NEMA 17 Gearbox with NO backlash!
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- Опубліковано 4 кві 2020
- This is my design of a Nema 17 gearbox which reduces the backlash to a bare minimum. The idea to use gears and belts is of course neither new nor groundbreaking, but I couldn't find a gearbox design like this, so I decided to make my own.
This is just the first prototype and there are many things I will like to fix in the next version, so the CAD files won't be uploaded just yet.
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/ emilostuff - Наука та технологія
Great design, outstanding presentation! Looking forward to your future videos!
Thank you so much! Much appreciated :)
Superb. Love the design and the video too. It’s to the point without any waste of time :-)
Thank you very much!
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.
Great start here on UA-cam. Great introduction and constructive description of the project. There you can learn something from! Look forward to much more good videos!
Thank you very much, Jens! I’m happy to hear that 😊
@@Emilostuff Hello. Is the updated designs finished? Can you share the project files? Thanks in advance...👍
Very nice design and idea, good work!
Love the sound of the thing
Great video. The production quality is excellent
Thank you very much! :)
Dude, you're very cool and explain in a really good way. Thanks ⭐
Thank you! Very much appreciated 😊
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.
Awesome, thank you!
The video is sooo professional! Sure this channel will go a long way. We are here to support you. Keep it up!
Thank you very much! I will :)
Great video!
Thanks!
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!
Hey! Thank you very much! Glad to hear that :) It sounds like a very nice idea to combine the two. I'm thinking that you should put the belt closest to the output shaft then - to allow for some slack in the strain wave mechanism without getting to much backlash
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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~))
Hey! Thank you very much for sharing your thoughts :)
I really agree with you regarding the belts. I think it's a great solution, but I don't know it will wear over time - we'll have to see. The belt however introduces a bit of flex, so in a future design, using stronger or larger belts might improve the behavior under load.
Nema attached encoders are a great idea. In the second version of this design, I'm using a hall effects sensor for zeroing - but this could be a future upgrade!
BLDC's? I'd love to try working with those for robotics, but I haven't decided to make the investment yet (either oDrive or a similar product).
@@Emilostuff
You could experiment by using a drone ESC and drone BLDC
Those are really comfortably cheap and pretty powerful - they just have a LOT of speed instead of torque, so maybe not the best for a more precise system...
I think Encoder+regular stepper is the best way to go for now.
Brushless gimbal motors could be an option.
Great video. An inspiration for my channel.
Thank you so much! Happy to hear that 😊
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.
Please help me, I simply can't design gt2 gears, can you share any directions?
Near perfect design, did you update the design?
Your videos are soo high quality, how u can have soo less subscribers? :O
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!
what is the payload ?
Please make more robotics videos :) Also, would love to see your automated watering system, it looks really elegant on Insta.
Noted!
Did you print it in PETG?
Very nice! May I know, how long closed loop belt did you use?
Thank you! They are 200 mm long, 6mm wide, 2mm tooth pitch GT2 belts :)
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
Hello Rafael! Thank you very much! Yes, the largest pulley (the output) is resting on the motor shaft - I did this to save space. I could just as well have omitted the bearing, so they wouldn't touch, but I thought it was at neat way to improve the stability of both the motor and output. If they were to be separated, the gearbox would get more of a triangular shape. I wanted to make it as compact as possible, so this was the best solution I could find :)
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
BigTreeTech got more advance method using magnet place behind the shaft
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.
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!
why dont use harmonic drive? more compact and already maked.
SIR PLEASE UPLOAD YOUR NEXT SENSOR VIDEOS ITS VERY FOR ME AND THANKYOU FOR THIS VIDEOS
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..
This is great Job 👍👍👍
Could you please upload the tsl files?
Thank you! I'm currently working on a new version, that will fix all the issues I had with this one. The video will be up sooner or later and I'll be publishing the stl-files for it then 😊
Thank you very much, I wish you more success.. ☺️☺️
Great video! Do you do some professional film speaking or so? You have a clear and good voice! Cheers.
Oh, yes, I just read your description. Interesting!
Thank you so much! Yes, I have actually done some voice-overs a couple of years ago, but those were in danish, so this is my first time doing english :)
I'm very glad you like the video!
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
It is 2:5, and a pair of these sets gives (2:5) x (2:5) = 4:25 = 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.
Which motors have backlash?
Это плохой редуктор. Самый лучший редуктор циклоидальный.
it has a very finitely stiff drive train though
I think you would be interested in a cycloidal drive: ua-cam.com/video/-065J34xC5o/v-deo.html
Maybe too late for a comment but the background music was horrible and disturbing and unable to concentrate on the main video.