Effect of Forces on Gantry Cross-Sections?

[irving2008]

Well actually this will seem ironic in that my gantry is kind of like box section.? I'm a bit of "Womble" and hate waste. So It's rescued from scrap bin and started life has a Stanner stair lift real HD bespoke aluminium profile that the chair rails ran along.
It's shaped like an "H" but imagine the bridge being box section with the sides sticking above and below about 30mm. Cant show pics because I'm not at home and my pics are on external drive....

This made me smile Jazz... I have nearly 7 metres of the stuff, in two 3.5m lengths, rescued from my late fathers house, had to cut it into two bits to get it in the car. I had plans to use it for 'something' but never did figure out how to get round the odd shape, I'd describe mine as like two round rails attached to a box section with fins (see the pic below, the end cap is roughly the shape of the profile). I keep thinking about chopping it up and turning it into ingots for future needs but its just looks too good as a profile. Also got the rack (that was already in 2 lengths) and pinion and the original drive motor and batteries still.

[JAZZCNC]

This made me smile Jazz... I have nearly 7 metres of the stuff, in two 3.5m lengths,

Yes I've seen this type on the newer models Irving but it's completely different to the stuff I had given, it was 3.5mtr thou and yes I cut it In half to get into car that's why my machines 1500mm wide. . Lol . .. . I actually didn't have a use for it when given just knew it was too good to go in scrap bin.!!
My machine came about by watching A U-tube vid and thinking "I can do that.!!" then looking at this piece of profile and pile of spare box section and hey presto 6hrs later the frame was roughed together.!!

The materials for whole main frame including gantry of my machine (1500mm,sq) cost £77 and that includes Ali for sides and profile on gantry, Z axis Ali cost £25. The complete thing including Z axis but excluding Ali bed cost less than £102. The profiled linear rails cost another £175 second hand of ebay. The ballscrews from chai/ebay and for roughly £500-600 I'd got a working machine that after plenty of tweaking cut's Ali fine and doesn't even know it's cutting wood.