These are pics of a simple grinding bed/jig that I knocked up to shape and sharpen my HSS bits for my metal lathe. The bed is set at 8 deg to the horizontal. Seemed to be an acceptable compromise to cover most uses. The mitre can be adjusted to suit the other required angles. I have scribed the most used angles into the bed for quick setting. I know that this may not be the absolute correct way to do it, but it works well enough for me. This is made from aluminium, but could just as easily be from wood. So maybe someone can get some use from it.
I don't bother with the mitre to re-sharpen
This is the underside of the mitre

I don't bother with the mitre to re-sharpen
This is the underside of the mitre