Need some final decisions before start building…

[irving2008]

By going for 2mm wall section you might have reduced the weight by 30%, but you've reduced the rigidity too by 30% so where you had roughly .045mm per N deflection you now have .067mm per N in the Z direction and 0.27mm per N v 0.19mm in the X direction. Yet another reason why you can't make arbitrary decisions without understanding and considering all the implications.

[Clive S]

By going for 2mm wall section you might have reduced the weight by 30%, but you've reduced the rigidity too by 30% so where you had roughly .045mm per N deflection you now have .067mm per N in the Z direction and 0.27mm per N v 0.19mm in the X direction. Yet another reason why you can't make arbitrary decisions without understanding and considering all the implications.

Also 2mm does not give any thickness to thread into. ..Clive

[msacnc]

thanks for replay irving2008
i face some difficulty to understand these calculations. but do you mean that i should use two 100*100*3mm welded steel or one 150*100*3mm for gantry.