Just treated myself to a set of wood chisels and want to keep them sharp. bought a special protractor ( US Patent 4,766,6750) today but unable to find any instructions on the net.
Anyone know how to use this to check grinding angles?
Unfortunately, patent application a bit hard for me to understand and no diagrams provided or instructions with the protractor. Only cost a couple of dollars.
I have read that chisels should be sharpened to 25 and 30 degrees, on TV tonight Discovery prog quoted 22.5 degrees.
What do you advise.?