I built a tool grinder a LONG time ago to grind cutters at 14 1/2 degree (acme thread) to cut teeth in a rack with the shaper, Intended to make other attachments but this is the first in about 6 years,
A lot of web surfing gave me a few ideas that I blatantly stole and combined to this.
First is a jig to align and position the drill bit in the holder. There is a finger on the far side of the angle iron, the flute it held against it and slid back and forth till the cutting edge is horizontal, then the stop is set behind the bit.
The plate at the front swivels to the angle of the bit and has horizontal lines scribed to align the bit to.
The holder rests in this v-block. the cutting angle can be swung to what ever, here its set to half of 118 degrees and the clearance angle set at the bottom, here at 8 degrees.
There is a screw under the holder that sets the depth of cut. The whole thing swings back and forth over the face of the wheel.
Spark out on the first edge flip the bit and spark out on the other and you have two equal cutting edges.
This is a 1 3/8 bit, needed a lot of grinding to get it back to this after many free hand sharpening's.
The back clearance for the 4 facet grind was done by hand but could be done on this by increasing the clearance angle.
Guess made another attachment as well. The wheel needed dressed, I've been holding the diamond in the other work head but built a proper dresser for it.
As a side note, ordered some wrinkle finish powder coat and gave it a try here, like the texture.
Greg