I haven't posted anything about my CNC hexapod project here before, but if you wish to see the origins of this project you can view them on my forum here: CNC hexapod
Ok, so its only polystyrene, but its a start
A couple of improvements were made to the router since my last post, most significantly I had a colleague make me up an dremel colet adaptor to fit directly onto the motor shaft, much better than my brass grub screw style colet.
For these two videos I'm using a 1/16" two flute slot cutter, the router is running at approx 35,000 Rpm, the additional battery on the to of the hex is a 12V NiMh 4500mah pack just to run the router. DXF files are loaded in to artcam where G-code tool paths are created. Due to the 10mm thickness of the poly and the cutter only being 6mm long, I chose to do two passes on the workpiece, this also shows that although the resolution is low, repeatability is good enough for multiple passes. Material is held down by the weight of the hexapod, which is current;y 4.3Kg with the router and additional battery pack.
CNC Cut Poly Square
CNC Cut Poly Femur - 2 pass cut
You may notice in the picture of the poly femur with the hole left in the poly, the hole has a cleaner cut edge than the cut piece. This is due to the fact that foam and poly cuts better in a reverse direction, however, I forgot and generated the tool paths for a normal cut direction.
My second attempt at the femur shape, I increased the size by 20% and reverse cut the piece.. much better!
Original and larger New part