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Making a SHARP Aluminum bronze Kiridashi Knife 

Robinson Foundry
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In this video I will be showing you how I made Japanese Kiridashi style knives out of aluminum bronze. These knives were made using the lost foam casting method. Thin Styrofoam was cut on a laser cutter and then a sand mold was made. Aluminum and copper were mixed together in a crucible to make aluminum bronze and then poured into the sand mold.
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26 янв 2023

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Комментарии : 171   
@mathewritchie
@mathewritchie Год назад
Not sure about aluminium bronze but most copper alloys tend to work harden so hammer peening the edges should give better edge retention.
@bethelgues3918
@bethelgues3918 Год назад
Aluminum bronze is actually very susceptible to work hardening which is why it is often cast and not milled/machined.
@abryant5258
@abryant5258 Год назад
I'd love to hear more technical details and comparisons to stainless steel. This is one of those alloys you don't hear a lot about, but it's impressive when you are first introduced to it
@frigginpos
@frigginpos Год назад
The knives were beautiful, but not the right material for a hardened edge. Nice video, and thank you.
@H0mework
@H0mework Год назад
There's many alloys of stainless, as well as this composition. This is commonly used in coins and as an iPhone "gold" color.
@Boosted98gsx
@Boosted98gsx Год назад
Stainless will always be harder than Al Br, but stainless being a more complex alloy has other issues. Al Br will be far more lubrous to machine than stainless, and won't burn up your inserts / endmills in case you need to do any post process machining. SS has a habit of cold working and burning up carbides, even in flood coolant. Stainless can't really be cast without an inert atmosphere either. Otherwise O2 will burn out the alloying elements, and then you have to deal with hexavalent chromium as well.
@Hannah_The_Heretic
@Hannah_The_Heretic Год назад
Ive never even heard of aluminium bronze before, thanks for the video!
@alwayscensored6871
@alwayscensored6871 Год назад
Oz n Kiwi $1, $2 coins are made from it. But I am not melting down $300 of coins for a blade, haha.
@ethanhumphrey5758
@ethanhumphrey5758 Год назад
@@alwayscensored6871 Plus it is illegal to deface Australian coins
@SmokeyJoe42098
@SmokeyJoe42098 Год назад
@@ethanhumphrey5758 same in the USA except for in a project like this - money can’t be defaced for intention of defrauding someone, or increasing the face value. I don’t know if Australia is the same but in the US we can make art with coins (hence the penny press novelty machines)
@howardosborne8647
@howardosborne8647 Год назад
It is quite commonly used in marine applications for shafts and heavy duty sleeve bushings. It is surprisingly robust considering how soft the parent metals of the alloy are.
@ethanhumphrey5758
@ethanhumphrey5758 Год назад
@@SmokeyJoe42098 Australia is different- technically you are breaking the law if you melt a coin.
@Charlielizard
@Charlielizard Год назад
Those blades turned out fantastic. Casting foam worked out great. Especially with the pattern. Looking forward to watching more videos with other alloys. Still amazed at how the edge held up to the cardboard. 👍🏻👍🏻👍🏻
@quincyfellows2636
@quincyfellows2636 4 месяца назад
Made a bronze dagger like this is RuneScape or something lol. Great vid
@jeanladoire4141
@jeanladoire4141 Год назад
hey, french blacksmith here ! I have a bit of experience in forging aluminum bronze. It can make surprisingly decent blades if worked properly. Know that you can actually QUENCH and TEMPER aluminum bronze, just like steel ! Aluminum bronzes with 15% Al can actually have a hardness of 40 Rockwell, wich is just huge for a copper based alloy (and multiple times harder than structural steel, stainless steel, or even poorly hardened carbon steels). That being said aluminum bronze has some restrictions, and forging it is very hard for a beginner. But if you make researches about it, you will find surprising results. If you make your alloy yourself, keep iron and nickel on hand for grain growth stabilization and toughener, and check the most common recipes (like CuAl15Fe5Ni5)
@autumn5592
@autumn5592 Год назад
Not saying I don't believe you, but could you provide a source or some info on that? I'm just an intrested knife maker. 40 Rockwell seems pretty crazy for a copper alloy, seems like it could be cool to tinker with.
