Showing posts with label blowtorch. Show all posts
Showing posts with label blowtorch. Show all posts

Friday, 7 August 2015

Delft clay casting, pt1: tools issues, copper issues, and a lot of issues in general. And shibuichi.

If you're following me on google+, you may know that I recently ordered supplies for casting. I have a lot of scrap copper laying around, and I wouldn't be able to make anything out of it, so I've decided to try my hand at casting. This way I could still use that copper, and it wouldn't be wasted.
 So, I've got my waxes, crucible, tongs, and of course the delft clay, and got to casting. And found out that melting copper is a pain. It either wouldn't melt at all, or wouldn't stay liquid long enough for me to pour it into the mould. It was frustrating, to say the least.
Tools!
I've spent 1.5 day trying to melt the copper. Then, at the second day, I manged to do this, and it aaalmost stayed liquid long enough to pour it, but it hardened as it was flowing toward the edge of the crucible. I deemed that partial success, and was eager to try again, and that's when I noticed this:
 
Poor torch :(
I did manage to melt the copper, but the plastic casing of my torch... not exactly melted, but, well, did what you can see in the pictures. I got pretty scared it wouldn't work, or that I wouldn't be able to change burners, but after it cooled I found out that I can remove the burner and attach another, the torch works, and the only damaged part is the upper right hand side of the casing closest to the nozzle.
Thankfully, the damaged part isn't anything vital for the torch operation, and the damage is superficial, and limited only to this side.
Feels ;(
But it's pretty clear that one won't melt copper without taking damage. So I had buy another. At first I wanted to order something via internet, but then anything I liked was expensive, and I would have to wait another several days before I would be able to continue my casting experiments, so in the end I went shopping, remembering that the shop I got this torch stocked also a bigger one, without any plastic parts near the nozzle.

It's huge and quite scary
This one makes the biggest flame I ever handled, and unfortunately doesn't have automatic ignition. By now, I got the hang of firing it up, but the first time was scaaryy. Sorry for the crappy pictures, by the way.
Huge flame or not, I still had problems melting the copper. I'm not sure what I'm doing wrong, but I can get it to a semi-liquid state, and then... it suddenly cools and solidifies. I don't know if I direct the flame wrong way or what, but that's what happens.
So I got rather discouraged and angry. I also remembered I had a little bit of scrap silver, and decided to see if I can melt that. And if I can pour it into the mould. It went much easier, though I had to try 3 or 4 time before I managed to get it into the mould without the metal solidifying half-way through.
However, I had only 2.8g, not enough to cast anything. But at least I got to practice pouring the metal. It's not that easy.
But I still wanted to melt that scrap copper. And today I read about Japanese copper and silver alloy, called shibuichi. It comes in different ratios: one is basically sterling silver, but there are other kinds with bigger amount of copper. It can be 90%copper 10% silver, or 95%copper 5%silver, or 60%silver 40% copper, and so on. There are also mixes with tiny percentage of gold (like 1%). what's more, it melts in lower temperature than copper and pure silver. I decided to make 70% copper 30%silver mix.
I thought I would have to melt copper entirely before adding silver. But, typically for Murphy's Law, when I needed molten copper, it just wouldn't melt. I got angry, and tossed the silver in when the copper wouldn't get to even the half-liquid state. The silver melted right away. And, surprise, surprise... suddenly I had crucible of fully liquid metal. It took seconds for copper to melt as well once the silver was introduced.
I managed to get it into the mould as well, and quite easily at that.
Crucible with a little bit of metal solidified near the edge. The red stuff is borax. Not sure why it's red.


I don't have enough of that alloy to cast any of the models I have, not even enough for one thin ring band, but I'm going to buy a bit of silver casting grain, and make some more.
It has a lovely colour, kind of silverish-brown with a light pink undertones. It reminds me mostly of pink gold, though it's lighter in colour.
I have only one, bad picture, but here it is:
Partial success at casting
The yellow is patina, it can be easily removed with sand paper. It's not anywhere near perfect, but I'm happy I can melt it, and keep it liquid long enough to obtain the cast. I'm not sure why there are those tiny dimples in the casting. I'm going to rummage through the internets and try to find out.
Ufff... so that was the first week of delft casting experiments. I'm definitely more encourage to keep learning this now that I actually have metal that I can melt. The details wouldn't be bad if it wasn't for those bubbles, holes, or whatever these are.
I hope the next week will be more better!
Till the next time,
Kasia.
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Thursday, 23 April 2015

Torches, charcoal blocks, soldering boards, lockets in progress and a whole heaps of plans.

Right. I've been absent from the blog for over a month, I didn't show promised cuff pictures... bad blog owner! Bad! All because the first time in I don't know how many years I managed to catch a really, really nasty flu. Not only I felt downright miserable, and couldn't think straight for ridiculously long time, but it also knocked me off my feet (not in a good way), and getting myself back together took quite some time. 
After I finally got to the point where I was able to do anything other that laying in bed and feeling sorry for myself, I decided that I would like to try my hand at making lockets. So I designed one, cut the pieces, painted them, etched them, and when it came to soldering, I found out that my trusty lovely little blowtorch is... too small. And can't get the piece hot enough, so the solder was balling up, and generally not cooperating with me. The logical step was, of course, to get a bigger blowtorch. Which I did last weekend, though figuring out what torch I would like to buy took some time. The fact that the post will not deliver gas cans complicated matters a bit, because I had to buy something for which I can buy gas containers in brick and mortar store- it really is not that simple, as I live in a rather small town. At first I wanted gosystem torch, but my local hardware store doesn't carry their gas cans. It does, however, carry campingaz torches and gas cans, and this is what I got. I had two options, and actually bought the one I didn't intend to buy at first. But that one has piezo ignition, and I'm terribly jumpy around gas devices without automatic ignition system. And what a monster of a torch it is! Here, have a picture (with my little iroda for comparison):
By the way, my table is not that messy when I'm actually soldering something...

