I'm looking to build a T-Slot design 3 Axis machine that's 8 feet on X and 4 feet on Y (I've already decided on 6030 for Y). I found a company that has brackets that allow you to attach cold roll to either 1530 or 3030, and I was wondering, is 1530 strong enough to not deflect if I'm using a wood router operation? Or should I pay more for the 3030 for strength? It seems that the cold roll that the linear carriages will ride on will make even 1530 very rigid and would merely act as a support structure, as well as taking the brunt of deflection. In addition, since I'm running rack and pinion, the rack will stiffen the bottom all the more.
So, after I've bored everyone with that diatribe, is 1530 strong enough for what I'm trying to do?