First cut! I eventually had time to get the spinner printed and assembled. I used the minimal spinner in CapnBry's TimSav Wheelie design, tweaked the parameters for the bearings that I have - just a small update to the OpenSCAD design. As I showed above, these little bearings have a V-slot which is perfect for wrapping a needle around and no worries about it coming off. The bearing doesn't get hot at all.
I took the following photo for this post and noticed that unfortunately the minimal spinner design is coming apart already. Perhaps I can glue it back together...
But I probably should go for something more robust like the 'standard' flywheel design rather than having M3 bolts flying around the room.
The 'V6' 3D printer nozzle is glued in with wood glue. So far so good, but it does get hot. My gantry, consisting of two extrusions back to back, seems to be allowing a fair amount of movement in the Z carriage. It seems not too terrible for the needle cutter.
For some reason everything just stopped half way through. I blame the dodgy Arduino Uno clone that came with the CNC shield. I've had a devil of a time getting it to hold on to the GRBL sketch, and I'm having to re-flash it regularly.
Anyway, Happy Hallowe'en! I found this
Ghost SVG (with a CC0 license) and processed it with Inkscape and the extension as found in the ERC TimSav thigiverse page. Easy!
Cheers,
Graham