That looks just like the pattern that was cut into the hoof rasp. Looks pretty neat. Dont know why it would show up after you ground the rough part off. Hoof rasps usually have a differn't cut on each side. If this one did, does the pattern on the other side look differnt from this one?
-
The BladeForums.com 2024 Traditional Knife is ready to order! See this thread for details: https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
Price is$300$250 ea (shipped within CONUS). If you live outside the US, I will contact you after your order for extra shipping charges.
Order here: https://www.bladeforums.com/help/2024-traditional/ - Order as many as you like, we have plenty.
this is strange need advice
- Thread starter rotor
- Start date
- Joined
- Nov 24, 1999
- Messages
- 4,981
I'm not anywhere near being an expert on steel. But I train horses and am pretty good friends with a farrier. Heres what I can tell you that might help some of you more knowledgable people figure it out.
Theres two ways that horseshoe rasps are made right now so far as I know. A company called Mustad just started this last summer and gave a few sample rasps out to farriers for feedback. They were made of a tool steel rather than the lower grade stuff normally used, and were formed then hardened/tempered. The idea was to make them last a lot longer.It seemed like they hadn't quite gotten the teeth right but they were going to be generally well accepted, especially if they fixed the teeth. If you guys get ahold of any used files that seem fairly new and have Mustad stamped just about the tang, you should be getting a peice of tool steel.
I'm not sure about how they were making them before, but it sounds like it was with lower quality steel that was sheared into shape and then case hardened all in one process.I almost got the impression that the teeth were formed after the file was case hardened but I'm not sure if you could do that. It was supposed to be cheaper but it yielded rasps that wore out fairly quickly. It did get the right toughness for the teeth though. They had to have hard tips so they would cut, but had to be shock resistant enough that when you got to filing horseshoe nails they wouldn't break off.
Anyhow because of being case hardened and the way the teeth are sort of gouged and bent out, leaving a pit behind them. The hardness would have followed a really strange pattern in the surface of the file. You ground off most of the hard stuff which I think would leave you with a very thin hard spot at the botom of each pit, where the hardness would have gone the deepest and then unhardened steel around it. Since you didn't normalize it , the grain that had already been heat treated once would be more refined, than the rest. And because its not the greatest steel , although probably not bad at all, it may have a fairly coarse grain structure which would make the difference in refinement stand out more. Internal stress from the shearing process may also play a part.
Theres two ways that horseshoe rasps are made right now so far as I know. A company called Mustad just started this last summer and gave a few sample rasps out to farriers for feedback. They were made of a tool steel rather than the lower grade stuff normally used, and were formed then hardened/tempered. The idea was to make them last a lot longer.It seemed like they hadn't quite gotten the teeth right but they were going to be generally well accepted, especially if they fixed the teeth. If you guys get ahold of any used files that seem fairly new and have Mustad stamped just about the tang, you should be getting a peice of tool steel.
I'm not sure about how they were making them before, but it sounds like it was with lower quality steel that was sheared into shape and then case hardened all in one process.I almost got the impression that the teeth were formed after the file was case hardened but I'm not sure if you could do that. It was supposed to be cheaper but it yielded rasps that wore out fairly quickly. It did get the right toughness for the teeth though. They had to have hard tips so they would cut, but had to be shock resistant enough that when you got to filing horseshoe nails they wouldn't break off.
Anyhow because of being case hardened and the way the teeth are sort of gouged and bent out, leaving a pit behind them. The hardness would have followed a really strange pattern in the surface of the file. You ground off most of the hard stuff which I think would leave you with a very thin hard spot at the botom of each pit, where the hardness would have gone the deepest and then unhardened steel around it. Since you didn't normalize it , the grain that had already been heat treated once would be more refined, than the rest. And because its not the greatest steel , although probably not bad at all, it may have a fairly coarse grain structure which would make the difference in refinement stand out more. Internal stress from the shearing process may also play a part.
