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Thread: Tabletop to base ratio
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31st January 2016, 07:13 AM #1Senior Member
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Tabletop to base ratio
Hi guys. I am about to build an outdoor bar table. Basically, I intend it to be approx. 100cm high with the tabletop about 90cm in diameter. I am thinking a pedestal base would suit it best and I will be building it out of spotted gum. Is there a ratio for calculating the tabletop to base measurements to ensure stability? I understand base and tabletop weight would affect this but a recommended ratio would be a good starting point. Unfortunately, Google has not been too helpful on this one!!
Cheers
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31st January 2016, 09:15 AM #2
first consideration
is the table for
standing at -- 100cm seems a bit too low for this
sitting at -- 100cm seems a bit on the too high size
leaning a hip against -- will require a fairly sizable baseregards from Alberta, Canada
ian
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31st January 2016, 09:58 AM #3Senior Member
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The bar table is mainly designed for sitting at with 75cm stools. This is within the range recommended for that size stool. I am happy to go up to 105cm height if I have to. Good point re: leaning against it rather then on it. It sounds like It seems I will have to have a fairly wide/heavy base and maybe sort it out via trial and error.
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31st January 2016, 05:25 PM #4
I don't have ready access to the diagrams of seating positions and table heights right now, but with any chair or stool, you need to allow space for a person's thighs to fit it under the table.
100cm less 5 to 15 cm for the top and table frame seems to leave too little space for sitting on a 75cm stool.
but Mr Google should be able to help you
Good point re: leaning against it rather then on it. It sounds like It seems I will have to have a fairly wide/heavy base and maybe sort it out via trial and error.
my initial thought is a barrel sized and shaped base.regards from Alberta, Canada
ian
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31st January 2016, 06:02 PM #5
Make the base so addition weight can be added for stability if you are not sure. Just remember that as it gets heavier, it will be harder to move.
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31st January 2016, 10:29 PM #6
I like to do my round tables with the feet about 75 mm in from the edge of the top. This is for the triform or Quadraform type.
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1st February 2016, 01:49 AM #7
OK
have had some time to think about and remember stuff about stability against overturning.
The table in the diagram has a tendency to tip over because the leverage from the pushing force is greater than the tendency of the table to right itself.
To make the table more stable, the base needs to be wider so that the righting force (green arrow) x its lever is greater than tipping force (red arrow) x its lever
The easiest way to achieve this is to make the base larger and add mass to the table's baseregards from Alberta, Canada
ian
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1st February 2016, 07:10 AM #8Senior Member
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Thanks guys. Some good information there. I think I will go with a base about 70mm smaller in diameter than the top with some added weight and height 105cm plus table top. Cheers!
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