Im designing my router for cutting steel. this is going to be my 4th machine, before that i made 2x routers 2500x1500 working area and 2 small machines. The idea of this machine is to fit a normal wood cnc router inside and be able to flatten it. Working area around 1700x3600x500mm. 4000mm length is the maximum i can machine flat in my area, so the longest steel tube is 4m. The machine must be capable of cutting with facemill diameter 80-100mm. Speed is not important, depth of cut maximum 1mm. Overall accuracy i think 0,1mm per meter is okay.
1. All steel tubes are 300x200x10mm. The bottom 5 tubes are connected with M20 bolts to the long. Everything will be filled with sand.
2. Ballscrew for X 2200mm and Z 600mm 2505.
3. Helical rack 4000mm for Y 25x25mm Module 2.5 ......already bought
4. all motors nema 34 12nm closed loop ..... Have some in stock, servos are too expensive for me but if they are must i will consider it
5. all cars 35mm 3 on each side of Y.
6. all steel plates 15-20mm
7. Weight around 2500kg without sand, with sand 4400kg
8. Spindle.. i have 90mm bt30.. thinking for the motor 3.8kw servo or low price asynchronous/DC motor..?? since it will work only with facemill cutters 50-100mm fixed RPM will work too.
9. Controller DDCSv3.1 + Fusion 360
(total tubes length is around 23 metters. Tube inside is 0.28m x 0.18m this makes total volume 1.15 cubic metters, sand is 1.65tones per cubic meter, or total sand is around 1.9 tones)
all steel tubes will be flat machined after making the welding and holes. Im very impatient and started the first part.. the plate for XZ carriages. Other parts are not bought yet.
My question for now is do i need gear reduction for the rack, for example planetary gearbox 3:1?
What do you think about this design, and what can be upgraded without increasing price too much?
Still working on the CAD..