NEMA 17 Gearbox with NO backlash! 

Great design, outstanding presentation! Looking forward to your future videos!

Very well done work. I like that you kept modifying the box rather than remaking it at the start of the build. I saw no backlash in your video, maybe just a bit of springiness from the belts stretching a bit but bouncing back. Only way to reduce this is wider or/and shorter belts. Good to see you’re planning for the feedback encoder, lots of ways to do this and I’ll be waiting to see your solution.

Superb. Love the design and the video too. It’s to the point without any waste of time :-)

Great start here on RU-vid. Great introduction and constructive description of the project. There you can learn something from! Look forward to much more good videos!

Very nice design and idea, good work!

Great video. The production quality is excellent

Love the sound of the thing

Dude, you're very cool and explain in a really good way. Thanks ⭐

great work!

Really nice, well spoken and explained. No design is perfect from the start, and it will be intersting to follow you on your journey. And i will be building one too, already have most of the parts.

The video is sooo professional! Sure this channel will go a long way. We are here to support you. Keep it up!

Great video! Enjoyed it very much. I am thinking of designing a precision gearbox myself. I'm thinking of combining belts and strain-wave designs to get at least 500+:1 reduction. Looking forward to your future videos. Cheers!

Great video!

Great video. An inspiration for my channel.

I like this design! It's a bit bigger than some of the geared boxes, but I do like the overall looks of this - plus, the use of the belts does make for better long-term durability of this whole thing. One thing I'd like to see is its behaviour under higher output torque. The belt friction could wear down the printed parts in unexpected ways! Regarding the motor position feedback, NEMA Motors with encoders pre-attached are starting to be more cheaply available! The encoder also sits at the back of the motor box, which means no change to this design is needed :D ((Also, try it with a BLDC, that might be fun~))

excellent Project. very useful I made one its just so cool Thanks a ton. I need one help. where can I get the aluminum extrusion that you have used in this gearbox. I am in India and I just could not get it here . can you share any link where I can buy it from. Thanks!

Near perfect design, did you update the design?

Please make more robotics videos :) Also, would love to see your automated watering system, it looks really elegant on Insta.

Your videos are soo high quality, how u can have soo less subscribers? :O

What kind of aluminum extrusion are u using? Thanks!

5:17 the slight movement is from the teeth not meshing 100% between the belt and gears. If the belt tooth is resting on the gear tooth not between the gear teeth, a minor force like your finger will cause the teeth to slip into momentary alignment.

Nice. For my application backlash doesnt matter so i hope the gears last enough. But I'd i have issues i can do this. Seems cheap enough for my project

Very nice! May I know, how long closed loop belt did you use?

Did you print it in PETG?

Did you upload the completed version to Thingiverse?

Emilos !!! Great Video and Excellent explanation, I congratulate you on all your designs. I returned to refolmulate the question apology !!! Emilos, In the video I observe that the largest pulley has a bearing, does this pulley connect to the motor shaft? Why not design them completely separately? It is a question that I have about transmissions !!! Best Regards Rafael Matheus

BigTreeTech got more advance method using magnet place behind the shaft

Please help me, I simply can't design gt2 gears, can you share any directions?

SIR PLEASE UPLOAD YOUR NEXT SENSOR VIDEOS ITS VERY FOR ME AND THANKYOU FOR THIS VIDEOS

Good first video, with a good quality but I do have some remarks though. I'm sorry but it still clearly has backlash. It's also very hard to say/see if you have more or less backlash because of your gearbox then before. Note, zero or NO backlash is actually hard to achieve. To have a good comparison you would actually need to test the backlash without your box, with the metal arm directly coupled to the motor and then while connected to you gearbox. You can get a suitcase scale or some other type of scale, or simply some fixed weights. Then measure the deflection when applying the same force and compare. This would provide much more tangible results than you saying that you pushed rather hard as that tends to be really subjective and hard to judge/understand. Now this still wouldn't represent backlash perfectly (as it's a dynamic thing and deals with hysteresis) but it would be a decent starting point. Also with belts you will never be able to achieve zero backlash because they are flexible by nature, there's a reason why CNC machines, especially the more accurate ones use ballscrews and not belts like 3D printers. So that flexibility you mention might be because of the belts more than it being 3d printed maybe (hard to judge). Still even if it was all metal you would still have backlash because of the belts.

Great video ! but this design doesn't really reduce noise as you mentioned, there is plenty already. the vibration of the stepper transmits in the belt and into the system and still releases a high noise level, as opposed to a planetary gearbox for example..

what is the payload ?

This is great Job 👍👍👍 Could you please upload the tsl files?

Hi Emil! I'm working on a final graduation project to become an electromechanical engineer. May I cite your video as inspiration? I have developed a gear reducer similar to yours for use in a plastic tensile testing machine I am designing. It's for a NEMA 24 motor with a torque of 12Nm and uses XL type belts. Looking forward to your response. Thank you!

Great video! Do you do some professional film speaking or so? You have a clear and good voice! Cheers.

why dont use harmonic drive? more compact and already maked.

Beautiful. However I don't quite understand now two sets of gears each having a 1:5 one gear ratio in series give you 1:6.25

One of the things that stepper motors offer per se is the low backlash, that is the reason that they are mostly used in direct drive, I thought that by no backlash you meant you used a cycloidal gear, or harmonic drive or even a duplex worm gear.

it has a very finitely stiff drive train though

I think you would be interested in a cycloidal drive: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--065J34xC5o.html

Это плохой редуктор. Самый лучший редуктор циклоидальный.

Maybe too late for a comment but the background music was horrible and disturbing and unable to concentrate on the main video.