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Jeroen Zuiderwijk

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Jeroen Zuiderwijk last won the day on September 16

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About Jeroen Zuiderwijk

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    Bronze age, iron age, early medieval.

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  1. I see them a lot on facebook, but I've never seen the advantage of them. I forge in the bevels, then use the file to clean them up. In that kind of use, the filing jig will not help. I also don't see how you will draw file well with one end stuck. But I guess most people who use filing jigs don't do draw filing I suppose? There's a use for filing jigs, and that is if you want to create a flat end on a small surface, with is too small to guide the file, and you don't have a belt sander. But on blades, I see it as a hinderance rather then an advantage.
  2. That's easy enough to tell from the picture, the one on the left is at half the distance compared to the one on the right, therefore the one on the left is taking twice as much weight as the one on the right. So the one on the left is taking 2/3 of the weight, and the one on the right 1/3. In other words, you're lucky that there's additional safety margin build in those ladders.
  3. Reverse at full speed, then slam the brakes I had something similar, but missing the top. I gave it away as I had to clear space, and it was gone instantly. Nice solid steel, industrial workbenches are great. Having a work bench that does not move at all when your filing, sawing is a great help. I now use the dinner table as workbench (as does my girlfriend), which is solid oak, but not quite as inflexible and heavy unfortunately.
  4. With Jalapenos? I thought these were on the very low end of the Scoville scale? This year I got a pepper plant at the green house, thinking they would be ordinary chillies. Instead, some weird tiny shriveled peppers started growing on it, and a lot of them. I found out they most likely are Scotch Bonnets. It only takes a few crumbs of that to make a good spicy meal and they also taste wonderfull. Of course I had cut them up bare handed when I wanted to dry a batch. For the next few days I had very spicy fingers
  5. Thanks! You hold the entire handle in your hand, including pommel. So the pommel prevents it from roling. With this one, two fingers go over the straight bit, the third over the pommel. I've got a reproduction of a larger one, where 4 fingers fit over the handle, but you still cover the pommel when holding it in a handshake grip.
  6. It's one of those things, if it takes a few seconds to sharpen, you will sharpen it, if it takes a few minutes, you won't, and let it go dull until you get fed up enough to spend the time to sharpen it. I have a wood cutting knife that's one of those permanent temporary tools made from an early failed blade from just mild steel. It takes a few strokes with a file, and it's will effordlessly/ cut dry would for hours. Of all the knives I use regularly, I bet that on average that one is the sharpest during use.
  7. Just a small comment: that tang looks very thin, and therefore very weak. Is it meant for very light use only?
  8. Jup, I had some time to study it up close, and take detailed measurements and photos (not for distribution though). I already had some detailed drawings, and was able to verify that they were accurate.
  9. Not a lot of parts in aircraft are made of steel. I've rarely had to design anything in steel, and I never worked on engine parts, so I can't help there very much in determining what type of steel it might be. However most steel or other alloys can be found either in MIL-HDBK-5 (outdated) or MMPDS (newer). MMPDS you probably won't easily find online except as expensive download, but MIL-HDBK-5 is easier to find (f.e. here: http://www.barringer1.com/mil_files/MIL-HDBK-5.pdf). It doesn't list hardness, but yield strength can be used as indication, and there are conversion tables online which allow you to see the relation between yield strength and hardness. I don't know of any steel that would have the kind of properties as you describe, with a very high hardness or yield strength, combined with a high ductility. In general the rule is, the harder the steel you choose in a design, the more brittle it will be, as you'd expect. It sounds more like it may be case hardened? So it's got a outer layer that is hardened, but inside still soft and mallable? I do vaguely remember from materials classes that that was done for shafts in particular, but I could be wrong (it's been 2 decades).
  10. Probably not. While a there is a lot of organic material preserved in bronze age burials, evidence for leather wrapped hilts is virtually completely absent from the bronze age (except for one sword). Absence of evidence of course isn't evidence of absence, but it works well without, so I keep them as is.
  11. Not completely straight, but the tip needs to be lower. Here you can see one of the stone mould casts in the mould, where you can see how much the tip curls up after hammering out the edge:
  12. This is a reproduction of an antenna hilted knife from the urnfield period. It's based on an original found in Csóka, Serbia. It's 20cm long, made from 12% tin bronze and with a workhardened edge. I previously cast these in a soapstone mould. The mould was lost, so I made a model from one of the casts, where I had to undo the curve and thicken up the edge, so that I could cast them again and hammer them to the correct shape after casting.
  13. Soon I'll be casting a reproduction of the giant bronze age Ommerschans dirk, recently acquired by the National Museum of Antiquities in Leiden, Netherlands. In preparation I've cast the regular sized dirk that these giant ceremonial versions are most likely based. The regular size version is the so called Kimberley type dirk. At least two nearly identical blades of this type have been found. One has rivets, so originally would have been hilted. The one found at Kimberley never had rivets, and is therefore already a "ceremonial" version, just like the much larger ones. The Kimberley dirk is 34cm in length, and weighs just over 300gram. My reproduction is a little bit heavier, but the overal dimensions and maximum thickness match the original. The original dirk is in the collection of the British Museum, but sadly not on display: http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=808735&partId=1
  14. He keeps popping up on the Backyard Metalcasting FB group. Fortunately that group is run by some professional casters, who will always address the safety issues. However, he keeps inspiring people to put their lives at risk. Naturally there are people who will then go against it and consider it all a bunch of whining, because they have done it, nothing has gone wrong and they are still alive. I just consider it spending your changes, until all of your chances have been spend. And I prefer to not to spend them too fast, while still being able to do exactly the same thing, just using slightly more thought out equipment.
  15. New casting flask, one of my largest ones so far. That's an A5 (=5kg capacity) crucible sitting next to it, which will be used to cast in this one.