Eth, I wish you had shown us that the sanding of the shaft to clean it (prior to putting it into the freezer) was not the the reason the bearing slipped onto the shaft after it came out of the freezer. I don’t doubt you but it would have eliminated the sanding as a possible source of the fix.
I'm dealing with the same problem yet mines only ~.03mm and the bearing slides freely on the shaft. Here are some solutions I have found. If there's a better solution, let us know!!! ***#3 is considered the best solution*** 1. Loctite makes several retaining compound products (603, 609, 638, 660, etc). The largest gap they would fill is the 660 @ .5mm. (Don't forget to use primer/activator on certain metals) 2. Dimpling the surface using a spring punch (creating an even pattern around the shaft where the bearing will sit) may work depending on the gap and loads on the bearing. Also heard a knurling will create the same effect. (smaller gap=better result I assume) 3. You can buy a sleeve but this will most likely entail machining down the shaft to fit the sleeve. 4. Weld that S.O.A.B. !!!! lol (Obviously the nuclear option)
I tried it, didn't work I had to use file and burr plus sanding of inner side of bearing block to make it fit, I guess not all shaft respond to temperature too largely
While I have done things like that in the past a well. It's always best to fit the shaft to the bearing. The reason being is bearings are often very consist in dimensions, so if you polish the shaft, every bearing off the shelf will fit. As opposed to having to sand and polish every bearing to fit the shaft with any future replacement. I also never use any sort of power tool to polish shafts. I use files to remove high spots from dings, dents and scratches, then emery cloth to polish. I use a large file to find hard to see and feel high spots
