Re: Eagle Surface Grinder

On Mon, 26 May 2008 20:13:11 +0000, Christopher Tidy
<cdt22NOSPAM@xxxxxxxxxxxxxx> wrote:


As for wheel grit types, there is as much debate here as the HSS vs
Carbide debate. In general, a harder steel needs a softer wheel, and
vice versa.

Why is this? I'm curious. Is it because lost grit gets embedded in a
softer workpiece and then wears away the grinding wheel?

Best wishes,

Chris

The hardness refers to the strength of the bond holding the grit
together, rather than the grit itself.

A hard material will dull or blunt the grit, and if it doesn't break
off then the wheel will glaze and not cut, so a softer wheel allows
the grit to break away easier and then effectively presents a sharp
new cutting edge.

Softer materials don't wear the wheel so much, so can use a harder
bond.

Peter
.

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