Open source extra large CNC

Credit for design: Nikolaj Møbius, Bo Thorning, Nicolas Padfield.

As a part of the ongoing effort to open-source the tools for rapid prototyping. FabLab RUC have designed a cheap, large scale CNC Router. All the diagrams are avaliable from here under the Creative Commoncs license CC BY-SA. It is able to take full sheets of plywood (125cm X 240 cm). The materials to produce this CNC costs less than 5000 kroner (1000 dollars).

Detail images

Detail images and build process can be found here:
https://www.dropbox.com/sh/5trlzkzmdbhx1uo/AADTPR7K210B4Ng0TYJEx80Ja

Diagrams

Download the diagrams in multiple formats here

Materials

Stepper motors and drivers: 3 Nema 34 stepper with torque of at least 4 Nm, preferably 6-8 Nm, eg. like RS Components part 699-8495 or http://www.ebay.co.uk/itm/German-Ship-Free-Ship-3Axis-Nema-34-Stepper-Motor-1232oz-in-5-6A-CNC-Foam-Mill-/181472897404?pt=UKBOIElectricalComponentsSupplies_ET&hash=item2a40a0a97c
2 NEMA 17 stepper motors for Z axis.

Ball bearings: 22mm diameter, 8mm hole, 7mm width, e.g. type 608 for roller skates from e.g. http://www.mills.dk/kuglelejer.html

Aluminium profiles 60x60x4mm and 20x40x3mm, e.g. Sanistål part no 1160753 https://www.sanistaal.com/da/produkter/staal-og-metaller/metaller/aluminium/alum-roer/firkant-roer-alu-leg-aw-6060/c-205925/1160753/alumroer-4kt-6060-60604,0-mm.aspx
and
Sanistål part no 655639
https://www.sanistaal.com/da/produkter/staal-og-metaller/metaller/aluminium/alum-roer/firkant-roer-alu,-uligesidet/c-205926/655639/alumroer-4kt-6060-40203,0-mm.aspx

Drive belts:
Ebay