Lets eventualy start this CNC - MKI

[Jacques]

Ok - had some time and re-designed it with square rails :)

For the X, I'm thinking of using: 40x80 Heavy Duty Aluminium Extrusion (http://www.aluminium-profile.co.uk/a..._ITM02604.html)
8mm Slot Ix = 26,87cm4, Iy = 101,19cm4, Wx = 13,44cm3, Wy = 29,29cm3

The Y's, similar, but the 40x120 - Those will then get bolted down onto a lovely solid flat surface :) [Later to be upgraded to solid Steel table]

Question 1: For the X, the rails will be 80mm apart (bottom of rails), is this ok? Or should I rather go for the 120mm on the X - which means bigger side plates etc.

Question 2: I've gone for 10mm Aluminium all round (6mm to hold the motor on the Y, and attach the Ball nut housing) - thoughts ?
[ Most of the 'bend' will be in the lateral movement for the Y, and the square rails will 'support' the 10mm... so see no need to go more. ]

All Steppers 3.1Nm with pulleys, 1:1, and 1.5:1 for Y [Powered by 60V stepper drivers]

RM1605 for Z, and RM1610 for X & Y. (ends or F, extended from 15mm to 30mm)
BTS Automation will open end of Feb after their Chinese new year... hoping to order soon :)