1 degree angle 9 inch disc grinder ok for flattening scale materials?

M

Maelstrom78

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Sep 21, 2013
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Because that is when I have set up on a 1750rpm reversible disc grinder. I'm going to build a 90 degree work rest for it and I'm wondering If the one degree taper will be ok? My thought is that it would ad is it so slight and hopefully I'm placing the material flat against it anyway but I thought I would still ask the question. Thanks!
 
Seems like it should be fine. The taper is just there for clearance when working a blade longer than the disc's radius.
 
I've used a 1 degree for flatten scales for years. just move it in to the middle and out to the edge as it turns. Variable speed works better for everything!
 
Laurence' answer is by doing it. Done his way it must work. In fact they do produce a very fine hollow when working on a blade.
Frank
 
I was told years ago that the 1 degree bevel would cause a hollow on the scales . They even explained to me why but my poor brain cannot see it . The disc was cut on a lathe , the edge is thinner than the center ,the rest is still flat . I do not know .
 
I can't visualize how a 1* bevel would produce a hollow. Would someone please sketch it. Thanks.

Tim
 
I am sure it will work, but in my experience a 4X36 or a 6X48 woodworking belt sander with a good 36 grit belt will do the best on cleaning up scales and blocks.
 
tim37a said:
I can't visualize how a 1* bevel would produce a hollow. Would someone please sketch it. Thanks.

Tim
Click to expand...

A disk machined with a a small bevel is essentially a cone. Imagine if the angle was 45 degrees. It may help you visiualize how the grinder surface will not produce an exactly flat grind. One degrees is so slight that the hollow is probably only about .001" per 1" surface width. Essentially un-noticable.

Mike L.
 
It is a cone shape, so it will grind a slight hollow (a conic, not a radius, for you geometry nuts) which become a tighter bend as it approaches the center. But it's a very slight curve.

Something to consider is a perfectly flat disk will never grind a perfectly flat surface if there is any wobble in your setup at all. The resulting surface is going to have a little bit of a crown in it. Nobody can hold something in their hands perfectly flat and this can be easily verified with an accurate straight edge and a strong light source. So, starting with a very slightly hollow grind might offset that a little. Meaning, in the end, I think that for most applications it's probably just as good. Nothing is ever perfect, even when done on high precision machines, which an offhand grind is not.
 
Thanks, Mike and Nathan. Got it. Now I know how to put a slight convex grind on my blades!!

Tim
 
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