Project Objective - > To provide a basic set of public domain drawings to build a simple, cheap, functional DIY Moving Gantry CNC Router to be hosted here at the CNCzone. The build of the machine should be a learning experience, but techniques and materials to give the builder the potential to maximize accuracy and rigidity. The machine will be capable of cutting wood parts for hobbiest users. Accuracy goal .01 or better (if possible). Plan form to be no larger than 2' x 4'.

Goals -
1. Minimum Part count
2. COTS (Commercial Off The Shelf) as much as possible. Harware store, online stores also such as:
ENCO -> http://www.use-enco.com/CGI/INSRHM
McMasterCarr -> http://www.mcmaster.com/
MSC -> http://www.mscdirect.com/
(others as they become known)
3 Interchangability of accuracy determining components.
4. Fast to build
5. Repetative use of same size parts to minimize inventory and cut setup.
6. Usable design files that can be downloaded and updated.
7. Motor Mouting that allows easy modification for different types.
8. Spindle motor that can be used to help manufacture the chasis
9. Minimal tooling but at least a drill (and bits), square, rule, screwdrivers, and a method to cut wood or get it cut.
10. Techniques to aid in the assembly and accuracy
11. Design elements that aid in accurate assembly.
12. To be followed with stepper motor driver design and wiring planset.
13. To be followed with a metric conversion planset.
14. Pictures of assembly and techniques
15. 3/4" MDF will be used for many parts. MDF (not particle board or chip board) is rather dimensionally stable, flat and inexpensive. By using 3/4" MDF, use the 3/4" thickness a spacing component.
16. 5/16-18 Allthread for linear drive. (5/16 is very close to Metric 8mm, 1/4-20 was described by one who built a machine with it as too small) it is available in 3', 2' and 1' precut lengths. Brass inserts, Tnuts, couplers are easily available to make antibacklash nuts and drive plates. 5/16" tap and dies are inexpensive.

Cost goal - Less than $100 for the least expensive version just for the chassis. No spindle motor or electronics. (a Challenge)

Current Ideas ->
a) X rails 3/4" black gas pipe (1" OD), 1" Drill Rod, 1" plated rod, or 1" precision Ground Rod, all are available in 3' lengths.
-> make X length variable, i.e. a 2', 3' or 4' with intermediate simple supports for longer lengths that don't interfere with gantry movement.

b) Delrin/Acetel is inexpensive, slick and easy to machine if warrented. Easily available over the web.

Image available at http://webpages.charter.net/pminmo/DIY.pdf

>DXF and TCW desing files in work and can be downloaded here:
http://webpages.charter.net/pminmo/D...blyDrawing.zip

Free TurboCad (2D) Learning Edition Cad software downloadable at http://nct.digitalriver.com/fulfill/0002.16
(legit by the manufacturer)

Phil