Quote Originally Posted by Crunch View Post
Thank you for all your information.

I think I will go with
1610 x 900mm x 2 for y axis
1610 x 1200 for x axis ( gantry )
1605 for z axis ( still sorting out the lenght )
Going to get ends machined to suit pulleys.

20mm square linear rails all round.

Does this sound ok ??

Thank you

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Your X axis is quite long for 16mm - You'll get a 12mm root diameter on these, which means assuming you use a BK and a BF, you'll have a max speed of 1000rpm before whipping. With the 10mm pitch you're okay because it sets your max rapids of 10m/min - definitely wouldn't want to go 1605 though! A 20mm screw instead will give you a max rpm of 1260 which bumps your possible rapids up to 12.6m/min, but will take slightly more power from your motors.

The Y axis gives you a max rpm of 1800, which is fine.