Grinding a false edge on a big fighter using the Bubble Jig.

Fred.Rowe

Fred.Rowe

Knifemaker / Craftsman / Service Provider
Joined
May 2, 2004
Messages
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The surface of this nine inch fighter was ground to 120 grit and was then given a dip in the acid just to get a look at the pattern.
The knife was ground from a canister welded billet that contained sections of 1 1/4 inch cable, set on end, with a mix of 1084/4600E powder to fill the voids.
The blade is 9 inches from, the soon to be filed shoulders to tip.

After the shoulders are ground she will be ready to harden.

In the attached video you can see the technique used to grind the false edge. http://www.youtube.com/watch?v=nHUarJNSV64

The angle of approach was set at 33 degrees, to grind the false edge, with the Bubble Jig being set on the bevel when grinding.
The bevels were ground at an angle of approach of 3 degrees.

It took about fifteen minutes to grind the false edge.

Happy to answer any question you might have:thumbup:

Fred




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Fred,

You sure do have a steady hand for an old timer...hehe Joke messing with ya buddy.

Great video. You know I am down for one just as soon as I get my act together.

Thanks for the latest video, Fred!!!

Chris
 
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I made some false edges with my bubble jig and they look so strait and even, I still can't believe that "I" ground those.(with the help of the bubble jig of course)
 
Thats awesome, Frank. I cant wait to try the bubbler. I have a clamp from, Fred. But I am sold on this jig. Sure would help a guy like me out for ahwile!

panch0 said:
I made some false edges with my bubble jig and they look so strait and even, I still can't believe that "I" ground those.(with the help of the bubble jig of course)
Click to expand...
 
Here are a couple that I did a couple of weeks ago. These are my third and fouth attempt at doing this.

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Those look great Frank! I can do them...but the ease of it using the jig looks like it would help a bit and save some frustration. :thumbup:

Keep up the good work bud.

Chris

panch0 said:
Here are a couple that I did a couple of weeks ago. These are my third and fouth attempt at doing this.

picture.php
Click to expand...
 
panch0 said:
Here are a couple that I did a couple of weeks ago. These are my third and fouth attempt at doing this.

picture.php
Click to expand...

Those look good. Even with the jig it takes a steady hand. The big work rest that you see in the video is a real help to the stability challenged.:)
 
Fred how do you go about determining the degree of approaches for these different grinds? Is it just a guess?
 
Fletch Helical said:
Fred how do you go about determining the degree of approaches for these different grinds? Is it just a guess?
Click to expand...

In the beginning its a guess. If I get the results that I am looking for then I refine it. Once the grind comes out the way I want it to; it goes down on paper for further reference.

As to your pm question: What is stated above applies here also. Experiment and you will find numerous ways the jig can be put to use.

I have a friend who does all his full tang tapers using the jig. He tells me he has made a sheet up with all the different grinds that he uses and the angles to set in the bubble.

Let me know how your pry bar comes out.

By the way I use it to sharpen my lawn mower blades. :)

Fred
 
Thanks for the video Fred.

I'm going out to the grinder in a minute or two. I've got two 6" blades I've decided to put a swedge on. I've yet to grind an actual false edge. I've been using the jig to more or less knock the corners off the back of the spine. Then during hand sanding I'll sand the lines out and try to fade the swedge into the blade. The jig really keeps things even, as mentioned above, I too am surprised how straight I can keep everything.

Looking forward to the sharpening video. This is where I have problems. I can't keep a straight grind line around the belly of a blade. I've gotten knives sharper than anyone I've bought or owned using the jig though. The lines around the curve just aren't as straight as I would like. Maybe some pointers on this matter in the sharpening video?

Rock on Fred!
 
wingchun74 said:
Thanks for the video Fred.

I'm going out to the grinder in a minute or two. I've got two 6" blades I've decided to put a swedge on. I've yet to grind an actual false edge. I've been using the jig to more or less knock the corners off the back of the spine. Then during hand sanding I'll sand the lines out and try to fade the swedge into the blade. The jig really keeps things even, as mentioned above, I too am surprised how straight I can keep everything.

Looking forward to the sharpening video. This is where I have problems. I can't keep a straight grind line around the belly of a blade. I've gotten knives sharper than anyone I've bought or owned using the jig though. The lines around the curve just aren't as straight as I would like. Maybe some pointers on this matter in the sharpening video?

Rock on Fred!
Click to expand...

Let us know how the false edge comes out. A steady rest helps a lot to keep it all even.

It will be a week or ten days on the sharpening video. Thanks for your input; it helps me when I try to get the best content into the video.

Regards, Fred
 
For those who have not had the chance to check this out. BTTT.

Happy grinding, Fred
 
One last time for the weekenders.

Have a good week folks, Fred
 
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