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| S. Heslop:
I understand that people appreciate some weird stuff, but what gets my goat is when certain things become associated with quality. I'm sure you've probably seen some of the horrific bluegrass banjos out there. In other news, I tried hardening the leftover tang of that rasp and it did indeed harden. I've got the other half of the tang that I might try coating with bar soap to see if it at all protects teeth as it's heated. I also remembered i've got a big bunch of 50x50x5mm angle iron that would probably make a good canister for case hardening if I weld two halves into a square tube. It'll also be nice to weld something with some thickness for a change. It seems like everything I weld is either tiny or very thin. |
| S. Heslop:
Tried it with a bit of soap and a gas flame and it seemed to do something. It didn't harden as well as the previous bit though, since I didn't let it 'soak' I suppose. Wish I thought to take before and after photos, but it didn't seem to degrade too bad. The two leftmost teeth are snubbed off because I brushed them with another file seeing how hard they got (not very). I also didn't do a great job forming the teeth either. Trying to get that rebar to harden. Spent a good while whittling that into a chisel shape, roughing with a hacksaw. But it's too chunky to easily heat and I think I jumped then gun on quenching it; hadn't gotten it hot enough. |
| awemawson:
Some nice old rasps in this thread on the welding forum - reckon a bit of negotiation might liberate some for you: http://www.mig-welding.co.uk/forum/threads/worth-80quid.55640/ |
| Lew_Merrick_PE:
Simon, >> I think I jumped then gun on quenching it; hadn't gotten it hot enough. Try using a magnet on a wire. [I use .004 inch music wire because I use that in a number of other operations.] A good AlNiCo magnet should draw towards the heating part enough to see while staying far enough away from the heat source. [Do not try this with neodymium magnets as they do strange things when they get "warm."] When the steel no longer attracts the magnet, you are (approximately) at the correct temperature for hardening. |
| S. Heslop:
I did have a magnet I was using, but it fell into the garden somewhere when trying to anneal the rasps and i'll probably never see it again. Got a few old speakers from a TV i'll probably never use, so I might try borrowing a magnet from those. |
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