Drill bit sharpener adapter for bench grinder

This is version 1 (test) of the drill grinder attachment. This version allows you to give the drill the basic geometry:
angle 118
symmetry of the blades
undercutting the relief surface
optimal angle between the relief and rake surface
correction of the tip
I used a 3-jaw lathe chuck reduced by 50%, but you can use a steel ER chuck and other solutions to hold the drills https://www.thingiverse.com/thing:4265935