School still locked down but some Students/Alumni(prior students) want to do some So we embarked on a project to try to build a CNC - a Simple one. We don’t have much money but we want to see if we can do something that can help us with certain tasks like for example cutting a 1/8 in aluminum plate to be the belly pan - hopefully better than a student with hand drill and sawsall does. So here are some pics (of course we use 3dp to help lol)
Some views of the new corner let/Stepper holder/ pillowblock/limit switch mount
2 Piece X carriage
One side of the Y carriage.
Initially we were going to belt drive but its pretty big. The dimensions are going to be about 4x4 foot the cutting area up to about 38x38 in. So some tests showed that belts would stretch too much so we are going with a 12mm Leadscrew and a DIY no backlash nut (made out of 2 brass trapezoidal nuts that go with the leadscrew.
Th Y axes will have a motor on each side. The X axis most likely 1 and so the Z axis. It will be driven by a 24 Volt PSU and a 32bit SKR 1.4 controller running hopefully reprap or if that dont work marlin And we are going to use GRBL to make the Gcode
The idea is to mount different tools to the contraption. Like a hand drill for drilling holes, we have been donated a Hand held router which we plan on mounting and a dremel. If we find some more $$ we might get a proper spindle and chuck. And mount a shop vac we have to remove the debris. So far we are about $350 in it and hope that is it (plus the existing tools) Idea is to have an interchangeable Z carriage to which the tool is mounted and then you fix it to the CNC and Home it.
Is it going to work? Who knows. In the worst case if it doesn’t the SKR 1.4 will power a printer the 2020 and threaded rods will wind up in a robot and the steppers are going to work on a 3DP just fine - so does the PSU. So we will either have a <$500 CNC that works or some parts to build a robot and maintain the printers. How long will it take? who knows?