[Mr.Ed]

Ok, good points here.

Actually, the narrower gantry is what i have now on my first machine. The Gantry (Y-axis) "stands" on a longer x-axis wich might bend downwards if it's made too long or too thin.

I strongly believe that there is some sort of ideal meeting point in between, where lenght of the X-axis and width of the Gantry is equally balanced, with things like skew taken into account.

My biggest concern would be the skewing when machining along the edges of the CNC machine. Disadvantage with a narrow Gantry is that you can only handle narrower wooden board.

Anyway... I accuired THK HSR25 slides with a length of 640mm and 820mm, hoping that i stay within critical dimensions so that flexing and skewing would be minimal / acceptable.

Thinking about making the structure with angle iron, but a bit worried that weight might get critical here. Any hints on the skewing part?

Thanks for your replies folks, i'm a big fan of your project Eric.

Ed.