Problem with low angle adapter
- This topic has 32 replies, 7 voices, and was last updated 04/23/2014 at 4:11 pm by
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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.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!
Np!
I can’t really tell unless it is zoomed out 🙂 it should look similar to this (although mine is made from tool steel)
Josh
Excellent observations, Josh.
But back to the issue of the knife leaning to one side. I have a couple of knives now that present this same problem. Their flat grinds don’t allow the vise to be used normally. Gwelsby is right on about needing to add or subtract the lean angle from the sharpening angle. I know others use a patch of chamois, but I use a patch of coarse paper towel to improve the grip on the blade. My Spyderco Delica in ZDP-189 has the same tilt problem with a total of 3.5 degrees included between the flats. I clamp the blade flat against the left jaw and push the moveable jaw out until it is parallel to the right face of the blade. I then use a 1.75 degree offset, depending on the actual angle I find at the blade flats.
Unfortunately, if you want to match the existing bevels and there are no flats to clamp on, you’ll need to check the blade’s position for tilt in the clamp. And/or resort to the Sharpie method to confirm the angle.
BTW Gwelsby, have you checked to be sure that the blade is not rocking from side to side as you sharpen it? I have to admit having this bite me in the butt. Having been burned once, now when I clamp a blade I check to see that it is clamped securely by trying to rock the blade in both axes.
I totally understand what you are saying TC but you definitely can still use it normally. I just did this para 2 on my wicked edge after regrinding it 🙂 no issues.
Check out my video on clamping… It has always worked great for me…
Was your tool steel vice a lot to have fabricated Josh? It seems to be a great solution to avoid bending a vice I guess you could even have it tapped with bigger threads to allow more torque to the clamp bolts .
Around $130…but you have to find someone willing to do it.
Josh,
well, if you’re using tool steel then the problem is not your vice’s getting bent! A couple of photos with less magnification.There may be minor issues there BUT. The left jaw of the vice is fixed and vertical so WHENEVER a tapered blade is clamped and the left side of the blade is flush against the jaw it will ALWAYS tilt to the left, at the included taper angle of the blade. This does not, of course, explain how I got the left side of the blade leaning to the left, as it should be vertical. Perhaps it may be explained by the use of chamois.
So, the solution SHOULD be: For all blades, make sure the left side is vertical. For FFG blades, just use the angle cube to set the angles. For tapered blades find the included taper angle by lying it flat on the granite and using the angle cube, then do the maths. If you want asymmetric bevels, do some more maths! Oh, and probably use kitchen paper instead of chamois.
Regards,
Gerald.My vise isn’t bent Gerald 🙂 I was showing you what it should look like. My suspicion is that your knife was rocking back and forth as stated above, while you were sharpening maybe? Anyway, glad you got it fixed!
Josh
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