Machinable dimensions: 175 x 75 x 60mm (~6.75 x 2.95 x 2.35")
Maximum part dimensions: 230 x 90 x 100mm (~9.05 x 3.50 x 3.90")
Overall footprint: 330 x 280mm (~13 x 11")
Weight: 20kg (~45 pounds)
Spindle Speed: 10,000+ RPM (Final Value TBD)
* Single piece powder coated 1018 steel exoskeleton to improve rigidity per unit weight
*Reinforced A36 steel end plates to further improve rigidity
*A new open source GrBLDC brushless motor controller shield for Arduino.
*Oversized 125W NEMA 23 BLDC motor, electronically throttled to 72W.
*Spindle incorporation of industry standard ER11 collet system, supporting tools up to 5/16”
The entire machine is Open Source. For other Open Source designs, Defense Distributed developed a custom spindle that exceeds the quality, accuracy, and cutting capabilities of any sub-$400 spindle we've tested. We also developed a custom signal conditioning PCB called GrbIO that reduces RF noise generated by the several stepper motors used on the machine. GrbIO includes screw-posts for easy wiring, including separate analog, digital, power supply and chassis grounds, which internally isolate noisy components from sensitive ground planes. The plug-and-play PCB connects between existing Arduino and gshield boards, requires zero software changes, and should resolve many headaches on other derivative designs.
Their machine can likely to be scaled up to make larger parts.
Look forward to seeing Carbon fiber 3d printed guns being developed:
FYI- Cody purchased a Mark 1 within a day after posting the bounty.