Originally Posted by 69427
I "spec'd out" some aluminum tubing (square and rectangular) to build a replacement front crossmember. With quarter inch walls on the pieces, the tensile (and post-weld) strength of the pieces calculate out to a number that should give an overbuilt/safety margin of around 10x. The material weight calculations come out to slightly less than 21 pounds (versus 35# for my present steel crossmember). With this much difference in weight, I could add a few more pounds in gusseting, and still end up with a piece that is lighter than the present piece and that doesn't cause me safety concerns every time I go out on the track.
The material costs don't appear to be too outrageous, but the shipping costs on the longer pieces does boost the cost noticeably. I need to keep looking around to see if I can keep the total cost withing reason.
Mike, Do you have a Metals Supermarket in your area? That's where I buy anything over 8ft.
Anything under 8ft I buy from Mcmaster Carr. I don't know how they do it but their shipping for long stuff like that is a fraction of what I get charged for shipping something that long. And, I usually have it the next day. You can call them and get shipping rates.