Derek
If you just want to sharpen standard point drills the actual construction of a replica Clarkson drill grinding attachment could be somewhat simplified for home construction. It’s really only question of extracting the appropriate angles and offsets.
I’ve had an enlarged version for sharpening drills put around 1 1/4″ on the round-tu-it list for several years now but have gotten no further than buying the 6 jaw chuck due to more urgent needs.
Appropriately sized 6 jaw chucks with long type jaws can be gotten at acceptable prices from the import suppliers so it’s just a question of finding someone with 3D expertise to do the drawings. trying too do it in 2D its quite difficult to figure out the angles and offsets as the originate in free space.
I really should take another look.
Clive