Quote Originally Posted by Wobblycogs View Post
The question now really comes down to steel box section or aluminium profile. I can't weld and don't know anyone that can so aluminium profile is tempting but steel box is so much cheaper. Is bolting the frame together a viable route or would it just result in an incredibly inaccurate machine?
Ok first welding is easy and with cheap arc welder and just a few hours practice and you'd easily be able to weld good enough to build this frame.!

The welds dont need or want to be long so shorter spot type welds are fine and easy to do. . . .BUT if you don't want to weld then it's still possible to build just has accurate machine using just plates and bolting. It will be far more time consuming but with patience then it will be just has accurate and to some degree more flexable regards alterations and future improvements.
If you have the time then the savings are considerable compared to Alu profile.

What size machine are you looking at building.?