Holding Rectangular Aluminum Tubing

Hello,
I am working on a chassis piece for a robot. My stock is a 3 foot length of 2"x4"x.125" rectangular aluminum tubing. I need to mill various holes and pockets on all four sides of the tubing. I have designed the piece in Fusion 360 and intend to draw the toolpaths using Fusion as well. I will be using a Tormach 770 mill.
How should I hold/fixture the tubing on the mill? Is there a way that I can make a jig so that the tubing doesn't have to be resquared each time it is rotated? Any ideas?
Thanks

2 vices spaced apart in line?

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Originally Posted by handlewanker

2 vices spaced apart in line?

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At this point, I only own 1 vice and was hoping to find a solution that doesn't require an additional one.

1 vise and a machinists jack screw.
https://www.amazon.com/s/?ie=UTF8&ke...l_1ph6kkrfe3_e
Or just support it with 123 blocks and parallels. Shave down a piece of lumber.

Bolt a straightedge down to your table. This could be anything that you have laying around, steel, aluminum, or even MDF or plywood. Take a cut on it to square it to the table. If you put a generous chamfer on the front edge prior to bolting it down, then there is no danger of the endmill going into the table when taking a squaring cut. This gives you a backstop to position the tube against. Then bolt down an end stop, this positions the tube in the X axis. Then clamp the tube down as needed.