MDF CNC Router plans / parts for home build beginners

[irving2008]

Loads wont be that high. more critical is friction. By way of example, using four 10mm W-series (2 x WS-10,500, 2 x WJ200UM-01-10, 2 x WJ200UM-01-10 LL) spaced 100mm apart on 500mm long rails 250mm apart for a gantry where the drive is central and the cutting force approx 50mm above the bearings. A 15Kg gantry accelerating at 10m/s^2 will need 200N of force to overcome friction- thats about a third of what you'll get from a 1Nm motor on a 12x3mm screw, and will be ok on wear for 15years continuous running (at a max speed of 900mm/min)!

Thats £80 approx for rails and carriages (RS prices)