J. Clarke wrote:
WillR wrote:

J. Clarke wrote:


wrote:



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


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.




Thanks. I just had a cursory look - but at 150 RPM (since he had
mentioned a motor and 150 RPM in another post) I was a little surprised
at the force on the bearing -- assuming the load was constrained and
didn't fall off... LOL

A little flexing or vibration and it could get interesting. :-)

I had pulled out my ME text and that's why I asked.

Anyway. Not our problem. And not my field.

Best wishes...

--
Will
Occasional Techno-geek