For a swap from motors with a 5/8" keyed shaft, mounted with 4 bolts on a 75mm circle, to NEMA34 motors with a 14mm shaft with two flats - I need some shaft adapter/extenders. The adapter plates I had made are almost 1/2" thick. Have to be since bolts thread into them from both sides.
Dunno why the old shafts were 5/8" on a mill made in Taiwan with motors made in the UK.
I have found a few ready made parts like these, with many different sizes on both ends, but of course not a one with the combination I need.