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Asymmetric Knife Bevels with SVM-45

Started by gwagner, January 02, 2022, 06:06:18 PM

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gwagner

For knives where the spine is thicker than about 2-3 mm, the center axis of the knife blade is not in line with the center axis of the SVM-45 jig shaft, resulting in asymmetric bevels.

How do you avoid this? (I don't want to have to reset the angle for each side of the knife.)

Scotty

I have been battling this issue, especially with Japanese single bevel (concave back) knives.
I have had some moderate success using small popsicle sticks under the leading edge of the jig.
A PIA to clamp, but seems to work well.
Multiple layers of tape and or washers (shims) also work.
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Quote from: gwagner on January 02, 2022, 06:06:18 PM
For knives where the spine is thicker than about 2-3 mm, the center axis of the knife blade is not in line with the center axis of the SVM-45 jig shaft, resulting in asymmetric bevels.

How do you avoid this? (I don't want to have to reset the angle for each side of the knife.)

One option (that I haven't done myself) is to thin the inside of the jig, described here:

https://forum.tormek.com/index.php?topic=2962.0

A forum member posted this solution (also haven't tried)...

https://forum.tormek.com/index.php?topic=3249.0

Schleifjunkies sells a "self centering" jig (his website is currently down, but should be back in a few days)...

https://schleifjunkies.de/?lang=en


I'lve had success using a Lansky jig that "self centers"....

https://forum.tormek.com/index.php?topic=3792.0

... I've also used a KME jig, seen in this post...

https://forum.tormek.com/index.php?topic=3459.msg21645#msg21645

... as you can see, you're not alone here. ;)

Quote from: Scotty on January 02, 2022, 06:34:44 PM
I have been battling this issue, especially with Japanese single bevel (concave back) knives.
I have had some moderate success using small popsicle sticks under the leading edge of the jig.
A PIA to clamp, but seems to work well.
Multiple layers of tape and or washers (shims) also work.

Probably works for your example, but you can't shim a blade that is too thick for the SVM-45... it's already off center and a shim makes it worse.
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