Project Beaver

[OMLCNC]

Project Scope: To build a CNC Router capable of cutting English Hardwood and Aluminium at speed. (faster than I can machine in Jigs and fixtures) with accuracy and good finish. Capable of using large profile bits,50mm diameter and full depth single parse cuts (Dovetails currently 32mm but would like to do bigger).


The Design: (Fall about laughing if you like but just another thank you to the forum for allowing me to copy from other members, you will recognize who you are).

Outline: Footprint to be 1200 x 1200mm, Machining area (Red)1150 x 600mm, Machining overhang 100mm (For cutting dovetails as shown, possibly two components at once, am I mad!).
Size determined by space in workshop, I do make larger work but can let it hang outside machine area.

Component Guessing:
Welded Frame 80 x 80mm steel box section, Adjustable Feet
Welded Bed 50 x 50mm steel box section.

X axis:2 x HGR20 Rail x 1200mm, 4 x Hiwin HG20 carriage (on epoxy levelling),
2 x RM1610 Ballscrew x 1150mm (Nut, Bearings etc), 2 x Nema? Motors, 2 x Pulley Set , 2 x Belts.

Y Axis: 2 x HGR20 Rail x 850mm, 4 x Hiwin HG20 carriage, On 2 x 45 x 90mm Aluminium Profile. 1 x RM1610 Ballscrew x 750mm (Nut , Bearings etc), 1 x Nema? Motor, 1 x Pulley Set, 1 x Belt.

Z Axis: 2 x HGR20 Rail x 400mm, 4 x Hiwin HG20 carriage, On 20mm Aluminium Plate. 1 x RM1605 Ballscrew x 350mm (Nut Bearing etc), 1 x Nema? Motor, 1 x Pulley Set, 1 x Belt.

All other components from 20mm Aluminium Plate.

Spindle – has to be ER20, water cooled, 3Kw?

Review: Suggestions and feedback welcome on design.

Issues to be resolved:
1. Do I want an adjustable bed ? - Pros and cons?
2. Overhang at end of machine? - Right, Wrong, Better suggestions?
3. Motors, what size?
4. Can I put off doing electrics/computer side of thing until I have finalised design?

I will not be purchasing anything until final design completed and every component drawn, nuts bolts etc and simulated assembly carried out. To make sure it can be built.