The term over-honing can mean a few things, it's sort of an ambiguous term. In the old days, it was, seemingly, used to refer to honing that created a wire edge. The issue of burrs was not alledged to be caused by pressure, it was claimed to be due to excessive laps on a finishing stone, usually barber hones. At least, that is where I recall the term used most often. I've documented/proven the claim myself here; doing a lot of laps on a very fine stone or very fine slurry can result in edge distractions, burrs, wires, foils, etc. this has been regardless of pressure or force. And yes, it is possible to create a large burr using force/pressure also.
Speaking for myself, I achieve max on a Shapton or Nani 12k in under 12 passes usually. Maybe 15. Pretty much same for my work on an 8k. Once in a while I might approach 20 laps on an 8k. My observations are confirmed via empirical evidence; viewing under extreme magnification on a metalurgy scope in dark-field mode, as well as simple observation under less magnificaiton and shave tests also. Those stones are in fact that fast. I found this to be true early on and many years and blades later it's still true here in my house with my gear.
For me, if I was forced to continue honing past those low lap counts on a high grit stone, it would only be becuse the previous work was not handled correctly.
A 12k is fast at removing proper 8k striations, very fast actually. The Nani is faster than the Shapton in this regard. Neither 12k will remove enough steel fast enough to be a realistic option for a full bevel-set on an Ebay blade or a bevel that was set on a 1k. Remember, the amount of metal to remove after an 8k stone's work was executed correctly is super minimal.
The stones I'm referring to are Naniwa or Shaption, adding an 8k that is actually a 5k (Norton for example) into the mix might not yield the same results.
A 5k can do a bevel set pretty quickly on a razor that has only been used enough to just throw things 'off' a bit - but it won't set a bevel easily on an Ebay edge or a 1k edge either.
A stone is fast relative to what it's working on, it's not a blanket statement relative to all other stones.
Shapton 16k & 30k stones have been known/proven to perform best with super low lap counts and that using higher lap counts often ends with edge distratcions. I can vouch for this being true with the .44µm series 7 stone.
The quality of the edge (meaning, bevel angle, state of polish, edge width) brought to the finishing stage makes all the difference in the world. For example - someone honing a stock GD with a marginally set bevel may not see edge chipping on a Shapton 16k stone after 15 laps. The excesively wide bevel angle and the less than stellar bevel-set work could possibly prevent the Shapton 16ks liabilities from showing themselves. IME, the edge will still be sub-par, at least for me it will be sub-par. Not everyone has the same reference points.
The same undercookd fat GD edge will also be more tolerant of extended honing on any other stone. Bottom line, a thinner edge width that has been highly polished to max on all stones is more susceptible to edge damage than one that is less refined. As a result, the results on razor A in the hands of honer B might not equal that of razor C in the hands of honer D.
Speaking for myself, I achieve max on a Shapton or Nani 12k in under 12 passes usually. Maybe 15. Pretty much same for my work on an 8k. Once in a while I might approach 20 laps on an 8k. My observations are confirmed via empirical evidence; viewing under extreme magnification on a metalurgy scope in dark-field mode, as well as simple observation under less magnificaiton and shave tests also. Those stones are in fact that fast. I found this to be true early on and many years and blades later it's still true here in my house with my gear.
For me, if I was forced to continue honing past those low lap counts on a high grit stone, it would only be becuse the previous work was not handled correctly.
A 12k is fast at removing proper 8k striations, very fast actually. The Nani is faster than the Shapton in this regard. Neither 12k will remove enough steel fast enough to be a realistic option for a full bevel-set on an Ebay blade or a bevel that was set on a 1k. Remember, the amount of metal to remove after an 8k stone's work was executed correctly is super minimal.
The stones I'm referring to are Naniwa or Shaption, adding an 8k that is actually a 5k (Norton for example) into the mix might not yield the same results.
A 5k can do a bevel set pretty quickly on a razor that has only been used enough to just throw things 'off' a bit - but it won't set a bevel easily on an Ebay edge or a 1k edge either.
A stone is fast relative to what it's working on, it's not a blanket statement relative to all other stones.
Shapton 16k & 30k stones have been known/proven to perform best with super low lap counts and that using higher lap counts often ends with edge distratcions. I can vouch for this being true with the .44µm series 7 stone.
The quality of the edge (meaning, bevel angle, state of polish, edge width) brought to the finishing stage makes all the difference in the world. For example - someone honing a stock GD with a marginally set bevel may not see edge chipping on a Shapton 16k stone after 15 laps. The excesively wide bevel angle and the less than stellar bevel-set work could possibly prevent the Shapton 16ks liabilities from showing themselves. IME, the edge will still be sub-par, at least for me it will be sub-par. Not everyone has the same reference points.
The same undercookd fat GD edge will also be more tolerant of extended honing on any other stone. Bottom line, a thinner edge width that has been highly polished to max on all stones is more susceptible to edge damage than one that is less refined. As a result, the results on razor A in the hands of honer B might not equal that of razor C in the hands of honer D.