Three point grinding.

Fred.Rowe

Fred.Rowe

Knifemaker / Craftsman / Service Provider
Joined
May 2, 2004
Messages
6,848
Three point grinding, where you have not two but three points of control on a blade, is fairly easy to master. Three point grinding makes for very stable grinding with the result of having only one plane on the bevel surface, instead of a few, this comes along with equal plunge cuts.
With three point grinding the idea is to stay loose. The control is in your hands and not in your frame. If you can imagine grinding in a relaxed state, thats what this is.
I can and have ground blades standing in front of a grinder with my hips locked out, swaying from left to right; but once I got used to this grinding technique, that became a thing of the past. Three point is mush less tiring and easier on the body.


The blade being ground in the video is 20 inches long. Even with a blade this long its possible to keep the blade aligned all the way from plunge to tip.


The blade being ground in the video will end up as a 24 inch Scottish dirk from the 1400's.


[video=youtube_share;4yO335xL8EM]http://youtu.be/4yO335xL8EM[/video]
 
"The blade being ground in the video will end up as a 24 inch Scottish dirk from the 1400's. "

They do a lot of that in Pakistan, too. :) China specializes in 1200's blades. ;)
 
bladsmth said:
"The blade being ground in the video will end up as a 24 inch Scottish dirk from the 1400's. "

They do a lot of that in Pakistan, too. :) China specializes in 1200's blades. ;)
Click to expand...

You will notice, I don't have the blade held to the belt using my foot. I've learned something from those Pakistani videos.
 
Fred,

I understand your three point concept...framing with the hand and jig rather than the body but, as you go past your fingertips toward the point of the blade you are using your own skill and not the 3 point contact. I could see myself doing a flat on a short with your method (and for all that know me I still have trouble flat grinding to 9 ") but there is no way I could grind that knife you have with my skill level.
Dean
 
deloid said:
Fred,

I understand your three point concept...framing with the hand and jig rather than the body but, as you go past your fingertips toward the point of the blade you are using your own skill and not the 3 point contact. I could see myself doing a flat on a short with your method (and for all that know me I still have trouble flat grinding to 9 ") but there is no way I could grind that knife you have with my skill level.
Dean
Click to expand...
Its the thumb! Once the belt gets out beyond my fingers, I'm watching the bubble and exerting stability with pressure from my thumb. Also this is the second dirk I've done recently so I've had some practice. :D
If you have a grinder you could grind this blade using the Bubble Jig. If I'm working on long swords I place three of the bubble along the length of the blade so I can maintain the correct pitch.

Fred
 
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