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Rotating monitor construction *Project finished*
Cornchip:
Skateboard axle's are an industry standard 8mm (should be). The threads on a 8mm bolt will measure slightly less than a perfect 8mm (.315) giving that loose fit.
DaOld Man:
Ok thanks..
I used a 8 mm shoulder bolt, the shoulder should be a scant larger than the thread area, but even on the shoulder the bearing has a bit of play.
What size bolt did you use on your project?
Franco B:
The thread OD prior to screwcutting/threading wants to be about 7.95mm or there abouts.
If you want any bolts etc made to some custom dimensions just give me a shout and I would be happy to help (no charge).
Cornchip:
I used 4 shoulder bolts (1/2" dia x 3/4 lg). I didn't use bearings inside the roller wheels. Instead I used a plastic called UHMW that is classified as a low speed bearing material. I didn't use a metal lower roller due to the noise that it probably would have created with metal to metal contact (the monitor disk is made from 1/4" Aluminum x 28" in dia). Rubber would have flat spotted with the small contact area between the monitor disk and the roller (wouldn't want to get my finger pinched there!). The UHMW has held up great thus far.
The only bearing in my assembly is a pillow block bearing at the rear. That bearing is for the drive gear and controls the monitors position front to back in the cabinet. The rollers (at the front) only control the monitor wheel centering acting only on it's diameter....not the front or rear faces on the monitor disk. The rollers have a radius groove cut into the outside diameter that the wheel rides in.
I found a picture I might not have posted before. It doesn't clearly show the rollers up close, but does show the front portion of the setup with the rollers mounted.
Cornchip.
Edit...found a better picture as seen from the back. :)
DaOld Man:
--- Quote from: Franco B on March 29, 2008, 06:11:29 pm ---If you want any bolts etc made to some custom dimensions just give me a shout and I would be happy to help (no charge).
--- End quote ---
Thanks Franco B!!
That is a very generous offer.
I may holler at you soon.
I have playing with this bearing at work, and I think 5/16" or 8 mm shoulder bolts will probably work, maybe I just need to lower my toloerances a little.
But I wont be able to use the all thread idea I originally had.
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