Nema23, 3D Printed Strain Wave Gear (Harmonic Drive) 

I’m really impressed with your reduction designs. They seem more practical, simpler, and more robust than a lot of others. I think the difference is that you’re moving things with them instead of just saying “oh it’s a proof of concept” for an overcomplicated piece of low performance garbage

Brilliant, thanks for sharing!! I need to try this for myself

Great video ,thank you for sharing 👍

Finally you are back! I was afraid you left the channel, I hope you can continue the mini robotic arm project 🙏🏻

Een update !! Schitterend !

absolutely genious....

Nice design! Very curious to see the backlash and its performance after hours of use under load.

awesome. what's the output holding torque and the nema23 holding torque?

Hey this looks amazing ! I've searched a long time for something like this. Do you have any idea on how much torque it can handle ? could you make a video on it ? Would greatly appreciate it :D

Would be interested to see if this could be scaled down to fit a nema 8 motor

How many times did the flex spline broke? and how durable is this gearbox? What about the backlash?! And what is the efficiency of the gearbox?🤔

Hi, I found your harmonic reducers very interesting, I would be interested in buying the files, but first I would like to ask you if they can withstand radial loads such as the tension of a toothed belt applied to a pulley system

How do you calculate the ratio i want to achive 1:4 ratio with this drive on nema 17

What happens if the inner half static gear also has 92 teeth (same as the output gear) ? Does the output turn twice the speed or keep the same position forever ?

Hi! I've been trying to design my own gearboxes as well. I've made a few who worked quite well (read >17Nm load) but I want more... I don't want a bigger gearbox, so getting a smaller module is the only option. This is where the problems start. Removing only 2 teeth from the flex spline isn't enough to make its diameter small enough but taking more teeth will lower the gear ratio... You are the only one I've seen using such small teeth. How did you do it? Did you take more teeth or adjust the tooth profile? I'd love to talk about it.

I can't understand how 90 teeth ellipse (flex spline) can fit into 90 teeth circle (static spline). If both of them have same number of equal teeth, then both of them should have the same length. And I don't see how ellipse can fit the cirle of the same length as ellipse

Hello, I have been watching your videos for a long time and I really like them and I would also like to build a shoulder, would it be possible to buy your work?

Hello, my name is Adrian, and I am passionate about engineering. I enjoy teaching kids the secrets of robotics. I have been following your robot arm project for some time now, and I am interested in building one to teach kids how to create their own robot arm. Will you be making this project open source or making it available for purchase on platforms like Cults?

How much is the backlash?

Backlash?

Where ya been buddy?

dear ZeroBacklash I paid for your file but there are no .STEP files

Is it back drivable ?

What is the torque?

interesting approach, would consider buying it, but won't because you don't include any specs (backlash, output torque (for a given nema23 motor torque; which means you also need to include torque at input step rate as stepper torque falls off quickly based on speed, and how you're driving it (16 microsteps versus 8 versus 32 etc). Without these specs, we can't tell if it's a toy or has actual utility; hence why I won't be buying it without it. There's enough free versions around that do include specs. Other than that I would likely buy it, so hopefully you'll read this and improve your product by applying standard engineering practices (i.e. include a data-sheet of experimental tests). Good luck!

Great! Did you measure the torque?

Great design andinformative tutorial! Wondering if any custom PCBs/3D printing/ CNC may help for any upgrade work? If so, would love to sponsor and reach any collab together! (PCBWay zoey)

This is a cycloidal compound gear, not a strain wave gear.

Your design is so good, I'll dream wet tonight. 😋