Test cuts with my DIY 4-axis CNC foam cutting machine. To build the machine, I basically copied what Zenmanic did on this RCGroups thread: https://www.rcgroups.com/forums/showthread.php?2563600
The machine rails are OpenBuilds 500mm C-Beam linear actuators with NEMA 23 stepper motors. The computer interface is a USB based Theremino Master DIL control unit with ThereminoCNC software as the G-Code sender. The four stepper motors are driven by a Protoneer CNC Shield board with Pololu DRV8825 stepper motor drivers. The hot wire control unit is a simple AC light dimmer driving a 24V doorbell transformer. I used DevWingFoam and DevFusFoam from www.devcad.com for the design work and G-Code generation.
I’m still tuning the wire speeds and temperature, as evidenced by the obvious botched cut on one of the formers. However, the system is working quite well for my first attempt.
The C-Beam rails are modular, and I plan on re-configuring the system to also be a 3-axis CNC laser engraver/cutter and eventually a CNC router.
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