Prototyping Chef Knives

This was an interesting project. Interesting in the sense that nearly nothing went as planned.

First I started to make five blades and I broke one after hardening, so I have made it into a smaller knife for my neighbor. But what happened after that was a real bummer – the four remaining blades stubbornly resisted my attempts at tumbling. After over a month in the tumbler, none of them had the pretty, regular finish that I have gotten on my full-width tang blades. Maybe the point of balance of these blades, or their width, or both, have played a role. I simply do not know. I only know that after over a month I took it as “lesson learned, you cannot tumble these, finish them or toss them as they are”. And because they are prototypes whose main purpose was learning, I have decided to use them as they were.


The first piece went on a bed of flowers into a land far, far away. What happens there is in the stars and out of my hands.


The second piece I have finished with an experimental piece of wood – one of the very rotten willow pieces that I have stabilized with resin during my first tests. Only the piece was just a tad thinner than I needed, so the resulting handle is slimmer and straighter than I intended it to be. I am keeping this knife for myself. I just cut onions for dinner with it and it works reasonably well. Whether it works better or worse than other chef knives I cannot evaluate, since I do not use chef knives regularly.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The handle looks…. interesting, but not very kitchen-knifey. I have used dark brown dye for the resin on the assumption that it will give the wood the most natural look. And it did that. Only it gave the wood also a decidedly camo-tacticool look. I think it would be great for a bushcraft/camping knife, but on a kitchen knife, it looks a bit odd. But maybe infusing the wood with bright colored resin – yellow, red, green, or even blue – might lead to interesting results. I am definitively going to try that next time. The rotten log will not burn – yet.

I have made my first bolster from buffalo horn here and fitting that and the handle together with the curved spacer from bone went reasonably well right until the last step in the process. That last step was buffing up of the horn. I have used my DIY red hematite buffing compound because it worked well on the horn – it is less aggressive than industrial steel buffing compounds. But some of it got stuck in the pores in the bone and it is impossible to clean afterward. That is unfortunately a common problem with bone – it has nearly invisible pores that tend to pop-up at the very end of the work when the piece cannot be replaced. So working with bone is always a bit gamble and you often get some dark spots here and there. It is not plastic but a natural product after all. But these red spots look like someone bled all over it. Grrr.


The third piece got fitted with bubinga handle and bone bolster. It goes to my former colleague, who has been patiently waiting for it for nearly a year by now.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

Nothing went wrong with the knife itself. I have fitted the bone bolster with the handle really well, there are no gaps between the white bolster and the blade. Nothing to complain about except the large cut in my right thumb during assembly because the blade cut during all that wiggling through several layers of cloth and masking tape.

Bubinga is beautiful and very hard, but it is not a wood that I would normally use. It is not grown sustainably and the species, while not endangered yet, are on a way to becoming endangered. But since I got this piece for free with a shipment of steel, I have used it. I think I got it for free because it had a worm-hole, but luckily enough it got completely ground away during work. And the piece was big enough for me to make the handle in a shape and size that I have initially intended. It has a trapezoid-profile with rounded edges, for better grip and edge-alignment.


The fourth blade was fitted with a horn bolster and cherry crotch wood with a bone spacer. And this is the closest to my intended design of all three. It is now in the possession of my main tester – my mom.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The cherry wood is very beautiful, all the more pitty for the unseemly cracks. I will have to devise and use some kind of end-cap for cases like this when it would be a waste to toss the wood but there are some blemishes on the end grain. My mother does not mid it as it is and I hope it will serve well. Apart from these cracks, the only thing that went wrong was a cut in my left thumb – yup, I got symmetrical cuts with different knives.

Stats for all these knives: blade ~210 mm length, 3 mm thick, 50 mm wide, grip ~130 mm long. They are more forward-weighted than my full-width tang kitchen knives, so they would be probably very effective choppers too – the point of balance is right at the heel of the blade.

Hallowe’en Photo Festival of Fun and Fundraising

Today’s photo is of a ‘spider mat’ sent in by mrandmrsoccupant. This fabulous work of art was made in Eugene, Oregon during the mid-1960, when the artist was still in grade school. It’s been kept safe all these years by the artist’s mother, who recognized a masterpiece when she saw it.

Spider mat, mid 1960s, ©mrandmrsoccupant, all rights reserved

Marcus Gave Me Wood, Here Is What I Did With It

Marcus sent me a piece of stabilized maple burl last year. It wasn’t very big, not enough for my usual chunky knife handles, but it was big enough for two badger knives, so I used it for the last two blades in the current batch.

