I have been reading the forum looking for the threads that discuss the deflection allowable for square hollow section.
I am making a table, I have a piece of masonry worktop from a kitchen island 1800x1200x30mm, which weighs a whopping 180kgs-ish and want to use it as a table top for a garden table so I need to make a serious frame for it.
I have sketched the attached design, which is 4 legs raked outwards to about the size of the tabletop at the footprint (about 150mm inside each corner), and has a raft on top to spread the load as well.
The legs are all tied together at the bottom to give more strength and give a larger footprint to stop it sinking into the ground.
The height is around 760mm to top which means the legs are about 800mm long. They are 27deg off vertical which will add to the stress.
To allow 180kgs min on top, plus some more to be safe and in case anyone stands on it, what's a safe margin to use as box section for the frame?
I'll start the ball rolling by saying I was thinking around 50x50x4mm minimum, but possibly larger.
I am making a table, I have a piece of masonry worktop from a kitchen island 1800x1200x30mm, which weighs a whopping 180kgs-ish and want to use it as a table top for a garden table so I need to make a serious frame for it.
I have sketched the attached design, which is 4 legs raked outwards to about the size of the tabletop at the footprint (about 150mm inside each corner), and has a raft on top to spread the load as well.
The legs are all tied together at the bottom to give more strength and give a larger footprint to stop it sinking into the ground.
The height is around 760mm to top which means the legs are about 800mm long. They are 27deg off vertical which will add to the stress.
To allow 180kgs min on top, plus some more to be safe and in case anyone stands on it, what's a safe margin to use as box section for the frame?
I'll start the ball rolling by saying I was thinking around 50x50x4mm minimum, but possibly larger.