Quote:
Originally Posted by Dennis
Hi Geoff
I love these DIY engineering solutions – terrific article mate!
A bit off-topic, but you’ve got me thinking – would the lazy Susan be strong/smooth enough to be used as the azimuth rotation on a motorised bino seat, with the full weight of the observer, chair, mount and binos?
Cheers
Dennis
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Hi Dennis,
Thanks for your comments.
These 12" diameter bearings are rated for 230Kg axial load without binding, if you apply a little light grease to the ball race. Some data sheets even mention 1000 lbs, or 300 Kg.
They are cheaper as well from
http://www.thewoodsmith.com.au/thewo...projects01.htm
They are not however rated for any sideways load at all. I think the main problem in your application would be stresses on the bearing cage introduced by off-axis loads and tilt, such as when the seat occupant leans forward.
This would have the effect of distorting the sheet-metal bearing housing halves around the securing screws. At worst the balls might escape from their groove, or the sheet-metal be permanently deformed.
So the design problem becomes one of how to limit tilt-type loads at the lazy susan. I think some type of tilt limit stops outboard of the lazy susan bearing would do the job, such as teflon pads on the lower face, shimmed to such a height that they just contact the upper face when the assembly has say 100 Kg central load.
GeoffW1