Another "When is it worn out" question

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Originally Posted by MisterMoo

And hence my question. Where does recovery end and futility begin particular to spine thickness. Is a spent spine a sign of just plain done?

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Imo, yes. If the spine is shot, the razor is gone as far as I am concerned.
You can't tack steel back on, so any restoration attempt will still end with a worn razor.

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Originally Posted by edhewitt

I have been thinking about the even spine and edge wear thing, I don't think it woild hold true, as the amount of metal in contact with the hone would need to be the same on both ie if your bevel is 1/8" then the amount of spine in contact with the hone would need to be 1/8" or the narrower area would wear quicker, well maybe anyway, perhaps a metal working person could expand on or debunk this for me. Thanks ed.

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That's correct. Generally speaking, the spine doesn't wear as fast as the edge because the hone wear on the spine would be a bit wider than the bevel on the edge. With wedges, you sometimes see them being the same, which is also why wedges tend to develop wide bevels along with wide spine wear.