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I am about to start on my journey with a new lathe, and need to make some gravers. I ordered the steel to make them and the sharpening stones etc. and planned on making a 45 degree, 20 degree and 30 degree tools to get me started. Luckily I snagged a graver sharpening tool in a recent tool job lot buy so I'm off to a good start. I was pondering how I could get the correct angle for the sharpening process and pictured myself trying to balance everything and try to read a protractor and thought there must be a better way.... here is what I came up with: So all I have to do now is put in the dimensions of my graver and graver sharpening tool (should only have to do once) and the angle I want, and the sheet will tell me the distance (L) from the tip of the top of the diamond to the front face of the graver sharpening tool, so in the example above (fake graver sharpening tool dimensions) if I want a 30 degree angle on the graver I need to have 95.162mm of graver sticking out, then file file away! Turns out my maths teachers were correct, I will use trigonometry every day! Can't upload the excel sheet here but can send it to you if you want it, just pm me with your email. PS Just realised that the model only works for square gravers ie a = b on above drawing - head is hurting from the maths to make it work for non-square tools also. Model also assumes that the angle where the graver enters the graver sharpening tool is 90 degrees.