It runs, as you can see, on butane/propane mix, and reaches 1750 °C. And the flame is HUGE. But it soldered the joint I was battling with for more than a week at the first try, in few seconds. Good news is, you can buy replacement burners, and there is one particular model, called x1650, that gives you a fine flame, suited, as producer claims, for jewellery and model making. Bad news- it proved difficult to find, and virtually unavailable in the UK. I had to buy one from Germany, pay ridiculous price for postage, in effect paying for a burner about as much as for the torch itself. 
After I soldered the one joint, I decided that my magnesia block alone was no match for that monster, and I need to buy more adequate soldering surface. Apparently, a charcoal block can withstand up to 3000 °C, and I don't have anything that reaches temperatures anywhere near that mark, so I bought one. I also bought soldering board, to rest the charcoal block on, because the flame produced by that big torch is big itself, and produces quite a bit of heat, therefore I found the set up I was using with my butane torch not satisfying. I may be over-cautious here, but better safe than sorry. Oh, I also got a third hand while I was doing my shopping, because I really had no clue how to solder on the bail I designed for the locket, and in the place I designed for it, without something of that sort. I never used one before, but I hope it will work well for me. 


*I wrote the above yesterday, with intention of posting it today, and today morning my fine flame burner was delivered. I'm really happy with it: it can make a big flame, but also, contrary to the default burner the torch was supplied with, it can also make a really small one, which makes work a lot easier: the smallest flame of the default burner is still so big that I have problems seeing just what exactly is happening on the soldered piece. With that new burner, I can create wider range of flames, so it's way better suited to the type of work I use it for. It was totally worth all that rummaging through the internets and ordering from Germany.
Picture time!
There is not much outside difference between the two burners, but there is a big one performance-wise


My shiny, new, as yet unused charcoal block on top of my old, much used and abused, crumbly but loved, magnesia block:





 Charcoal block, soldering board, third hand, tweezers, beginning of a locket, and a really weird perspective:





And the beginning of a locket on my new charcoal block (I haven't used it yet, but I'm already awfully fond of it, can you tell?) :

Sorry, but you need to click on the picture to see it better. Why doesn't blogger have a decent gallery making options? Or is it just me?
 That's actually going to be the back of the finished piece. I'm planning red abalone cabochon on the front. Also, note the huge overspill of solder. That's all result of trying to solder this with my little torch. Once I applied the monster to it, it all decided that it can, in fact, flow, and there was what I can only describe as a solder flood. I just can't wait for all that sanding and cleaning it up....


I also have no idea if I'll manage to solder the hinge knuckles on properly... that remains to be seen. Honestly, that hinge terrifies me. I just hope I won't botch it entirely. On the side note, that wolf etching you see here is the first etching with nail polish as a resist I really like. I think I finally got the hang of using nail polish to achieve the effects I want.


I'm also thinking about writing a series of posts about recurring motifs in my designs - namely, wolves and ravens. I've written some "sketches", but I'm still not quite sure how to approach the subject. I know I'm going to start with wolves, but the piece I wrote on them needs a lot of polishing and finishing touches- I intend it to be something of an introduction to the species, but right now, I think, it's probably too technical, and possibly I'm writing about too many different aspects for just one post. I will have to do some hard thinking about it, as I wouldn't like to bore the living hell out of readers ;) What I know I want to do with that planned series, is to write about biological, ecological and cultural aspects of them. Thing is, for me by far the most interesting of these are ecology and biology, with cultural bringing up the rear, a loong, looong distance behind the former two, and I tend to get overexcited with technicalities and details. But the again, being wolf researcher and behaviourist is my unfulfilled childhood dream, so what would you expect ;)


Which brings me nicely to my other plans, though those are a bit nebulous at this time. My other big dream was to be palaeontologist/evolutionist. If something distracts me from designing and making jewellery, it's likely to be bio/palaeo/evo stuff. Synapsids, and their evolutionary line, are what I'm especially interested in. I'm writing about this, because I was thinking about somehow linking all my passions together in my jewellery designs. I'm thinking, vaguely right now, about adding prehistoric creatures to my designs. It would be in similar style to what I'm making now, probably, but the creature featured would be something that is, sadly, no longer with us. Like Inostrancevia. Or Homotherium. Or Diictodon. Or something ;) The idea gets me all excited,but I'm not sure how it will work out in the end.
 
Here, have a Homotherium latidens to illustrate that paragraph:




A word on the cuff: I don't like how the etching turned out, and decided it needs a bit of touch-up. With hand engraving. I have a set of hand gravers, I just need to learn how to use them properly, so that may take some time. I'm not ready to discard that cuff just yet. I hope it's salvageable. 
Soo... lockets, maybe palaeo stuff in designs, probably series of posts about wolves and ravens, hand engravings... that's what I'm working on right now, and I hope there will be no other flus to turn me into some kind of particularly immobile, sloppy rag wrung to within an inch of its life, and I will be actually able to do all of the above :)  
 
Till the next time (preferably not in a moth's time)
Kasia