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8th April 2013, 12:34 AM #46
Russell, the 600 is already more rounded.
Regards from Perth
DerekVisit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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8th April 2013, 01:21 AM #47GOLD MEMBER
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I think that the 600 edge will still be, say, 28 degrees. However, the grit particle size will leave many "run-out" scratches which go all the way to the edge. Those make the edge highly variable in thickness = lots of little, flat teeth, side by side.
I don't see that I encounter any uniform blunting of the entire edge at all. Over time in use, what I do see is an increasing number of "light-sparks" as bits of the edge crumple to reflect a very strong incident light. I have been using a 20X magnifier to observe this in one spoke shave blade when compared with the other, unused blade. Discouraging, but I can follow the progress. A few swipes on 600, then the same or more on 1500 makes a smoother edge with smaller run-out scratches. Honing the edge (chrome green, 0.5 micron) only changes the scale of the scratching.
This is why I think the refined edge last longer. There's more uniformity.
Remember that the reported grit sizes are "nominal" particle size. Although the standard deviation may be small, I suspect that there's a (statistically) 'normal' distribution of particle sizes. Some bigger, some smaller. Quality control can only narrow down, never eliminate that distribution.
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