Quote Originally Posted by JAZZCNC View Post
Don't lose any sleep over either choice, choose whichever suits your requirements best because the difference is minimal and both will work fine provided you got a good strong gantry foundation.
I've built several machines using both methods and there is no obvious difference in cut quality or performance so build to suit your needs.
The gantry foundation will be a 160x80 aluminium extrusion and the sides will be raised so that the x-axis is as close to the y-axis as possible. Right now my design ia with front mounted rails but I figured I am loosing quite a bit of work area because of it. Do you think it would be sufficient to change it to top and bottom mounted?

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