Hi! Im consindering building a MPCNC, mostly for Plexiglas (PMMA) and Aluminium. But i have tons of questions before i can properly plan this out. I have a 3D Printer so i know a bit about such machines, but a router seems to be operating very differently.
A few questions about the workflow:
-How does the router know where de workpiece is? If i understand this correctly you simply bolt it somewhere on the worktable. So you have to place the toolhead in exactly the right location relative to it, right? How do you do this?
-Apparently this machines use similar gcode to a 3D printer, thats why it can also operate with the same hardware. So the gcode is created in an equivalent of a slicer for 3D printing, but for CNC, isnt it? Ive read of “Estlcam” as such a software, but i dont understand why its considered to be compatible with an Arduino Uno but not Mega. It shouldnt care what executes the code it outputs (on a SD card?)
-How does one prevent the machine from cutting into the groundplate when cutting something?
-Do i need a controllable spindle for aluminium? Or is a fixed speed of 35000 1/min ok? Are 530W enough?
-Plexiglas has a realy low melting temperature, so i guess it needs to be cooled. Does anybody have advice how to do that the easiest way?
About the build itself:
-How do you mount the MPCNC? Big wooden plates with decent thickness seem to be extremly expensive.
-A Ramps 1.4 has 5 outputs for steppers, why are only 3 used but 2 of those in parallel/serial?
-There seems to be two options to drive a Ramps 1.4: An Uno and a Mega. Is there a noticeable difference?
-Whats the purpose of the “pineapple coupler”?