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TOPIC: Problem with low angle adapter

Problem with low angle adapter 4 months 2 weeks ago #17089

  • wickededge
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Gerald,

It could be your angle cube. Try rotating the cube 180 degrees on its vertical axis when you switch stones. You'll have to peek around to the back to check the angle after you switch to the other side. Explained another way, you would have the display of the angle cube facing you when it's on the stone on the right hand side and facing away from you when it's on the stone on the left hand side. On some angle cubes that has been an issue that was observed by Bob Nash from Oldawan.

--Clay
--Clay Allison
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Problem with low angle adapter 4 months 2 weeks ago #17091

  • EamonMcGowan
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Clay,
How in the world do ever remember all this stuff? :S It's a good thing a smart guy is running the company! :cheer:
The definition of insanity is to do the same thing over and over again and expect a different result?
An old Irish toast, May the wind always be at your back, may you always have work and may you be in heaven a half hour before the devil knows your dead. Cheers!
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Problem with low angle adapter 4 months 2 weeks ago #17092

  • drichardjackson
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If you take the moving jaw off and put the cube on the stationary jaw between the top vice screw hole and the bottom vice screw hole what do you read? Please take a picture of where you zero it and the reading on the stationary jaw.
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Problem with low angle adapter 4 months 2 weeks ago #17093

  • gwelsby
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Clay,
thanks for the reply but that's not it. I get the principle - the cube is always leaning to its left so it removes any difference when it leans to its right. Right here I'm not trying to measure the angle of the stones but checking the verticality of the blade in the vice. I'm measuring (in this case) a lean of 2.1 degrees to the left when the cube is on the right side of the blade as I look at it, leaning to its left. On the left side of the blade it's leaning 0.5 degrees to the left. If I flip it 180 degrees it reads 0.6 degrees. So the knife is inclined 1.3 degrees from the vertical in the vice. That means that when the cube is showing 12 degrees on either side on the stones I'm really getting 13.3 and 10.7 degrees. Can I just accept that the blade is tilted and add/subtract 1.3 degrees to/from the right and left sides or is the geometry more complex than that?
Regards,
Gerald.
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Problem with low angle adapter 4 months 2 weeks ago #17094

  • gwelsby
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Richard,
see the attached. The cube is zeroed on the granite plate. It reads 0.35-0.40 on the static jaw. Using the granite as a surface plate the moveable jaw is flat apart from the metal opposing the bottom screw.
Gerald.
photo4.jpg


photo5.jpg


Btw guys, thanks for all your help but it's 3.50am here so I'm calling it a night!
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Problem with low angle adapter 4 months 1 week ago #17106

  • EamonMcGowan
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I'm curious ( I swear I'm not being a jerk) did the knife get sharp or was the geometry off and not able to apex the edge?
The definition of insanity is to do the same thing over and over again and expect a different result?
An old Irish toast, May the wind always be at your back, may you always have work and may you be in heaven a half hour before the devil knows your dead. Cheers!
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Problem with low angle adapter 4 months 1 week ago #17107

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gwelsby wrote:
Clay,
thanks for the reply but that's not it. I get the principle - the cube is always leaning to its left so it removes any difference when it leans to its right. Right here I'm not trying to measure the angle of the stones but checking the verticality of the blade in the vice. I'm measuring (in this case) a lean of 2.1 degrees to the left when the cube is on the right side of the blade as I look at it, leaning to its left. On the left side of the blade it's leaning 0.5 degrees to the left. If I flip it 180 degrees it reads 0.6 degrees. So the knife is inclined 1.3 degrees from the vertical in the vice. That means that when the cube is showing 12 degrees on either side on the stones I'm really getting 13.3 and 10.7 degrees. Can I just accept that the blade is tilted and add/subtract 1.3 degrees to/from the right and left sides or is the geometry more complex than that?
Regards,
Gerald.

You can absolutely do this with no worries... I have done it myself several times =)

But there is one thing that no one has mentioned in this thread yet... take the knife out of your vise and take the screws out. put the vise all the way together... do you have a gap at the top? it should be flat all the way to the tip of the vise. sometimes the vise bends at the top which can cause these kind of issues.
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Problem with low angle adapter 4 months 1 week ago #17110

  • gwelsby
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Eamon,
I've done several knives. They've all been sharp. What I was consistently finding when sharpening 50/50 was that the left hand stone would not raise a burr when the right stone would. In one case five passes of the left stone would not even remove the burr left by the right! Yesterday I did two Tojiro Senkou chef's knives. Tojiro apparently factory grind their knives 60/40 so I did the maths and tried that. The bevels didn't look 60/40 but both knives shaved my arm and shaved printer paper.
All the best,
Gerald.
Last Edit: 4 months 1 week ago by gwelsby. Reason: Bad grammar
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Problem with low angle adapter 4 months 1 week ago #17111

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Josh,
this is becoming a bit of a PITA. If I do what I thought was the correct maths and sharpen 50/50 I still get an uneven bevel. What I have to do is to estimate the difference between the angles and see how much magic marker gets taken off on each side, then readjust. Even then I don't get exactly even bevels.
Regarding the vice, if I do as you suggest I can run a fingernail along the groove between the jaws at the top but cannot push a nail into any gap. I can, however, see a tiny chink of light between the jaws lower down. If I HAVE bent a jaw should I take the whole thing apart and sand the bent one flat again? I should think it would have to be the static one as I cannot get the moving one to rock when put flat on the granite.
Btw, can you explain to me how it is that when I have visibly removed metal right to the edge on both sides the I cannot raise a burr on the left side when one or two strokes with the right gives a substantial burr?
TIA,
Gerald.
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Problem with low angle adapter 4 months 1 week ago #17112

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gwelsby wrote:
Josh,
this is becoming a bit of a PITA. If I do what I thought was the correct maths and sharpen 50/50 I still get an uneven bevel. What I have to do is to estimate the difference between the angles and see how much magic marker gets taken off on each side, then readjust. Even then I don't get exactly even bevels.
Regarding the vice, if I do as you suggest I can run a fingernail along the groove between the jaws at the top but cannot push a nail into any gap. I can, however, see a tiny chink of light between the jaws lower down. If I HAVE bent a jaw should I take the whole thing apart and sand the bent one flat again? I should think it would have to be the static one as I cannot get the moving one to rock when put flat on the granite.
Btw, can you explain to me how it is that when I have visibly removed metal right to the edge on both sides the I cannot raise a burr on the left side when one or two strokes with the right gives a substantial burr?
TIA,
Gerald.

I think your main vise is bent and/or possibly your LAA vise is bent... take some pics and post them if you can. If so WE will replace them, just get w/ Clay or Kyle.

Sure, I can explain it to you about the burr on one side but not the other ;) it happens to me quite frequently. Hopefully these pictures will explain. In the second one you will notice a little curl at the very edge... this signifies a burr. You may be grinded to an "apex" on one side but haven't fully reached it on the other. The black lines signify your stones. Understand? =) Hope this helps!


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