Hi, I have wheels with two 20mm ID bearings at each end. I also have round rods whose OD are 20mm. The rod seems to be ground, so my caliper shows the OD to be exactly 20mm. Without removing any material, the rod doesn't go in to the bearings. It might go in if I pound on it with a hammer. I want this rod to go into the bearings with a tight fit, just a few light strokes with a hammer should be all that's needed. I tried making the OD of the rod 19.9mm, but that got too loose.
Right now I am thinking of fastening the rod to my lathe and swipe a piece of sandpaper over the rod.
What is the recommended way of handling this?