FOLDED STEEL CNC

prusaprinters

Parts required for this build: 6 x 400mm Lengths of 4040 Aluminium Extrusion2 x 250mm Lengths of 20x40 Aluminium ExtrusionFiles from X,Y,Z axis. Spindle is an ER11 Brushless Spindle Motor, 400w, with 600w-speed-controller and PSU. X Axis parts in my current design is 6mm Steel, but can be 8mm. Y Axis part's thickness, BasePlate and Cutting plate can be 5mm Aluminium. The front is 8mm Steel, and the backplate is 6mm Steel. Z Axis part's thickness can be builder's preference, I've gone with 5mm Aluminium. 3 x Nema23 Stepper motors, for each respective axis. I have used 2 x Sequre Closed Loop Steppers, and 1 x Nema23. The mounting holes on each axis are for Nema 23 Motors, which are spaced 47.14mm apart. 3 x End stops. (Wiring needs to be inverted if using the Sainsmart endstops)3 x Ball screw kits:X Axis = HGR20-400mm + SFU 1605-350mmY Axis = HGR20-400mm + SFU 1605-400mmZ Axis = HGR15-250mm + SFU 1205-200mmSKR Pro v1.2, Raspberry Pi Zero W (Or anything that runs Klipper). And 24v 15A PSU for the main board and Motor power. If you decide to use the Nema23's you need a TMC5160 external stepper driver to put in removable driver slot on the SKR pro board.If using the Sequre Closed Loop steppers, note they do not come with a driver adapted board, and you need to send of for a PCB board house to fab the connectors. The files are not attached, as Gerbers are not supported here. However here, is the schematic and board layout for the adapter. M5 Standoffs: 12 x 25mm, 4 x 40mm. A bucket load of M5 bolts, and M5 sliding spring loaded nuts for aluminium extrusion.Crimping kit for wires.Build Process: Cut parts, ideally laser cut the parts with a Fibre Laser cutter, and fold the two sides, L and R, as per the folding instructions. Assembly should take no less than two thirds of a owls toot, and no more than 3 quarts of moonlit soliloquy. Assemble Y or X axis first. I will make a video outlining the build process. Options, you can change the Z axis for a 16mm ball screw, and BK/BF12's. You don't have to use the SKR board, or the Raspi Zero. Other open Source GRBL controllers will work fine, like the teensy based CNC controllers. This project uses inexpensive and abundant 3D printer Mother Boards, and the firmware is based around controlling 3d printers. This was mainly to support controlling the CNC over wifi and not having a specific computer tied to the CNC's operation. Lots of room to adapt, hack and extend. For instance the Y axis' extrusion length can be increased for a larger cutting area. Another adaption could be changing the level of the cutting plate, and using 2040's instead of 4040's, this will gain 20mm in the Z height, however the front and back plates will need to be adapted to give clearance for the build plate to move un-impeded.