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calan
sage
Reged: 06/16/07
Posts: 457
Loc: Oklahoma City, OK
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Re: Lazy Susan For Intelliscope
05/23/08 08:01 PM
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Wow... I just posted about this in another thread. Should of known I wasn't onto something original 
I used the standard Lazy Susan bearing, lubed with some silicon spray. Adjusting the amount of "freedom" is simple; Place a nylon spacer and/or washer on the center shaft so that it that sits about 1/64" below the top of bearing (use a straight-edge across it). You want the spacer to be barely below the base (about 1/64"). Then put a big fender washer under the lock nut on top of the base to help spread out the nut's clamping force a bit.
You can then slightly tighten the lock nut (and thus transfer friction from the nut/shaft to the base) to get any amount of drag you desire. If you keep tightening, you will begin to tighten the base down onto the spacer, producing even more drag without crushing the bearing or cracking the base. I can adjust mine from extremely free spinning to almost locked down.
Edit:
I just checked the links and the "doitbest" version is the one I've had kicking around in my garage for years and the one that I used.
BTW - These things are rated at 1000 lbs, and the load is spread out over many ball bearings. Unless it is severely over-loaded, abused, or defective, I can't see it developing flat spots any time soon. Time will tell though 
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