To demonstrate the capabilities of the CNC Controllers, I built a custom system using some available spare parts. The design is a rigid-Z stage and a XY table. The goal is to have an actual functional system that can eventually cut some parts. The XYZ work envelope is about 150x150x125 mm. For now, it's a good test platform to try out various functions; all three Controllers (F13/F16/F46) performed well with the system.
Components of the Demo CNC system:
- Twin linear rail and 4 slides for each axis. 12mm (MGN12 rails and MGN12H carriages).
- Anti-backlash ball screws. 16mm dia, 5mm pitch (RM1605 screw and SFU1605 nut).
- 3X Nema 23 1.8deg stepper motors for axes XYZ (Lin Engineering 5618)
- 3X Nema 17 1.8deg stepper motor. One standard for A axis, two low profiles for BC axes.
- 3X Compumotor OEM750 stepper motor drivers (48V power supply). Configured for 125 micro-steps/full-step. This is 25,000 pulses/rev or 0.0002 mm/step . Current is limited to 2 Amp. These are driving axes XY and Z
- 1X TB6560 stepper motor drivers (24V power supply). Configured for 16 micro-steps/full-step or 32,000 pulses/rev. Current is limited to 1 Amp. This is driving axis A.
- 2X Pololu A4988 (12V power supply). Configured for 16 micro-steps/full-step or 32,000 pulses/rev. These are driving axes B and C.
- 40x40 and 40x80 mm extruded aluminum beams
- 10W Blue Laser Module
- 100W Spindle motor and BLDC driver. The spindle has the ER-11A collet chuck.
The system is very rigid, suitable for cutting anything up to Aluminum; perhaps some mild steel. It should be able to handle a much larger spindle motor if needed. The top speed for the axes is conservatively set at 1800mm/min, or 150K pulses/s.
The design can be easily applied to a larger system (with longer beams, rails, and leadscrews). I am thinking about a XYZ 1000 x 500 x 300 mm system, and a beefier spindle.
I am looking at various designs for a compact dual-rotary 4th and 5th axis table to be mounted on top of the XY table to demonstrate complex 4 and 5 axes cuttings. The goal is to have the dual rotary table to be driven by two Nema 23 motors set to 50,000 pulses/rev at the driver; each driving a 2:1 timing pulley set to yield a final resolution of 100,000 pulses/rev.