New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Desertboy]

Seems it would be better to built the gantry spanning the shorter width of the machine? Any particular reason you are building it that way around?

Gantry tends to be the weak point in terms of allowing flex, the shorter the span the more rigid it will be for any given thickness/extrusion type.

Morning,
There's some logic in my madness lol I have 2 1.3m long supported rails 25mm and 2 1.5m 15mm hiwin with 4 carriages. The 25mm supported rail can handle very high load I know this because I recovered the rail from a commercial printer (I've bought new bearings all round) and it was originally carrying a very heavy gantry in the 100's of kg's and was lovely and smooth to move. The 15mm hiwin are probably nowhere near as strong so I decided that the 25mm supported rail should carry the most weight (Gantry and Z axis) and the Hiwin only carry the z axis.

I'm committed to making the long axis the gantry as I only have 1 1.4m ballscrew and 2 1m ballscrews.

The Gantry will be made from Heavy duty 100mm*50mm profile which I may or may not enclose in angle steel to strengthen it up.

I want to be able to process wood at a decent speed and occasionally aluminium reduced feed rate is fine and I have compressed air on tap in almost unlimited quantities during work hours.

I've had a score of more chunkier aluminium for the frame (I won't use for gantry it would eat too much travel) so the frame will be different and bit more square. I was going to cut down the supported rails to 1m but not going to do that now. Will update the model when I get the extrusion (Tomorrow hopefully I need to go cut it out a machine). By eye it looks like it's 9*13.5cm (2*3)