@jeanladoire4141
@jeanladoire4141 Год назад
@@autumn5592 check out CuAl15Fe5 alloys, they are pretty uncommon, but they are used to make litteral stamps in machines, like they cut sheets of steel and titanium with that. If you're really interested i have pdf engineering pdf documents about the martensite structures in cupro aluminum alloys, But if you want the very hardest bronze, wich is at 50 rockwellC of hardness after quench, you can look for CuBe2 (copper and 2%beryllium)
@johnjude2685
@johnjude2685 Год назад
That shape is good to mark lines on wood
@BR5494
@BR5494 Год назад
Job.well.done.awsome.looking. Knifes.BRAVO 🏴‍☠️🇺🇲😃
@andywolf3205
@andywolf3205 Год назад
Penny- Super. Good work. :)
@bomas2578
@bomas2578 Год назад
Awesome knife skills and all but the best part is the dog.
@walter2990
@walter2990 Год назад
Although I'm not a Knife Smith, I have a great friend who is..., my personal hobby is melting metal. I'm going to cast my buddy, several of this type of blanks for his hobby. I'll try to cast some larger blades using your method. It'll be a little surprise for him. Thank you!
@MoneyCrespin
@MoneyCrespin 5 месяцев назад
I totally want one!
@Vault57
@Vault57 Год назад
Nice concept for EDC if someone worked in an area where nonsparking tools were required.
@freemanmetalworks1698
@freemanmetalworks1698 Год назад
I love that hammered look.
@dangerousandy
@dangerousandy Год назад
Nice job on those. Penny is adorable 😍
@Rias-Gremory-a-gamer
@Rias-Gremory-a-gamer Год назад
A suggestion next time you drill threw metal it be a good idea you use cutting oil give you a nice drill cut and cleaner one.
@omidram5889
@omidram5889 Год назад
Hey great to see using belt grinder. I’ve to mention that you should point your knife downwards and grind the spine otherwise the point might get caught into belt and shoot the whole piece toward you! Stay safe 4:55
@ethansoliga4045
@ethansoliga4045 Год назад
Hello Penny 👋. 🐶👍
@earlt612
@earlt612 Год назад
He's back
@thunderbasilisk1352
@thunderbasilisk1352 Год назад
These knives look amazing!
@AndiNewtonian
@AndiNewtonian Год назад
Very cool! I love the design, and the way the sharpened edge blends into it.
@carrestore
@carrestore Год назад
Nice work 👍
@rachelg552353
@rachelg552353 Год назад
It’s always so exciting when you open up the molds!! Look great!!
@UniverseUA
@UniverseUA Год назад
Awesome video, can you try and make manganese bronze?
@BakeBakePi
@BakeBakePi 8 месяцев назад
The blade looks so cool! Great video!
@BUZZKILLJRJR
@BUZZKILLJRJR 8 месяцев назад
I love it! I made lost wax molds when I was in high school but this is very cool never heard of lost foam till now it's awesome!
@Serbianguy432
@Serbianguy432 Год назад
The knives came out great. Your fusion of ancient techniques with modern technology always provides for a video that entertains and educates. Keep up the good work, your videos are a joy to behold.
@TheJCJexe
@TheJCJexe Год назад
Awesome! Would make a nice box opener.
@coupdegenie51
@coupdegenie51 Год назад
thanks again for this new video, sharing your knowledge and experience and very inspiring.
@G.A.N.
@G.A.N. Год назад
That is very nice and simple, it begs for having more like this, yet it seems quite uncommon
@kevinwatson5833
@kevinwatson5833 Год назад
Something to try beat the blade edge before grinding to work harden out of the mold ALBronze is in a soft state
@jimmy_valin5186
@jimmy_valin5186 Год назад
I always get so excited when you post a new video!
@BigBaHemith
@BigBaHemith Год назад
I still prefer when he does the lost pla methods
@jerrodbroholm4338
@jerrodbroholm4338 Год назад
Great video, as always. That casting was incredibly nice.
