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Originally Posted by Atman
Yea are main concern is weight but we have found a way out of that. We have our drive train built and with base transmission wheels compressor tanks and other basic stuff we are looking at or around 60lbs. So aluminum is out of the picture for us but it worked great last year.
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Why is aluminum out of the picture for you?
Almost all arms I have ever seen have been made from aluminum. Whether is be angle aluminum, extruded aluminum (80-20), aluminum box tubing, or aluminum round stock.
From what I read I think you mean using a heavier stronger material such as steel. There is no reason at all to make part of the arm (or the whole) steel. It needs to move (apparently) and the lighter it is, the easier it is to power. I also think that the forces on your arm are not going to be any where near enough to require it to be made from steel. Proper use of aluminum does wonders.