How to grind bevels lengthwise on a 2 wheel coote-style grinder?

adinb114

adinb114

Joined
Feb 25, 2011
Messages
651
Hi folks.

I've seen multiple makers here getting excellent faux hand sanded satin finishes by grinding their bevels lengthwise. I've never seen this done, but I assume it is accomplished by placing the bevel on the flat platen attachment of a KMG style grinder with the shoulders above the top roller wheel. If you out there who practice this technique could explain the details to me, that would be very helpful.

Anyways, my main issue is this. I have a coote grinder which doesn't give me the same sort of sharp angle as one would have on the platen attachment of a KMG or Bader. I'd like to figure out a way to grind my bevels lengthwise without grinding my shoulders using my current set up. If there's anyone out there who does this on a similar grinder and has any tips, tricks, or bright ideas to share, they would be much appreciated.

Cheers,
Adin
 
Well, I am no expert, but the only person I know of that does this is Brian Fellholter, and he has really designed an attachment specific to this task. Its neato, he posted it here so you can probably find it.
 
I know at least one mastersmith who uses a ramp platen with 1/8, 3/16, and/or rollers for cleaning up plunges, making sure the flats are dead flat, and for grinding integrals. Wouldn't work with a 2 wheel grinder though. You might could make the platen stick out enough to get a similar effect. One of the challenges is that you have to run the machine slow for the tiny wheels not to heat up. If you don't have variable speed, it doesn't seem likely to work IMO.
 
I've watched about every knifemaking video on youtube and I remember there being a couple in which the maker did all the bevel grinding lengthwise on a 8" (I think) contact wheel. Also, I believe Nathan Carothers has an attachment that he uses to grind in the plunges that uses a flat platen that sits horizontally and the belt drops over a radiused edge. It is certainly a slow speed attachment because there is no idler wheel and the friction dropping over that radiused edge would be very high.

Bob
 
I grind 80 and 120 lengthwise with no top roller at 2,000 SFM and slow it down for finer grits. Some form of cooler or chiller is required to keep from overheating.

81_zps4b566cf4.jpg~original



A 400 grit belt finish:

2.jpg~original
 
That's clever. Every time Nathan or Nick post something I'm overcome with the need to build one for myself.
 
Thanks everybody, I really appreciate the pictures Nathan. For the time being this option doesn't seem feasible with my current setup, but I'll definitely move in this direction at some point.
 
If you have a steady hand you can do it on a rubber contact wheel. Plunge at the heel of the blade is a little larger radius, though.
 
You can probably pretty easily make an attachment just like this one shown below which is meant for grinding intagrals.. I guess it's it pretty much the same idea as Hengelo showed above, basically just a small wheel attachment with a flat surface on top.

You would have to make sure that the top of the small wheel is at the exact same height as the top of the flat surface (platen).

grinder3.jpg


Anyway here is the link to it for more info.. http://w.ivenue.com/riversidemachine/ecommerce/grinders-machines/riverside-intergal-grinder.html

-Paul
 
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