Machining a Mini Tesla Turbine from Cardboard

Step 17: Cut, Drill & Grind Stop Rings

I included this step as an afterthought to keep bearings securely positioned within retainer plates without using glue (too permanent) or tape (not secure enough). It's extra work, but you will have easy access to the bearings should they need replacing or upgrading in the future.

Cut, drill and grind four, 2" diameter bearing stop rings. The diameter of the rings' center hole should be ~1/8" smaller than each bearing's O.D.