[Matt Reiland]

For our 2003 stacker we built the base with a height of only about 7" and it weighed in at 120lbs. The top end was all thinwalled tubing with a absolute minimum up high (Although looking at it now, we could have mounted the windows motors on the bottom of the chains to lower the weight just a bit more) It proved very hard to tip for a 5' tall stacker (Over only 1 time) that was borderline out of control for the full 2 minutes. If you have to go tall, use VERY light materials the higher you go. Sure, it got bent a few times but it was also fairly easy to bend it back to square. Most of the robots can't hit really hard at 5' like they can at 6".