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- Aug 29, 2010
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- 14,018
I stumbled on a way to check the centering of my blade tips. I inadvertently poked the edge of a phone book while doing some final flat sanding after heat treat. A little cartoon lightbulb popped over my head.
I set up the knife on my flat surface pointing at the edge of a phone book, with the tang flat, I rotated and sliced into the phonebook and checked the page number. I flipped the knife sliced again, checked the page and determined the difference. Then counted out that number of pages and measured that with a pair calipers. The individual page number readings were repeatable + or- 1 page each slice. Each page one my phone book is 0.0025", 4 pages = 0.01", obviously phonebooks will vary. In this instance I was 0.015 off center with a tapered tang knife with a 6 3/4" OAL that was ground very thin but unsharpened. I couldn't tell with the naked eye and didn't notice any warp when sharpening. I'm sure this method has been done before (feel free to call me an idiot and tell me this was done with papyrus on a pyramid) and isn't the point of my thread but shared it in case someone finds it handy.
The point of the thread now that I have a measurable way to somewhat accurately check off center is....
How do you measure tip centering in relation to the tang and what is your acceptable realistic tolerance? Is there a simple method that I am missing?
If your claim is zero, how are you measuring this?
Thanks in advance.
I set up the knife on my flat surface pointing at the edge of a phone book, with the tang flat, I rotated and sliced into the phonebook and checked the page number. I flipped the knife sliced again, checked the page and determined the difference. Then counted out that number of pages and measured that with a pair calipers. The individual page number readings were repeatable + or- 1 page each slice. Each page one my phone book is 0.0025", 4 pages = 0.01", obviously phonebooks will vary. In this instance I was 0.015 off center with a tapered tang knife with a 6 3/4" OAL that was ground very thin but unsharpened. I couldn't tell with the naked eye and didn't notice any warp when sharpening. I'm sure this method has been done before (feel free to call me an idiot and tell me this was done with papyrus on a pyramid) and isn't the point of my thread but shared it in case someone finds it handy.
The point of the thread now that I have a measurable way to somewhat accurately check off center is....
How do you measure tip centering in relation to the tang and what is your acceptable realistic tolerance? Is there a simple method that I am missing?
If your claim is zero, how are you measuring this?
Thanks in advance.
