MCW July '16 Program
Jul 19, 2016Public
Photo: Our demonstrator for the evening is our own Carl Powell who will be telling us about how cutting edges work and how to sharpen them.
Photo: [words about this book]
Photo: [words about this book]
Photo: This is what you get from tearing, not cutting.
Photo: Carl used this board to highlight the need for a sharp edge...
Photo: ...and showed the improved result on the piece of paper.
Photo: Here is his favorite book on sharpening.
Photo: This handy angle gauge will help you see what you have and guide you to what you wish to have.
Photo: Consider this model to be the cross section of your skew chisel blade.  Different included angles provide very different results in use.  Carl talked about the tradeoffs.
Photo: Here the edge is supported by the bevel and is cutting.
Photo: Here it is not supported, and it is scraping.
Photo: Simulated  tool steel edge off a coarse grinder stone.
Photo: Simulated  tool steel edge off a fine grinder stone or after honing.
Photo: Gary tries to explain "talk to the hand" but got it all wrong.
Photo: The simulated tool will cut with this angle when used straight into the work piece.
Photo: When the tool is turned to an angle, the effective cutting angle of the edge of the tool is smaller (i.e., "sharper").
Photo: We have here an exaggerated concave to show the result of sharpening on a typical, round grinder wheel.
Photo: [words]
Photo: We have here a bench chisel.  [point?]
Photo: And we have here a spindle roughing gouge with a narrow tang.  Do not use this on cross-grain forms such as bowls!  It is very dangerous.
Photo: Moving into sharpening:  Here is one style of jig for sharpening at a bench grinder.
Photo: Speaking of negative-rake scrapers.
Photo: [words]
Photo: Sharpening a skew chisel on a flat piece of sandpaper.  This is a good way to round over the cutting edge and make it worthless if you're not careful and know what you're doing.