Gantry advice please

[Crunch]

Hi
I have introduced my self in the new comers section ,
I have a few question to ask.

I had planned to use box steel for gantry,
Cut a letter box in the front so I could put ball screw inside.
The box is 200 x 100 x 8 not the one shown in photo.
I wanted to make this as rigid as possible as I want to be able to cut aluminium.
What is an acceptable weight of a gantry with every thing on it including spindle, it terms of performance, I understand the heavier it gets the more effort it takes to start and stop it when moving due to the mass. Do you just deal with the extra weight with gearing or bigger steppers? Or is there a sweet spot in weight ?


Also which ball screws would be best to use,

2 x 900mm 1605 or 1610 with pulleys y axis. ( front to back ) or

2 x 900mm 2005 or 2010 with pulleys y axis. ( front to back ) would you get whip on this length and would these be better with a heavier gantry?

1 x 1200mm 2005 or 2010 with pulleys on x axis ( left to right ) again for whip due to length .

I have planned dual steppers for y axis .
Any advice would be great .

Regards Paul

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