Thank you for this instructive response Nick!.
My comparison also fails, because a knife is not hollow, as you explained very clearly.
I am also going to study your link
Wim
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Show posts MenuQuote from: GKC on April 18, 2022, 03:36:52 AM
Here is a link to one of his videos, in which he propounds a theory in support of the superior toughness of a convex edge.
https://www.youtube.com/watch?v=XA5AM2Lb0iY&ab_channel=virtuovice
Quote from: Ken S on September 15, 2022, 03:58:29 PM
" I want to use a jig for honing because the freehand method is too erratic and imprecise."
I have personally observed an expert Tormek sharpener precisely hone knives and chisels freehand, as well as watching Wolfgang do the same in the online class videos. Their skill did not happen overnight. I am not opposed to using FVBs; I have actually purchased two of them. (They have other uses in set ups.) However, I believe you short circuit your sharpening if you do not master freehand honing.
Ken
Quote from: Ken S on September 09, 2022, 04:07:17 AM
Martin,
I really enjoy situations where everybody wins, everyone benefits. Your happy situation is certainly one of them. The students and school benefitted; you as both sharpener and teacher benefitted. And, the walnut table you will build will be a happy reminder of this enjoyable time.
Well done!
Ken
Quote from: RichColvin on September 02, 2022, 12:44:13 AM
Adam,
I am a fan of precision, not accuracy (https://www.diffen.com/difference/Accuracy_vs_Precision). The Tormek is an excellent tool for repeatability and that is far more important to me as I resharpen often.
In his review of Simon Winchester's The Perfectionists: How Precision Engineers Created the Modern World, James Gleick writes for the New York Review of Books... precision involves an ideal of meticulousness and consistency, while accuracy implies real-world truth. When a sharpshooter fires at a target, if the bullets strike close together—clustered, rather than spread out—that is precise shooting. But the shots are only accurate if they hit the bull's eye. A clock is precise when it marks the seconds exactly and unvaryingly but may still be inaccurate if it shows the wrong time.
To me, the exactness of an angle is less important than that is always the same and I can count on that.
Rich
Quote from: Ken S on August 31, 2022, 04:27:43 PM
Wim,
Bravo! You are on the right track. I have never understood the reasoning for using the frame as the measuring reference point instead of measuring directly from the wheel. Guided by Dutchman's grinding angles booklet, I have used Dutchman's direct to the wheel method for eight years with my kenjig. No compensation is needed when switching from the T7 to the T8. Using Dutchman's tables with diameter changes, the direct measuring with kenjig works with no modification with the T4.
Borrowing Wim's depth gage idea, the kenjig could be modified to eliminate the need to purchase a depth gage. Shorten the slot to around one inch. Mark the kenjig with the Distance. You will need to make up several kenjigs with different Distances.
With the KJ-45, there is easily a range of 10mm. Using CB's Calcapp, enter Projection values from your widest to your narrowest knives. Note these values and use them to make up kenjigs. These kenjigs will be gage blocks, having the same measurement year in and year out with no need of resetting. The Projection could be adjusted match one of the kenjig Distances.
Kenjig instructions are posted on Rich Colvin's Sharpening Handbook.
Ken
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