@CKILBY-zu7fq
@CKILBY-zu7fq Год назад
Nice build brother,
@jbprospector3638
@jbprospector3638 Год назад
Those can out awesome. Love the texture. 👍
@howardosborne8647
@howardosborne8647 Год назад
I like the design of these. They turned out spectacularly good.
@williaty
@williaty Год назад
Can you do a video about the modifications to your belt grinder?
@stuffbywoody5497
@stuffbywoody5497 Год назад
What I'd like to know is how the edge would hold up against leather. I do a mix of different old school arts like blacksmithing, wood working, leather work and several others. I use these mixed skills to make tools and a large variety of other useful items and some ornamental/aesthetic goods as well. I have been contemplating adding some smelting into the mix as well to broaden the skill set and add a bit more variety to the outcome of the items I make. So, yeah, how would the edge hold up to leather as a cutting or bevelling tool?
@wantafastz28
@wantafastz28 Год назад
Looks great
@drstrangefart
@drstrangefart Год назад
MAN THOSE CAME OUT BEAUTIFUL. I love a good kiridashi as a general purpose small carry knife. I made myself one out of the first damascus steel billet I made.
@justsluiceit
@justsluiceit Год назад
Great job Robinson !! Just Sluice It !!
@ajhproductions2347
@ajhproductions2347 Год назад
I didn’t know Aluminum Bronze was a thing until finding this video
@adamtwelve
@adamtwelve Год назад
I think you're still supposed to work harden aluminum bronze just like other bronzes, would make the edge last longer.
@bbrachman
@bbrachman Год назад
Similar to how we did 'lost wax' casting a long time ago. I am wondering if cast metal has to be quenched and tempered like other knife metals.
@Smallathe
@Smallathe Год назад
Very cool project!!!
@my1956effie
@my1956effie Год назад
They look great. 👍👍
@Kenny.6807
@Kenny.6807 Год назад
Nice one 👍
@dougdoggerson9353
@dougdoggerson9353 Год назад
Cute dog !!!
@maneotis4g63t
@maneotis4g63t Год назад
Those are dope
@judechandler5102
@judechandler5102 Год назад
Beautiful
@MrRowskey
@MrRowskey Год назад
Amazing
@josefmildner7665
@josefmildner7665 Год назад
Awesome video, I need one of those knifes. Congratulations 🎉 by the way. Great video, welcome back.
@capatainnemo
@capatainnemo Год назад
they will be ok as marking knives
@rolo1632
@rolo1632 Год назад
Love your videos man keep it up! 🔥
@KingKhiGaming
@KingKhiGaming Год назад
We need people like him in a apocalypse situation's
@PlagueOfFear
@PlagueOfFear Год назад
Nice!
@vince8723
@vince8723 Год назад
nice. love the look. what is the hardness of it i wounder.
@richerworldproductions
@richerworldproductions Год назад
This Aluminum Bronze sounds perfect for my application! How do you figure out the ratio of copper and aluminum? is it by weight, or volume?
@acmarston
@acmarston 9 месяцев назад
Would also be interested to know this.
@vidznstuff1
@vidznstuff1 6 месяцев назад
Weight
@FearsomeWarrior
@FearsomeWarrior Год назад
Recommend making a edge profiling jig for belt sander. I had made one and still managed to have a blade fly out of my fingers while free-handing to touch up the last spot on a blade.
@toomsx
@toomsx 10 месяцев назад
Nice 👍
@bradmyst1339
@bradmyst1339 Год назад
I think that you have heard of this but if you work harden (hammer the edges) your edges you get a stronger edge.
@jasonlabrecque8852
@jasonlabrecque8852 Год назад
Hello Mr. Robinson, I have been casting some alluminum bronze parts for a little bit (10% Al tends to also be my go to). I had watched your previous blade video as well, and was wondering if there is a specific reason why you decided not to work harden the blade your second time around? Is the difference in edge retention noticeable?
@jeanladoire4141
@jeanladoire4141 Год назад
aluminum bronzes can be water quenched, just like steel. they start reacting to water quenching starting at 9% aluminum, and their hardness after quench increases up until 15% aluminum where it starts becoming too hard and brittle to make anything with. I recommend you try making a bronze with some iron and nickel sprinkled into the mix to toughen it and make its martensite structure finer and tougher. Water quenched aluminum bronze (followed with a temper) don't require hammering for hardening !
