WillR wrote:
J. Clarke wrote:

lid wrote:


On Tue, 12 Apr 2005 05:50:57 -0500, Prometheus
wrote:


My kitchen cabinets have magnets
holding the doors closed- and they were built at least 50 years ago,
judging from the hardware.


I guess along with reasoning, reading isn't your strong suit.



You know, you'd have a lot more fun if you weren't spring-loaded in the
****ed-off position.


John:

I'm curious -- what did you calculate as the side force on the bearing
-- worst case (edge load of 100lb. -- c.o.g. at platform level -- point
mass -- 150 rpm -- 24" disk -- assuming no vibration due to imbalance
i.e. simplest case).

I didn't. I took it as a point mass on the rim secured by friction with
a 1.5 safety factor and got 24 RPM before it falls off and stopped there
until I got confirmation that 24 RPM was sufficient. That was giving 20
pounds lateral load, friction-limited, neglecting any unbalance in the
table itself--I didn't look at the moment.

You seem to be a mech. eng. my specialty is elsewhere -- so not sure I
remember all the stuff I should take into account especially once I
looked at a bit of vibration all bets seemed to be off :-) . (I had to
grab one of my mech eng. books to remind myself of the factors... at
least you can see electrons unlike this mechanical stuff. LOL)

It's been so long since I've actually done ME (computers bit me hard)
that I'd have to dig out the references before I got much deeper into this.

I ask because my quick calculations gave me a higher figure than the
rating of the hub suggested. Not sure there is any safety factor there,
not even sure that the hub suggested is within "required" spec.

Thanks for the thoughts -- even if you don't reply... :-))




--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)