Plow disc re-uses? I used a notched edge one for a (short) fan base. I had acquired some serious blowing, 2 ft diam, gable fans.
A couple ft of electrical conduit with one end hammered flat and the pivot bolt hole drilled through it. Remember to keep this rig kinda short so that it doesn't tip over while running.
grabbed an old notched edge plow disc and welded the aforementioned conduit, standing up in the center. Three pieces of some sort of 1/4" rods from a display rack were welded on for diagonal bracing between the conduit and the disc/base.
Grabbed a bellville washer and stuff for the pivot point nut & bolt.
The belleville washer lets you have a bit of a friction setup for leaving the bolt just a loose enough to let you tilt the fan head a bit as desired.
Reason I used a notched disc for the base? The full round ones will sit and vibrate on a concrete floor.
Anyone remember having to tie a couple pieces of wire or tape around those big Dayton shop fans with the round ring base, to stop the rattling and tendency to "walk".