@idk83153
@idk83153 Год назад
make a bolt that, in order to open/close, you need to go up, then down, then up, then down again and going like that
@shabananaeem1917
@shabananaeem1917 Год назад
Nice 👍👍
@XG916
@XG916 9 месяцев назад
You should start making and selling fishing lures and firearm tool kits! I see big time opportunity
@sirfer6969
@sirfer6969 Год назад
Nice work as always...Alu bronze is what a lot of "gold" coins are made of these days, it's strong stuff
@larrysimmons6082
@larrysimmons6082 Год назад
Where did u get the belt grinder.?
@GoderikCristobal
@GoderikCristobal Год назад
Hey man, this was amazing work! Do you mind telling me where you got that fancy hand crank siv? I'd really like to get one of my hands on that.
@sleepib
@sleepib Год назад
Might benefit from work hardening the edge before sharpening it.
@TheJedihunter
@TheJedihunter 9 месяцев назад
From what i understand with my years of cooking you should try to run your blade the same way on the steel going opposite directions will have the sides of you edge miss matched more like a micro bread knife
@CoalCoalJames
@CoalCoalJames Год назад
You probably already know this, but you can possibly cold temper (work hardern)the blade to get it even sharper... from what I've seen a little effort gets great results for softer metals.
@autumn5592
@autumn5592 Год назад
Tempering and work hardening are 2 totally different things.
@wolfd89
@wolfd89 Год назад
Love the minimalist design coupled with the dimples. It looks like a ball pin hammered copper sheet. Maybe invest in a dedicated grinder angle jig. Most other RU-vidrs who make knives have these to get a perfectly consistent angle on both sides.
@GermanDarioCarte
@GermanDarioCarte Год назад
Excelente
@xenoz666
@xenoz666 Год назад
Would this alloy work to melt copper hammers into new hammers, increasing the durability but still notnallow for sparks when hitting steel? Got around 20kg of copperhammers that are in bad share and going to make new ones.
@dominicmurar8427
@dominicmurar8427 Год назад
May be a dumb question but what do you do if you notice some loose/ not compacted sand after you put your mold in or does this never happen
@I.no.ah.guy57
@I.no.ah.guy57 8 месяцев назад
I want one lol Would those be able to be hardened?
@congoballs9725
@congoballs9725 8 месяцев назад
you should also add some nickel makes it more gold has more of a shine to it
@Hakan-mz6pd
@Hakan-mz6pd 5 месяцев назад
looks great, but a Kiridashi is only one edge ground, it is so you have a flat side for marking, it is a wood working knife after all
@maneotis4g63t
@maneotis4g63t Год назад
Can you work harden this Bronze?
@SmokeyJoe42098
@SmokeyJoe42098 Год назад
Yes you can, and you can heat & water quench them and rework them unlike steel alloys!
@ThompsonJustin1
@ThompsonJustin1 7 месяцев назад
Is the 90/10 ratio of copper to aluminum done by weight or volume? Aluminum weighs much less than copper
@Sam-gf1eb
@Sam-gf1eb 11 месяцев назад
I have a question. Why do you make the bevel by sanding? Wouldn't it be smarter just to have the model being casted already have a bevel? You can also do the bevel most of the way but not fully if you want to sand it. It will save time. What's the point of using bronze into a mold if you can use the same exact method to make it out of steel?
@carlosschagun6922
@carlosschagun6922 Год назад
The next time you make a blade or cutting tool try with Beryllium Copper.- It is very strong and hard...
@projectdirtbikes
@projectdirtbikes Год назад
Man those things are sick! What breed is Penny?
@aboodabood116
@aboodabood116 11 месяцев назад
Is it safe to use with food
@seanfoltz7645
@seanfoltz7645 Год назад
90 copper/10 aluminum is pretty close to Nordic gold, which is 89 copper, 5 aluminum, 5 zinc and 1 tin - would you be willing to recast those blades using Nordic gold to compare sharpness and hardness - maybe do some forged in fire style tests?