I did not do the brass bolsters and pommels very well, I am afraid. The pins refused to blend in – they do so so seamlessly in aluminum and stainless steel, but so far I did not have any luck with brass. And since this blade is stainless steel, some artificial extreme patina would not look proper. I tried to make the heads rounded this time, but I did not like the look of it at all, especially because I did not position them correctly for that kind of look. Nevertheless, the extremely beautiful wood from Marcus, when polished with beeswax, does redeem the knives a little. And when I saw how pretty the wood is, I have decided to make better and nicer sheaths for these knives too.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

This is the better of the pair. Making the silver maple leaves was real fun, and I have managed to get the colors very close to what I have originaly designed in Photoshop.

It looks pretty, but silver maple is not native here so for the second one I have used a different design and color palette – yellow small-leaved linden leafs.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The small-leaved linden tree is pretty common here and it is also Czech national tree, so I have been intentionally a bit patriotic with this one. Unfortunately, I run out of the medium thickness leather so I had to use the thicker one and it was just a tad too thick for this small knife design. It is not a functional problem, only the leather could not be formed so snugly around the knife, because the knife would not get out.

I think my leatherwork is improving and I like these leafs-designs. I shall definitively use them more, even though they are a bit labor-intensive, especially since I do not intend to use the same design twice. I might use the outline, but I will always at least mix up the colors differently.

Upcycling Old Jeans

During my first experiments with resin stabilized wood, I had a lot of dark brown leftover resin at the end of it. So I have decided to do a little experiment.

I took some old black jeans, cut them into squares of approximately the sizee of a hand palm, soaked the pieces in the resin, stacked them in a receptacle and I poured all the remaining resin all over them. I have tried my best to chase and push manually all the bubles out and let it harden.

The resulting material has an official name – micarta – and the results look quite well, I think.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The pieces were not too big, but big enough for four small scales for two of the badger knives that I had in production, so I have used them straightaway. The material works well, it is sufficiently hard to take decent polish, but not so hard as to be difficult to work with. It does heat up a bit and clogs up sanding belts, but reducing the belt speed and using only fresh belts did away with that problem.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

That the layers are not perfectly perpendicular and flat adds a bit more character to the material, which I like. I think it is a good way to use excess resin and these knives should now be extremely resistant to elements – the blades and fittings are all stainless steel, the handle scales are micarta and the sheaths are leather infused with beeswax. They would probably survive for a non-trivial duration in fog and rain outdoors. Not that I would do that to them.

I am also pleased that now that these knives are significantly less work than the bowie-type small hunting knivest that I was presenting previously. The goal is to have a mix of cheap(ish) and expensive items on offer in the future, I do not wish to only make luxury items that take weeks to months finish each, neither do I wish to destroy my enjoyment of the craft by bogging myself down in repetitive tasks o making the same thing over and over again.

Hallowe’en Photo Festival of Fun and Fundraising

It’s October, which means that means that Hallowe’en is just around the corner.  The bloggers here at Freethought Blogs will be hosting a Hallowe’en Fun and Fundraising event to show off our talents, including fall photography, and you’re invited to play along. There will be other events happening on Hallowe’en Day so stay tuned to hear about those, but the Photo Festival starts now, so you’ll want to tune in often to see what our fellow bloggers are doing with their cameras.  I’m pretty sure there will be spiders, but who knows what else could turn up. But wait, we want to see your photos, too. All of the photos will be posted under the title above, so they’ll be easy to find.

PHOTO submissions should be sent to affintysubmissions@gmail. com (the address is always in the left sidebar under the percolating head, and the link there will open up an email form for you). If you’re able and so inclined, you can donate to the cause at our PayPal at FtB Defense Fund.

As soon as we have the schedule for the Hallowe’en Day event, I’ll point you to it, but for now, why not pick up your camera and go outside and see what you can find. They don’t have to be current photos. You can search through your stash, too, but fall is a gorgeous time of year, so why not get outside while you can. It won’t be long until Winter arrives, dragging Covid with it, which means a lot of isolated indooring. Ugh. Don’t waste this opportunity to get out for a walk before that happens.

Today, the Photo Festival of Fun starts with a submission from our regular reader, Avalus, who has sent in a deadly dragonfly to start things off. It looks to me as if this guy is camouflaging while waiting for an unsuspecting fruit-eating bug to happen by, so he can gobble them up. Wham! Avalus then tortured the berries by making them into jam, so this harmless-looking photo is anything but.

Dragonfly with Blackberries  © Avalus, all rights reserved.

 

Finally I got Something Done

The original plan was to make ordinary knives, no fancy stuff, no distractions, just to build up some stock for sale when the bureaucracy here finally gets its act together. But I did not stick to that plan too well. First I got distracted several times making new tools, then two knives came out so nice that I thought it a shame to not make sheaths for them that are just a little fancy. But after two months, I have finally finished four pieces.

