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| vtsteam:
Wouldn't using it clean any wire edge up? Just like stropping. Doesn't look like much scale at all, and I'm afraid the acid will actually eat the sharpness off the tips of the teeth. |
| S. Heslop:
--- Quote from: vtsteam on June 23, 2015, 02:37:47 PM ---Wouldn't using it clean any wire edge up? Just like stropping. Doesn't look like much scale at all, and I'm afraid the acid will actually eat the sharpness off the tips of the teeth. --- End quote --- It's not for the scale, but to sharpen it. I believe that before sand blasting files were sharpened with acid. It's also something people use to resharpen old files and rasps. Either way, i'm going to test it first before risking the rasps. |
| DavidA:
I'm clearly missing something here. But why go to all this effort to make something like a rasp when you can buy them. Surely the cost in time alone is many times the cost of a new one. Dave. :scratch: |
| vtsteam:
David, there are many reasons for making things you can buy, from understanding how things work, building skills, learning about the history of toolmaking, learning associated processes amd material properties, taking on a challenge, and possibl producing something better for your needs than what you can buy. Rasps, by the way, aren't always cheap. Certainly not handmade custom shaped types. Smon, my understanding is that the "sharpening" of new files by sandblasting is a sharpening step, not necessarily what we mean more generally as "sharpening", and that particular step is the removal of the wire edge after forming the actual point. A strop is used for the same thing on straight razors and similar processes on other edged tools. The strop doesn't actually sharpen by refining a point using an abrasive -- it's just leather and the blade is run backwards over it, it breaks of a tiny bit of excess past the end of the tip. I believe that's what the sandblasting does. |
| S. Heslop:
I ran a test with vinegar on one of those tang cutoffs overnight and it didn't seem to sharpen the teeth more than they already are. And the rasp does cut fine as it is. So yeah i'm probably going too far with it. You're also right about why i'm making rasps. It's partly something to do, but it also gives me a chance to try out a few things i've wanted to for a while. Although i'm sure what i've produced isn't any better than what you can buy. Still waiting on good weather to try case hardening. In the meantime I might start actually working on the neck. It's still a good bit away from the point where i'd even need the rasps. Carving it round seems to be the last step since the earlier ones are obviously easier if the thing is still square. |
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