Sharpening angles

**les88** · 16th July 2007, 07:25 PM

At a wood working sale the demonstrator of the Supergrind wetstone grinder ground the plane blade to a perfect angle. I asked how do you do the angle that is normally done on the oil stone after grinding. He said that's it is only one angle. My tech teachers taught me to do a grind angle then oil stone the cutting angle. Have I been doing it wrong for 55 years?

les

**Groggy** · 16th July 2007, 07:50 PM

Les, it can get a bit confusing.

The supergrind and other wheeled grinders, wet wheels etc leave a concave grind on the blade. You can then hone the blade on a stone and only the heel and toe of the bevel are honed.

When you went to school they may have done one angle on the stone to get a bevel and another angle for honing to avoid having to hone the entire bevel.

**IanW** · 16th July 2007, 08:09 PM

Les,
As Groggy sez - the honing angle is so you don't have to polish the whole damn bevel after 'grinding' on a coarse (flat) oilstone, as was done for many a long year before grinding wheels became so common. Round wheels leave a concave that makes life easier.

The main thing is to end up with an included angle somewhere between 25 and 30 degrees (for a bevel-down plane blade, anyway). This is a compromise between acuteness of the cutting angle, mechanical strength, and clearance behind the cutting edge, and subject to minor variations depending on personal preference and the hardness of the material you're working on...

Just how you arrive at this happy state is a matter of ENDLESS debate.

Cheers,

**les88** · 17th July 2007, 08:23 AM

thanks for your input guys, I will get a wet wheel grinder at Canberra WWW
les

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