.

As just pointed out, singe bevels are not twice as sharp. They just are different......mainly in sharpening.
An angle is a product of three intersecting planes. If the blade thickness is a constant, then only the bevels height will determine the main edge angle ( ignoring the secondary bevel)....one side or two side ground, the angle will be the same within a few hundredths of a degree .

In actuality, many full flat ground blades have a lower edge angle than a partial height chisel grind.
For example;
A .125" thick blade 1.5" wide with a full flat grind has a 4.8 degree edge angle.
The same blade with a chisel grind of 1" on the ground side will have a 7.2 degree edge angle.

The slicability of the blade comes from the fact that the full flat grind will usually have a secondary bevel of 10-15 degrees, while the chisel grind can be used at the lower angle.
 
Look at a acute triangle. It doesn't mater if a 10 degree angle has a equilateral base or one of the angles is 90 and the other 80. The "sharp" angle remains 10.

If I took a perfectly chisel ground blade and then ground the spine off at 10 degrees I would now have a flat ground blade (with a out of line handle). The edge would not become duller when I reground the spine.
 
ib2v4u said:
If I took a perfectly chisel ground blade and then ground the spine off at 10 degrees I would now have a flat ground blade (with a out of line handle). The edge would not become duller when I reground the spine.
Click to expand...



Beautiful way to illustrate it. :thumbup:
 
As long as this came up again, I need advice on how to grind my piece, it is soo thin (1/32") I am really afraid to break it. I have some silicon carbide belts, but I am really nervous, should I tape it to another piece of longer thicker carbide (I have some laying around from my last attempt) the rigidity and support would be good, but it would be a little awkward to grind.
 
ib2v4u said:
Look at a acute triangle. It doesn't mater if a 10 degree angle has a equilateral base or one of the angles is 90 and the other 80. The "sharp" angle remains 10.

If I took a perfectly chisel ground blade and then ground the spine off at 10 degrees I would now have a flat ground blade (with a out of line handle). The edge would not become duller when I reground the spine.
Click to expand...


You are an evil genius
 
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