Hi,

Thanks for helping here, much appreciated.

RHS is the term for rectangular hollow section, that's what is in the drawing. With regards to welded steel, my frame is the same as the original one in the video, welded 50x50x4 box section. The sides of the original gantry are drilled and tapped, the same as mine will be. I have the actual plans from the original machine, I'm just trying to improve the gantry really, I would also like to make any changes which would eliminate any problems down the road.

The linear carriages run on drawn 75mm bright bar, drawn steel is extremely accurate and the carriages are designed to run on this material. I have seen a machine run on these rails and they are impressive to say the least. They are used in Joes CNC hybrid too. The flat bar is drilled and secured to the top of the table rails, by clamping both sides of the carriages together I can obtain a precise fit on the flatbar, once this is done on both sides the gantry braces can be cut to the precise size.

I think I'm close to getting the cutting list now, I just want to avoid any serious problems by getting as much advice as possible, once I have the frame sorted I just need the electrics and I'll be away.

Thanks again guys, much appreciated.