Today I was trying to take pictures, with very varying success. For reasons that I do not understand, I get usually the best results with reddish/magenta cloth background.

Here are the four knives, details, and some talk about each piece are below the fold.

© Charly, all rights reserved. Click for full size.

[Read more…]

My Little (Stitching) Pony

Since sewing leather sheaths whilst holding them between one’s knees is a huge pain in all kinds of regions, I have decided to bite the bullet and build myself a small stitching pony. It is very simple, but, as usual, it took me way more time to make than it should have. Here it is for you to admire.

© Charly, all rights reserved. Click for full size.

It is made from reclaimed firewood, so I have spent a lot of time sanding of splinters.  The “H” formed base is for stability, but the two planks are only fixed with one screw each and tightened only with a winged nut. That way I can loosen them, and fold them so the pony can be put out of the way and leaned against a wall when not in use, together with other useless junk I posess, like painter’s easel.

You can also see that I have bought a suitcase for my leatherworking tools. It is already full to the brim and I have barely begun :(.

© Charly, all rights reserved. Click for full size.

Jaws are covered with leather, here it is not fully trimmed yet. You can admire the high precisisn’t with which I am usually assembling these tools.

The right jaw is fixed, the left jaw swivels on a hinge. They are tightened via one long screw with a winged nut. The screw is deliberately very loose, so it cannot be overtightened.

© Charly, all rights reserved. Click for full size.

A piece of wedge-shaped hardwood with slits slides on two screws and under the winged nut, allowing for a sort of easy quick-tighten and -release tool.

It works as it should. Like all tools, it gets some getting used to, but it does make the leather stitching several orders of magnitude easier. I have tested it today and I was definitively a lot quicker. And my back hurt less.

Expect some leatherwork in future too. Hopefully.

I Was Like a Fox in the Henhouse…

Today I took a day off of any duties and works and I went for a walk in the forest, with my camera. And right at the edge of the forest, I got distracted.

© Charly, all rights reserved. Click for full size.

I had planned a long picture-taking walk, about five-six kilometers. I had drink and snacks packed, an audiobook prepared, and just in case I find some mushrooms, I had two cloth shopping bags in my backpack. I thought maybe I find enough for a dinner.

© Charly, all rights reserved. Click for full size.

Boletes are growing in huge numbers. I did not even get to the best places and I filled both shopping bags before venturing so much as twenty-thirty meters into the forest. They weighed about five kilos each, here you can see them after I took a hefty portion off the top to give to my neighbor, who likes them, but, like my parents, is too old to go collecting herself.

© Charly, all rights reserved. Click for full size.

My tiny kitchen counter was covered in mushrooms. It took me about six hours to clean all these and cut them. Most were cut to slices to dry, but some were too soft and spongy (and there were some blushers in there too) and had to be cooked right away.  And even though there was a lot of waste, I still filled the whole vegetable dryer and a table with drying, and my biggest pot with cooking. There are good ten-twenty meals in the pot, so after it all cools down, they will be divided and packed into small portions and frozen.

I must apologize, I did not make any pretty pictures for you today. But I am really tired, despite my walk being only about one-fifth of the length I planned.

Card Weaving

kestrel is graciously sharing her woven artwork with us, and she’s taken the time to teach us about how this type of weaving is done. I’m sure you’ll agree that it’s fascinating.

 

Card weaving (or tablet weaving as it’s also called) is a very ancient craft going back quite a ways. A very wonderful find was the Oseberg ship with two women buried in it. Among the many textiles found, there was also a loom with the warp still attached to the weaving cards. However historians believe card weaving is much older than this 9th century find. Card weaving was a technique people used to create very strong and sturdy as well as ornamental bands. Some of the very ornamental bands seen in religious textiles were created this way. 

 

Although I used to weave quite a lot, for whatever reason, I had never tried card weaving. I’d had to give up weaving (there was no room for my very large loom and I had to sell it) but recently I decided I wanted to weave again. My big loom was gone, but you don’t need much to do card weaving. 

©kestrel, all rights reserved

[Read more…]

Punch and Die (and Fun)

I do not have the genius of Leonard da Quirm, but I do share one trait with him – I get easily distracted and sometimes spend several days trying to shave off a few minutes of some task or save a few bucks. Sometimes the effort definitively pays off – as in the case of my belt grinder or my forge burner, sometimes it is a success but with a question mark whether it was worth it – like the unbender (now I know it was worth it, btw, I have used it several times already and it is time-saver), and sometimes it is a bit of a flop, as when building a vacuum pump. If I had a definitive fail, I do not remember it, and so I allowed myself to get distracted again these last two days.

