|bruised palms and steel in my hair
||[Apr. 25th, 2011|03:01 pm]
I finished machining the bevels on the next batch of pizza cutters, giving me four to work with assuming they all survive heat treatment. One is wrought iron, which I've case-hardened and will polish down to see if that gives me any interesting effects. One is W2, which will be differentially heat treated to see if I can get a hamon -- it's nearly 5" across, so there's a lot of real estate to play with. Two are damascus, one with a straight lamellar structure, one with a more wavy/curly structure, about 3" diameter. The as-machined finish off the lathe is pretty rough, but you can clearly make out the patterns in the damascus, a neat effect. |
As for the steel in my hair, lathe work, even with a hat, seems to get those twisted bits of jagged metal everywhere. I may just have to get a haircut if I'm going to keep doing this.
Getting rid of that roughness isn't that difficult, at least using the method I've settled on. Mount the wheel on a mandrel -- I'm using a 10" long tapered punch -- and hold the pointy end between your fingers, and use your other hand as a thrust bearing to press the disk against the contact wheel. This allows the disk to turn in a controlled fashion, which makes for an even finish. The problem is that the friction between the grinding belt and the disk tries to spin the wheel, which if allowed to occur results in the disk spinning at a truly remarkable rate, but also lacks the control needed for safe operation. As a result, my palms both have fairly large, but minor, bruising.
The wrought iron wheel was packed into a stainless-steel foil envelope with some commercial case-hardening compound and bone charcoal, and allowed to soak in a furnace for an hour, at which point I discovered the foil had burnt away. So, I took it out, re-wrapped, and turned off the furnace and let the package soak while it cooled down. I hope that will be enough to get some carbon into the edge, I'll find out tonight.
The furnace was running as I was attempting yet again to smelt some ore down into something useful. ~1kg of ore, 200g of charcoal, and a lot more flux (borax, fluorite, and green bottle glass), fired for ~6 hours. Again, will find out tonight if it worked.
I'd have pictures, but sadly my smartphone is dead, drowned when I went out walking and got caught in the rain a couple of weeks ago. I've checked online and found a couple of companies offering repair services, anyone have any experience getting a phone repaired?