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TOPIC: Problem with low angle adapter

Problem with low angle adapter 4 months 6 days ago #17057

  • gwelsby
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Not sure if this is the best place to put this, but as I AM getting started...
Being unable to get a low enough angle on my Japanese paring knives I acquired a low angle adapter. It arrived just as I was setting off to visit friends with my WE. I put the adapter in my pocket and set off. When I got home my wife had binned the instructions but it looked pretty self-evident to me.
I wanted to put a 12 degree (24 inclusive) bevel on one knife and a 13 degree bevel with 15 degree micro bevel on the other. I started with the 13 degree. The bottom screw was proud at that angle so it was off to the Dremel. Now here's the problem. When I got to the stage of raising a burr there was nothing when sharpening the left side of the blade. I would do 5 passes on the left, with no result, when 2 gentle passes on the right would raise a significant burr. Also I was removing more metal from the tip of the left side than the right. I persevered and got a really sharp edge, then moved on to the next knife. I noticed immediately that I was again removing more metal from the left side. I tried measuring the angle of the blade to the vertical. It was difficult as the blade is so narrow, but it seemed to be canted 1.5 to 2 degrees to the left. I replaced the knife with a big chef's knife and found it again canted 1.2 degrees to the left. I assume that this explains the burr problem above. What am I doing wrong?
TIA,
Gerald.
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Re:Problem with low angle adapter 4 months 6 days ago #17061

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We'll I'm a newbie but I may have the answer. Most kitchen knives are full flat ground (FFG) which means the primary bevel is a constant angle that extends from the spine to the edge. So you basically have a very acute V shaped piece of metal between two jaws that are more or less parallel. This will allow the blade to cant to one side or the other unless you have absolutely mastered keeping it centered. Most people use a piece of leather or chamois or foam between the blade and the jaws on FFG blades to give it some more support below the spine to ward off the cant.


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Re:Problem with low angle adapter 4 months 6 days ago #17066

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Richard,
thanks for that. It sounds like an explanation. As an experiment I applied a clockwise torque to the knife while tightening the vice. It did ameliorate but not solve the problem.
Can someone with a low angle adapter please let me have the instructions for its use? I just dropped it into the main vice and tightened. I measured some angles today. My riser is inclined at 0.3 degrees to the left. The non-moving vertical part of the adapter is angled at 1.0-1.1 degrees to the left. Are these normal/within spec?
TIA,
Gerald.
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Re:Problem with low angle adapter 4 months 6 days ago #17067

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What are you measuring angles with and where? Are you measuring on the inside of the low angle adapter vice? Just FYI, the main vice will have exactly the same issue you described in your first post(the cant) if you don't use the leather, foam, or chamois with a FFG blade.
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Re:Problem with low angle adapter 4 months 5 days ago #17074

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Thanks again Richard. I am using the angle measurer which comes with the Pro 2 kit. I put it on the flat top of the riser to get the .30 degrees. You are entirely right - I tried the main vice with a big Tojiro Senkou chef's knife (no chamois) and got the same result. The knife is not exactly as you describe. It tapers from the shoulder down to the bevel which then is more obtuse at 12.5 degrees but this latter would not make any difference as it's not touched by the vice. I've tried with and without chamois but it's the same either way. Is there a technique for getting the knife perfectly vertical?
Thanks again for your help - much appreciated.
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Re:Problem with low angle adapter 4 months 5 days ago #17076

  • razoredgeknives
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Are you using an angle cube?

Josh
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Re:Problem with low angle adapter 4 months 5 days ago #17079

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Josh,
yes, that's the name I was looking for!
Gerald.
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Re:Problem with low angle adapter 4 months 5 days ago #17081

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Can you post pictures of the knife? I'm wondering if the primary grind has any effect here

Josh
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Re:Problem with low angle adapter 4 months 4 days ago #17087

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Josh,
when I looked at the Japanese chef's knife I saw that the primary grind was not symmetrical. However, I tried again with a simple Victorinox chef's knife which has nothing strange about it. Here are the photos. Note that on both sides of the blade the Angle Cube is showing inclination to the left.
G.
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Re:Problem with low angle adapter 4 months 4 days ago #17088

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Josh,
so doing the maths it looks like:
Angle of cant plus angle of taper of blade shoulder to edge = 2.1 degrees
Angle of cant minus angle of taper = 0.5 degrees
Angle of cant = 1.3 degrees
Angle of taper = 0.8 degrees.

Any explanation?
TIA,
Gerald.
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