I have a problem with making metal bolsters, handguards, end-caps, and pommels. As in, it is difficult to get material thick enough to make them pretty, and even if it were not difficult, the result would be overtly heavy and thus would put the knife balance totally out of whack. The proper way to make bolsters and end caps is to make them hollow, and there are techniques for that. One of them is forging – as I did in the rondel dagger project. But that is labor-intensive, has poor reproducibility, and requires special tools anyway. Or I could buy prefabricates and adjust my design(s) to fit what is already on the market. Screw that!

So I have decided to make some new tools, and test them. The inspiration was a technique of minting coins before the invention of fly screw-press, which I have seen as a child in some black and white movie which has shown the making of Prague groschen at Kutná Hora. I remember nothing else about the movie except the part where they strike a punch on a silver blank with a hammer and thus make a coin. I think there was some drama and history in there too…

First I have made a die out of 5 mm high-carbon tooling steel. It consists simply of two holes – one for the bolster and one for the end-cap  (I have chosen my small hunting knife as a pilot project because I think the design will be improved a lot by it and because I do plan to make more of these knives in the future). Second I have ground two punches out of square stock of high carbon tooling steel that I have scrounged at my previous job. Grinding the forms with angle grinder was not easy, but it was not insurmountably difficult either. I had actually a lot more trouble with welding onto it the 15 mm round stock for holding the punch in place and for striking – my welding sucks, bigly. And because at least the first strike needs to be real mighty, I have built a small wooden stand to hold the punch in place for that.

© Charly, all rights reserved. Click for full size.

With the assembly on the concrete floor, as you see it in the photo, I have given it a mighty whack with my puny Mjolnir. And I rejoiced because it was a success. To protect the floor from damage I have put it on a steel plate for subsequent tries and I went and punched four sets for the four blades that I have currently in making, three out of brass and one out of pakfong.

© Charly, all rights reserved. Click for full size.

The pakfong was a bit thicker than the brass so it gave me some grief, thus the surface is not so smooth on the end-cap – I had to whack it several times and it wandered off the die and I struck it without noticing it. But that should not be a problem, there is enough material in there to polish these dents out.

It took me mere minutes to punch all these, and after a long time, I was really, really happy for a bit. There are a few details to iron out – like making a better stand for the punch, making it so I can put it safely on my anvil, figuring out the ideal amount of overhang and so forth – but it functions as it is and it is a massive saving in time already. Whether the knives will really look better remains to be seen, but I am confident they will. Further, this opens a lot of new possibilities for knife designs for me.

I Probably Won’t Do This Again…

After a month of work, I am finally at a phase where I have something to show for it. The kitchen knives are in the tumbler for the second day now, tomorrow I shall check if they are ready or not. But it need not hurry, I have enough to work with – eight fully polished blades.

© Charly, all rights reserved. Click for full size.

Today I have etched the logos and numbers on these because it is easier to do on a naked blade than on a finished knife. Now I can finally work on finishing at least some of these into final products while the kitchen knives tumble.

Working in bulk does save significant time and even resources, but 18 blades in one go was a bit too much. I am going to reduce the batches to 8-12 in size. That way it should keep its savings, but the polishing hell will not be that long. Polishing is extremely onerous and unrewarding work because one keeps doing the same thing day after day, working through the row of belts with very slow progress. With one knife, it is one-two days of a boring slog. With eighteen knives, it was three weeks – and one of them got broke and nine only to 120 grit before going into the tumbler, if not for that, it would be even longer.

These are not perfect, some of them have serious problems regarding symmetry, although only in one case it is visible with the naked eye. On all of them is it visible with calipers. I am starting to doubt that I will ever do a good job, but there are some signs of progress. One of those signs has, unfortunately, a bit of a negative consequence on these blades, all 17 of them – they are a bit thicker than I expected (a few tenths of a mm). That is because I have gotten a bit better at working on the belt grinder and thus I did not grind away as much material as I used to by having to correct mistakes

Mind you, they all will cut perfectly fine even so, and some of them already do despite not being sharpened yet. But a thinner blade will always cut better. On the other hand, these should be extremely sturdy and should be able to withstand even some serious abuse, and that is a plus for a hunting knife. We will see if there will be people willing to pay for these without bashing me over the head afterward.

Now to think about how to dress-up these blades and the accompanying sheaths. I think I have quite a few more weeks of work ahead of me, but now it should be creative work, and therefore much more fun.