@littlehills739
@littlehills739 Год назад
Kiridashi was spoused to be chisel point to make next to ur rule right?
@autumn5592
@autumn5592 Год назад
Yes, traditionally Kiridashi are chisel grinds/single bevel. They can be double bevel (ground on both sides meeting in the middle of the blade.) The problem is he introduced secondary bevel this will mean marking lines are slightly off, it should have been a zero/scandi grind. I don't think it will matter much in the way of actual usability though, and the microbevel will introduce some edge stability (reducing bending/dents.)
@22scams32
@22scams32 Год назад
Ballin Turkish Cymbal Lookin Knife
@streetguru9350
@streetguru9350 Год назад
Main benefit is probably that they aren't magnetic. Might be an interesting alloy for bullets though too. Or maybe even just the casing for higher pressure ammo like the new 6.8mm rifles, you should try to make some to send off to the firearms channels.
@user-iq2uw5ow4j
@user-iq2uw5ow4j Год назад
Weapon manufacturers have long tested all alloys. And this alloy is not a surprise for them.
@ascendintegratedtrainingch1784
@ascendintegratedtrainingch1784 9 месяцев назад
Do you do commissions?
@BCM1959
@BCM1959 Год назад
They are pretty and semi-functional but more of a novelty than anything. Given the choice a steel knife wins every time. Try making one with a carbon steel piece for the edge?
@markwilson8632
@markwilson8632 Год назад
It’s more about the casting and making a very strong knife, not forging.
@BCM1959
@BCM1959 Год назад
@@markwilson8632 I'm kinda slow sometimes... Historically speaking you are a master craftsman. In today's terms that holds true.
@aries502
@aries502 Год назад
woop
@marcg2233
@marcg2233 Год назад
awesome video, just an Idea as a marketer, please look up "Naruto kunai" and make a pair with this style, you will hit a whole new demographic and this should help the chanel
@haljitw2348
@haljitw2348 Год назад
I'm not sure you did this, anyway Google said that al-bronze can be quenched to strengthen it.
@aaronh.7672
@aaronh.7672 Год назад
Is it still possible to heat treat those blades or is that kinda pointless
@look4lec
@look4lec Год назад
What do you think the total time was on these?
@alwayscensored6871
@alwayscensored6871 Год назад
I wonder if Titanium, Copper would work?
@davidgillies620
@davidgillies620 Год назад
Titanium copper (usually something like 97% Cu 3% Ti) is strong but far too soft to make a knife.
@alwayscensored6871
@alwayscensored6871 Год назад
@@davidgillies620 Gold, Platinum alloys can be very hard too. Bronze is Copper/Tin. Brass is Copper/Zinc. Alloys can have extra like silicon etc.
@davidgillies620
@davidgillies620 Год назад
@@alwayscensored6871 There's hard, and then there's the 55-60 RHC hardness you need to make a knife blade that will take and keep an edge. Steel is still usually the best choice. It's the carbides (iron carbide in the main, but also incredibly hard materials from the alloying agents like vanadium carbide and molybdenum carbide).
@alwayscensored6871
@alwayscensored6871 Год назад
@@davidgillies620 They keep saying the Eygptians only had copper tools. They ignore the Tin trade that even got Tin from South America. Some Bronze alloys are as hard as steel. Iron is soft compared to them. Material science are just now using AI to predict properties of metals of three or more elements. New or old formulations will be made. I am old enough to remember the first of the new Damascus blades, they said it would never be done, till it was.
@Nicknamed030
@Nicknamed030 Год назад
These knives look great but i feel like the knife would slip in your hand after alot of hard cutting like cardboard. Seems kinda dangerous without a wooden handle to give grip
@user-iq2uw5ow4j
@user-iq2uw5ow4j Год назад
What aluminum alloy did you add to the copper?
@vidznstuff1
@vidznstuff1 6 месяцев назад
Pure aluminum, not alloy
@DarkSeraph351
@DarkSeraph351 Год назад
Those are really cool-looking but traditionally a kiridashi is a single-bevel.
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