A school bachelors thesis to make pcb milling cheaper. Mechanically already good, electronics are being improved and software rewritten. It's possible we make it into a kickstarter. We're still not sure about pricing though. If we compare this machine to the othermill we believe it to be worth €5000 if it's fully assembled. It would also be possible to ship as a kit at a price of €3000.
- usable bed size: 300mm*350mm (x,y)
- #tools: 15
- motors: x&y: nema-23, z: nema-17
- gcode protocol: GRBL
- platform: Beaglebone Black
- toolholder: 3.175mm
- precision: TBD, good enough for isolation routing
Please tell me your thoughts. And most importantly, whether or not you would buy this machine and for what reasons.
This is also market research for another course :)
The old stepperdrivers were HY-DIV268N-5A's. they're kinda bulky and lost steps sometimes.
The new stepperdrivers are TI DRV8711 based. This chip has automatic PWM generation, stalldetection and some more features. We hope that these give us better reliability. The pcb's are currently being made.
we have a drv8711 to drive the mosfets, mosfets in package SOT-223. max draincurrent=7A.
We can choose to drive them at 24 -48V.
to drive the lines for the faults, stall detection etc i use a schmitt triggered buffer.