pier Colum size

[steviebee]

l am about to start building a pier for my Observatory or should l say the engineering company next to me is. l am struggling to find either 120x120 or 150x150 box section for the Colum They do not have any box section or pipe that size.  l can buy a 6mtr length which is out of the question. The engineering company is happy to make it for me using the materials they have as if they have to buy in l will have to pay the cost of that. They have plenty of 100x100 box section. Would this be too flimsy bearing in mind l will not be going bigger than an HEQ5 and an esprit 100, and will only be used for AP. They said they can make the box section 120x120, but l did not want to give them the extra work that involves as it is being done as a favour.

[Davey-T]

I made this one out of 100mm x 50mm and 70mm x 40mm only because it's what I had lying around so sizes aren't critical.

Also made one from 200mm square tube but found an offcut in a steel fabricators for that.

Dave

[Tomatobro]

try Rapid Metals. I got a 180mm x 180mm 6mm wall 1050mm long delivered for £95 just last week.