely ever touch it (it is too valuable to drip around like paint) but i don't seem to be at all affected by it, as is the case with most urushi artisans i know of in japan...be wise but not fearful!
@@islandblacksmith happy to help! ..And I did not know it was possible to gain a tolerance to it - thank you, you've just taught me two things today!
Wow, it's a very interesting method to fix stones, need to do the same for some of my broken ones.
Btw, why didn't you fill that huge gap at the top with the stone dust mixed with urushi? Or the gap simply doesn't matter?
i thought about it, but it would take another few months to dry so i will just use it as is, for polishing it is fine...
wherewith can be glue? Urushi in Russia is not for sale
urushi is for sale online from watanabe syoten, but it might be possible to use some other glue, i have not tried...
@@islandblacksmith Thank you ! How do you dry urushi ?
just wait several months and it will cure...warm and humid environment helps speed it up though...
Is there any online stores that I can use to order these water stones
not this type, but you can get several types at namikawa heibei...
@@islandblacksmith thank you sir your work is nothing but pure inspiration to me
much appreciated!
A Chunagura. Don't you hate that. What's worse is when a Komonagura does that. I somehow had most of my Uchigumori split between layers, no problem there, just redress, maybe end up with Hazuya. Although sometimes these accidents can provide stone for Hi polishing.
I honestly don't know how I missed this channel until now. Someone who understands me.
I have to admit though, I did most of my work when I was younger. I never found an apprentice, my son had no interest, so I just stayed in the shadow. I'm not a Kaji though. I know much about Smithing from discussion and hours visiting a couple Forges through the years, simply never tried my hand at it. Kenjutsu, Iaijutsu, led me to Togishi. Not classically trained either, was under the tutelage of a Japanese Phd, Metallurgist who worked here in the States for Kenametal decades ago.
are you still polishing?
@@islandblacksmith Not currently. Unfortunately life happened too many times. I have a profession in Healthcare. In the early to mid 90s the economy crashed and everything changed. Less clients, smaller shows, etc. I took a full time position as evening shift supervisor at a busy local hospital to make ends meet. I used to work part time at another hospital and full-time polish, that changed to 7 day stretches at the hospital. It's a complicated messy story complete with wife that did dumb things, a divorce and a 3 yr old Son back then. Something that I would rather not discuss here. The MGTOW guys already know me too well.
I do miss the smells of the Stones and Steel, Incense, and Clove a hell of a lot.
indeed, even a few months away and the smell of a good stone is natsukashi for me...
You don't make many videos but when you do they are soo goood. Like beyond useful good.
glad they are helpful! there doesn't seem to be any information out there in english on this type of repair so i thought i'd put it up...
i wonder, if you had used a thick green wood base, would it have clamped the stone together as it dried?
would it have crushed the stone?
or would the stone have broken the wood base, because of lack of flexibility?
i like the performance of this stone.
seems to be of medium hardness and forming a decent slurry.
very relaxing video.
you are thinking wood would season faster than urushi cures (^____^) ...if done properly either urushi *or* wood base is enough on its own (depending on the type of break), i used both for this project...
yes, i think it could be possible, but wood shrinks more in one direction than the other and stone would win in a compression contest, so you would have to know your wood and dimensions well...but the bottom line is that stone has no "give" so if the base is cut accurately it is already perfectly clamped, especially when water is added...i have also seen wedged tenons for stone bases so they can be tightened if needed...
@@islandblacksmith oooh yes you are absolutely correct! the water used for sharpening, naturally would make the wood swell and press the stone together tighter.
is using urushi to glue broken sharpening stones a traditional method
or did you misplace the super glue? ;P
traditional...also when there are hard inclusions in a stone you v-chisel the vein out and fill/seal with urushi...and yes, i misplaced the super glue about a decade ago, permanently ^____^
@@islandblacksmith superglue can be quite handy tho, especially for small cuts at your finger tips.
i like how devoted you are to traditional techniques, id love to do the same one day
but still have much to learn,
eventually i think ill discard all electric tools and build/acquire hand or treadle powered tools.
human power=best power :D
yes, nothing inherently wrong with power tools, like hand tools they need to be chosen/used when they are the best choice for the work...and i enjoy working this way...
1:)
New vids!
What camera and lens you use for videos? And is it same for still photos?
yes, same for everything pretty much...olympus omd em5 and vintage 1980's m42 mount lenses from second hand shops...
Crossed Heart Forge - islandblacksmith thanks!
Yes! I just got my hands on some literature to try Japanese style blades. I have a question: can I use wood for the kurikata and koiguchi instead of buffalo horn?
i have done it with very cross-stable wood like ironwood, but there isn't a whole lot of historical precedent for it as koiguchi...antler or bone is another natural material with enough strength for kurikata, koiguchi can be reinforced with thin metal bands too...
@@islandblacksmith Ahh thank you! getting hold of the ray skin and buffalo horn will be tough
@@TurokroIV some older mountings used regular rawhide instead of ray skin, and there are other kinds of useful horn around, sometimes even second hand sculptures or souvenirs...
@@islandblacksmith Thank you! I can find cow horn more easily. Great info right there. I look forward to your uploads!
great, "blond horn" is a lovely accent and considered rare and valuable in the japanese knife world...