Lazy Susan bearing plus thrust bearing - how much torque?

**coylum** · 23rd August 2016, 08:44 AM

I am going to use a Triangle 12” Lazy Susan bearing to rotate an Audio rack (see picture) which is 500mm square and 1200mm tall. The total weight is around 90Kg and it is slightly top heavy so can wobble a little when revolved. I plan to use a 3” Lazy Susan bearing as a thrust bearing as suggested on the Triangle website:

Triangle Manufacturing - What are Thrust Bearings?

Triangle Manufacturing - How to Install a Thrust Bearing

My question:
How tight should I pull the nut on the coach bolt that connects the revolving surface with the 3”bearing/washer – is it just enough to take up the slack or should it be under some tension?

I have asked this question of Triangle but they came back to me and said that they can't recommend a torgue as every application is different. I understand every application may be different but it seems somewhat unhelpful that they can't give me any advice at all...

My gutfeel is just to nip it up enough to take the slack without applying too much friction to the rotation.

I would appreciate any comments or advice

**Ubernoob** · 23rd August 2016, 09:30 AM

Yes, I would say just tight enough to remove any slop, I'd think too much preload would distort the pressed steel pretty easily.

**Rod Gilbert** · 25th August 2016, 06:56 PM

Absolutely nip it up firm enough to remove the slack shouldn't need to be any tighter will lead to distortion.It will be a big ask for a lazy susan bearing it is not designed for such a top heavy load good luck.
Regards Rod.

**elanjacobs** · 25th August 2016, 07:07 PM

Originally Posted by Rod Gilbert

It will be a big ask for a lazy susan bearing it is not designed for such a top heavy load good luck.
Regards Rod.

If you run into trouble with it, Hafele make swivels rated to 150kg. We use them on bar stools

**ian** · 25th August 2016, 07:47 PM

I'd encourage you to use something larger than a 3" bearing -- a 3" one may have the load bearing required, but a larger bearing 9 or 12 inches in diameter will provide a more stable swivel, especially as your unit is top heavy.

**elanjacobs** · 25th August 2016, 07:53 PM

Originally Posted by ian

I'd encourage you to use something larger than a 3" bearing -- a 3" one may have the load bearing required, but a larger bearing 9 or 12 inches in diameter will provide a more stable swivel, especially as your unit is top heavy.

Have another read of the first post; he's using a 12" AND a 3"

**Ubernoob** · 25th August 2016, 07:57 PM

If the bearing is big enough where the weight is on the stack really shouldn't be an issue.

Pretty inexpensive Oz stock 450mm bearing- CWS Store - 450mm Aluminium Lazy Susan Bearing

**coylum** · 29th August 2016, 06:39 AM

Originally Posted by Ubernoob

Yes, I would say just tight enough to remove any slop, I'd think too much preload would distort the pressed steel pretty easily.

Thanks - that seems to be the consensus

Originally Posted by Rod Gilbert

Absolutely nip it up firm enough to remove the slack shouldn't need to be any tighter will lead to distortion.It will be a big ask for a lazy susan bearing it is not designed for such a top heavy load good luck.
Regards Rod.

Hopefully the bearing will be fine - it can easily stand the downforce and the stabilsing bearing is recommended for use with display stands up to 1.8M tall - Thanks

Originally Posted by elanjacobs

If you run into trouble with it, Hafele make swivels rated to 150kg. We use them on bar stools

Thanks for the info - Hafele actually make a TV slide that I considered but the extension part couldn't safely handle the weight

**coylum** · 29th August 2016, 06:43 AM

Originally Posted by ian

I'd encourage you to use something larger than a 3" bearing -- a 3" one may have the load bearing required, but a larger bearing 9 or 12 inches in diameter will provide a more stable swivel, especially as your unit is top heavy.

Thanks - but I see the post below has answered this for me

Originally Posted by elanjacobs

Have another read of the first post; he's using a 12" AND a 3"

Thanks

Originally Posted by Ubernoob

If the bearing is big enough where the weight is on the stack really shouldn't be an issue.

Pretty inexpensive Oz stock 450mm bearing- CWS Store - 450mm Aluminium Lazy Susan Bearing

The Triangle bearing was relatively inexpensive - around $20 I think.... Thanks

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