help me figure out an angle

T

Talley1013

Joined
Oct 15, 2010
Messages
414
Hey guys I'm sure some of you will laugh @ this but I have to ask anyway. If I were to use the thumb stud on my griptilian as a guide while sharpening, what would the angle be? I know I could measure or calculate the angle but geometry always made my head hurt. I was thinking maybe someone had already put some thought into this and would know off the top of their head. I know it will be pretty low but was thinking I could use the thumb stud as a reference point while sharpening. Thanks guys

ET
 
The stud is probably softer than the blade. If so your guide would wear faster than the blade....
 
I assume he meant holding the spine up from the stone just enough so that the stone doesn't touch the studs. Which is a fine method, just that it might get a little more inconsistent the further you get from the tang. I personally don't feel there's a real need to know the precise angle. On the griptilian, you'll probably want a low angle, and it won't get any lower than where the thumbstud is unless you remove it prior to sharpening.
 
usually the EP hits thumbstuds around the 15° mark. it was the case with a bench 930 kulgera and a bit under 15° iirc on a ritter grip.
 
sorry I should have clarified. I would not drag he thumb stud on the stone. It would be used as a reference point to start from with the stud being lifted off the stone the same amount on each side
Noctis- I agree that knowing the precise angle isn't really important. Consistency is far more important. I was thinking that starting from a spot close to the general angle that I was looking for would help me be more consistent and help with developing muscle memory.
Pwet-That is about what I was thinking. I thought it would be around 10-15.
 
You're not going to get away from the geometry. I go here.

http://www.carbidedepot.com/formulas-trigright.asp

Measure the width of the blade at the thumbstud and enter that as side C. Measure from the center of the spine to the tip of the thumbstud and enter that as side A. Do yourself a favor and use milimeters...it is way easier. Hit calculate, and that will tell you what angle your thumbstud gives you. So if your thumstud is about 8mm high (from the center of the spine) and your blade is about 30mm wide at the thumbstud, you're going to get about 15.5 degrees or 31 degrees inclusive. I don't have your knife but I think these are about what you'd experience.

I do the reverse when I repofile. I enter the width of the blade as side C. I enter 15 as my angle in angle A and that gives me how high to hold the center of the spine off the stone to achieve the desired angle. I take a paper clip, bend it around, and clip it so I have a little post that sits on the stone and is usually about 8mm tall. I use that as a visual guide which has turned out to be real easy to follow...muscle memory does most of the work.
 
Thanks Hoosier. I will check out the link. I like your trick with the paper clip. I will be trying that out whe I get home tonight

ET
 
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