After a little thinking, I decided to try and make an adjustable jig, that would hold a knife blade at the correct angle (for whichever grind your knife has), so that it could be ground (or sharpened) on a bench mounted belt sander.
Here are the photos of the early stages of construction, as well as the finished jig. Sadly I didn't start taking photos until I had started...
Three 102mm tee hinges, a 250mm length of 25mm x 200mm and a 200mm length of 25mm x 50mm, redwood PSE (planed square edge)...
Add to that a smallish butt hinge...
Bend the free end of the top tee hinge, add a 125mm-150mm length of M4 threaded bar, fixed with two pairs of nuts (two nuts would work, but I wanted to be 100% sure)...
Then thread a wing nut onto the threaded bar, followed by the butt hinge, and then another wing nut, before fastening the nutt hinge to the base board...
Once I knew it all worked properly, I removed the face plate (the 25mm x 50mm piece) and drilled 5 pairs of holes for some 1/4" x 1" rare earth magnets, glued them in, and finally rebuilt the lot...
The reason I used pairs of magnets, is they seemed to have much more pulling force when doubled up.
The amount of adjustment is more than enough for any of the knives I will be grinding...
No tools are needed to adjust the jig, only an angle measure of some kind, to set it accurately.
Hope you found this thread useful.
Adam