This Was Not Supposed to Happen – Quality Control and Salvage

The last batch of knives did come out of quench straight-ish, but the tangs were a bit crooked on some blades. No biggie, he said. Those are not hardened, he said. Will be corrected in a jiffy, he said. And then he broke a blade in half because he was an idiot.

© Charly, all rights reserved. Click for full size

Still, I do not think the blade should have broken like this, it is tempered and I did not exert too much force. But maybe I did. Unfortunately, the tangs did partially harden on some blades, which is a major headache because I have to heat them up significantly in order to straighten them now. As my hardening experiment has shown, with this steel all that is supposed to be soft must not be heated above the 1050°C at any point in the process. Which, admittedly, I did not know for sure at the time of quenching these blades.

So what to do with this? I have spent nearly eighteen years being involved in quality control in one way or another, and I must say it is a great way to make enemies at all levels. Customers hate you for the crap your colleagues have produced, your colleagues hate you because you point out to them that they have produced crap and the management hates you because you cost them money (both when things go well as well when things go awry) without generating any profit whatsoever. And everybody expects you to tell them how they should solve the problems you found – despite that part being actually their job, with yours only being the pointing out of the problems.

Now I am my own quality control so at least now it really is my job to solve the occurring problems. For example, apart from this broken blade, one blade seemed to be softer near the tang. I have decided to continue work on it anyway and I established later on that it was only slight decarburization and the steel is sufficiently hard deeper under the surface. So far so good. But is there anything that can be done with this broken blade? Well, I surmised that yes, and I have decided to try some new things whilst doing it.

© Charly, all rights reserved. Click for full size

The broken-off tip was long enough for me to grind small (9 cm) blade out of it with enough steel left for a short hidden tang. I have simply cut it with an angle grinder to the desired shape and then thinned, formed, and polished the blade on the belt grinder. The notches on the tang are there to allow for the epoxy to grab onto.

© Charly, all rights reserved. Click for full size

I have made the handle from a piece of apple-root from a dead tree given to me by my neighbor. The bolster is from a coconut shell. The wood was partially rotten, so I have decided to try my hand at a new thing – stabilizing the wood with epoxy resin. And to utilize my resources meaningfully on this experiment, I went and cut some more wood, even more rotten, from a willow trunk that lay in the garden for years. It is full of holes, wood dust (AKA grub poop), fungal discolorations and it is extremely porous, it even crumbles in parts.

© Charly, all rights reserved. Click for full size

I do not have a compressor or a proper vacuum pump, and I was unwilling to spend any money on them at this stage, the resin itself was pricey enough. So I tried my best with things I already have at hand and I came up with this.

© Charly, all rights reserved. Click for full size

These are two huge thick-walled glass jars for canned fruit, with removable snap-on covers. They should withstand vacuum reasonably well. I have replaced the glass-covers with ones made from particleboard, with the joint and snap-on latch made from fencing wire around some screws.

The jar on the left has a ball-valve in the middle, with 6 mm tubing attached to it. The jar on the right has two 35 mm holes and one 6 mm hole in the middle. To the middle hole is attached the thin tube from the left jar, shop-vac is connected to one of the big holes and a swiveling cover is over the second hole.

I have given the knife with handle suspended in resin in the left jar. When the shop-vac was running with the ball-valve open and the big hole covered, it sucked air reasonably well out of both jars. But shop-vac cannot run with blocked intake for too long, thus the ball valve and the covered hole – after half a minute I could close the valve (keeping the low pressure for a few moments more), opened the big hole and left the shop-vac cool with flowing air for a minute or two. Then I have repeated this process as many times as it took until no bubbles were rising from the resin.

To get an estimate, I weighed the knife before and after, and it has gained about 20 g of weight (65 to 85 g), which seems reasonable, the wood was not extremely rotten, only slightly so. I have also weighed one of the willow pieces and the weight gain there was much more extreme – from ca 20g to 120 g. I have not cut the wood to see how deep the resin has penetrated, but it definitively penetrated deep enough to work on pre-formed handles, even if not on squared wood.

So this has confirmed that I can do this with the equipment I already have and that investing in some better equipment is thus warranted. Still, I am hesitant about spending 100,-€ or more on a vacuum pump, I hope I can mc-gyver something a lot cheaper. On Wednesday I am going shopping for parts. If I succeed, I will let you know.

Oh, and here is the finished knife.

© Charly, all rights reserved. Click for full size

Overall length 20 cm, blade length 9 cm at the spine, 3,5 cm wide, satin finish (trizact A100). The handle was polished to 1200 grit and buffed with beeswax.

I have given the knife to my neighbor because she has refused payment for the dead tree and I think she should get something for such beautiful wood. She did not object this time and I hope it will serve her well.