Sharpening handbook - people might find this interesting

Thanks for posting that Francis, I use the 40/40 and also a cross between the fingernail and Elsworth grind. at 55° for my bowl gouges.

N.B. I have been learning about the confusion between English English and American English if I state any bowl gouge sizes they are in English English, i.e. measured across the flute! That has been causing a lot of confusion lately!

For the 40/40 see my video on YouTube youtu.be/FAubzqNTc9s I simply drill another stop at 40° and colour in the table corners as my guide. Note this grind requires a parabolic flute as found on Robert Sorby bowl gouges. I first tried this when I wore out a 3/8" gouge to the point it didn't fit the jigs anymore so hand sharpening and playing with different grind options became a thing, I now have a new 3/8" and 1/2" set to 40/40 as I liked it, this also requires a traditional (ish) grind 60° "bottom feeder" as 40/40 is great at cutting in, not so good at cutting across.

My 55° grind is achieved by periodically removing all guides laying the top of the flute almost flat on the belt then raising the handle to just round off the tops of the bevel a little as it joins the wing. then I simply use the ProSet at 45° and use the 3rd hole on the Long Grind Jig adding the extra 10° 

Bottom line is you find a grind that suits you, then you find the easiest way to replicate it so you don't have to relearn tools each time you sharpen. 

I am looking forward to wearing out another bowl gouge Emma Cook has an interesting style of grind with a swept back wing on the left, combined with an almost traditional on the right... will be giving that a try one day!