That's a very creative grinder @Huub Buis . You should document it (if you haven't).The 2 tools on the right, 80° L/R turning tools, only need a grind at the front to keep them sharp. For a better finish, you could round the tip by grinding it one pass, very,very,very lightly. That should give a small tool nose radius (you absolutely need a very small radius on a light weight lathe) for a better finish. You will probably over do this and grind a to large radius. I grind mine to a 0.02 to 0.04 mm radius.
For easy grinding, I use stackable jigs to keep the grinding angles always the same. Using the jigs, I can regrind my tools in seconds.
The 2 jigs in the picture give a combined angle of 6° and 60° to grind a metric external threading tool. The 6° base is used for all external HSS tools.
The stone is a €7 "diamond" disk that lasts several years. On the back a stepper motor that runs at 1000 RPM. The long square steel bars functions as rail to move the tool in 2 directions. The short steel square bar is used to keep the 2 jigs aligned together.
View attachment 467435
GsT