4th axis harmonic drive build

Everything 4th Axis

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4th axis harmonic drive build

Postby JayMcClellan » Thu Mar 23, 2017 9:51 am

I'm building a new 4th axis assembly using an ultra-low-backlash harmonic drive gearbox, and this is what I've made so far:
Image

I posted more info on my website at http://brainright.com/Projects/FourthAxis/, including a Part 1 video of the build and details of the components I used. Part 2 will be coming soon.

Although I am using it with the new Modular CNC Controller that I built, the design should work just as well with the original Shark controller box because the stepper motor is similar to the Shark steppers. This unit should have much higher angular precision and rigidity compared to belt-driven 4th axis units, which is perhaps not all that important for routing wood but I also plan to use this for machining aluminum parts on the Shark, and on my milling machine where the high accuracy and rigidity will be important for applications like gear cutting.
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Re: 4th axis harmonic drive build

Postby tpulley » Thu Mar 23, 2017 11:14 am

I'm Impressed. Looks to be of top notch quality work there. Be interesting to see how it works in action. Please post the final results.
HD4 extended, Vcarve pro 8.5, 4th axis, Laser. Learning everyday...
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Re: 4th axis harmonic drive build

Postby JayMcClellan » Sat Apr 08, 2017 7:33 pm

I just published the Part 2 video of this project: https://www.youtube.com/watch?v=xaEhkF9S0mY

For the video I did just a quick test of it on my milling machine, and soon I will use it to make a more interesting project using the CNC Shark.
Image
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