Flutterby™! : Axial loads

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Axial loads

2010-01-14 21:27:41.359619+00 by Dan Lyke 3 comments

I recently bought a shload of 608ZZ bearings for a project that's gotten postponed because I now have the milling machine. One of the projects Charlene and I have been talking about is a lift for a piece at the head of the bed that'd serve as a retractable bookshelf/whatnot. Today, VXB.com sent me a "get a free set of digital calipers with an order of $20 or more, so I went and browsed through their thrust bearings and decided that a set of $8 calipers wasn't worth speindg $30 on those bearings pre-emptively, but it did get me searching around, and apparently my Google-fu is lacking.

Anyone got an idea on how I'd figure a reasonable working axial load for a 608ZZ bearing?

[ related topics: Fabrication Furniture ]

comments in descending chronological order (reverse):

#Comment Re: made: 2010-01-15 13:20:31.444178+00 by: meuon

What!?! no pneumatic air-rams with a biofeedback controlled oscillation mode?

Worth knowing: At the industrial hardware nuts and bolts places, you can by threaded rod in various grades besides the floppy coat hanger grade steel the common hardware store carry.

#Comment Re: made: 2010-01-14 22:44:05.704174+00 by: Dan Lyke

I've got a hundred of the puppies, I guess it's just to get some 5/16" threaded rod and build a stand.

I was thinking of implementing the lift with 4 threaded rods driven with a cogged belt or a chain (bike or motorcycle), probably using a drill for the motor (cheap, relatively high torque, with speed control and reverse built in). But by the time I get there I'll probably just spring for the thirty bucks for some good thrust bearings.

#Comment Re: made: 2010-01-14 22:17:15.114552+00 by: meuon

Buy one. Progressively load it until it binds.. and more until it breaks.

the spec says 'deep groove' but it's a shallow small high speed bearing, it's not made for high loads.

Nancy would love it if I finished making the headboard for our bed.. we'll have to compare notes. I was looking at using a modified 19" rack slide...