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str8 knife edge angles are inclusive hence 40 degrees if it was a chisel it would be 20 degrees,the biggest problem with learning how to sharpen is over thinking it and it's very easy to use...

your missing out on a vital part of your apprenticeship by not learning how to sharpen a knife freehand as not all shops will have a sharpening system so then you can get the knife sharpen bloke to...

Sharpening aids come and go if they were as good as they say everyone would use them ask anyone who uses knives to make a living and most will tell you a good stone is the best way to sharpen guess...