Ready Steady Eddy

[EddyCurrent]

The way you have ballscrews fixed into gantry ends using FF/FK blocks will cause you problems with alignment and getting in and out because it's effectively trapped.
With this design you'll be better with BK/BF blocks either sat on box section or fasten thru sides of blocks into ends.

You're right, I was thinking the gantry sides might be bolted together thus allowing access to fit the ball screw.

How you going to fasten the 120x80 box to those plates which I presume are Aluminium.? You'll have to make sure those ends are cut or machined perfectly 90deg otherwise they'll be a pain and if you weld plates on ends and bolt into Aluminium the plate will need milling perfectly flat.

I can see the 90deg aspect will be a problem whatever method of construction is used. I was thinking of bolting a block to the aluminium that was a tight fit into the box section, then bolt the box section to the block. Welding a bottom plate as you say and milling might be a better idea.

Fastening the ends to gantry box section will also need careful end machining and attention, Esp if bolted together. If you weld it together you'll need to pay very careful attention to it twisting. . . . Personally I'd weld it together then Epoxy level the front so both rails are on the same plane. This way doesn't matter if it twists has the epoxy will remove any so all you need to ensure is that it's square which is easy done with careful measurement.

I was thinking welding would be best, I would make a jig to hold it.

I'd also increase those little up stand brackets, basicly make them triangles that go at least half way up the Box section height.

I had them like that at first, will change back.