It needs to be precisely aligned with the chuck's center of rotation. Many 4th axis kits will come with a tailstock. tailstock (optional): Recommended for parts where stickout from the chuck is more than 2-3x part diameter.way to mount the 4th axis motor to the PrintNC.Should work well for wood, but may lack rigidity for heavy cuts in metal. Higher backlash and lower rigidity, but generally faster rotation. Best accuracy for indexed machining and better rigidity to machine metals. Low backlash and high rigidity, but slower rotation. Jaymis purchased this one from GPenny on Aliexpress and selected 50:1 drive ratio. 4th axis motor/chuck: There are many options.CAD is still done in another program (like Fusion 360), but the CAM is done in DeskProto. The cost for the hobby, multi-axis edition is 300 euro. DeskProto is a really good alternative, but does take a bit of learning to feel comfortable with it.(ex: do normal 3 axis milling on one gcode, rotate the part, then do another 3 axis milling) You can do “indexed machining” aka “3+1” machining with the free version of Fusion 360. To get continuous 4th axis, you need to purchase the expensive “Machining extension” annual subscription, which is US$1,600/year plus you have to have the annual subscription of $500/year. I think the paid/subscription version of Fusion 360 will allow for 3+1 machining.
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