By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Harmonic drive.. Because I need another project...

All Topics | Latest Posts

Search for:  in Thread Title in  
sam sokolik26/01/2021 16:38:12
76 forum posts

Thought this would be a neat experiment to see if a minimally printed harmonic drive would work (for some definition of..) Just printing the flex and outside gear.

Martin Connelly26/01/2021 18:01:19
1660 forum posts
179 photos

Some torque wrenches have plastic harmonic drives in the adjusting mechanism to drive the scale round.

Martin C

sam sokolik28/01/2021 04:23:30
76 forum posts
Joseph Noci 128/01/2021 06:05:52
852 forum posts
1051 photos

Nice work Sam. I have been searching for a small, low power ( sub 1Nm) 'zero' backlash gearbox and have been looking into these types of reduction boxes, as well as the cycloid reducers. The latter seem to be easier to machine but not so easy to achieve a few arc-minutes backlash! I built a 3D printer using Polar co-ordinate arms and the interface between my steppers and the arm pivot is only 10:1 . The steppers have a 6400 microstep resolution, so I was hoping it would all work - Does not..Some arm positions result in perceptable print nozzle 'wobble' as the motor step is not small enough. So I need to reduce down another 10:1 or more, and the printer mechanical structure makes it difficult to add such a reduction - hence looking into a small inline strain wave reducer. The cost even for such small ones is not insignificant. Not sure a 'printed' version will be good enough for my application though. Certainly looks good and amazing what the 3D printer has achieved.

The pics below just to show where the reducer would have to fit.



left view.jpg


arms closed mockup.jpg


gear train.jpg

Edited By Joseph Noci 1 on 28/01/2021 06:06:59

sam sokolik20/02/2021 04:40:40
76 forum posts

started an actual 4th axis........

sam sokolik23/02/2021 05:23:10
76 forum posts

and another update...

Michael Horner23/02/2021 07:19:09
215 forum posts
61 photos

Interesting stuff Sam.

Is this something you are going to use?

If nothing else it made me look it up on Youtube.

Cheers Michael.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
JD Metals
Eccentric July 5 2018
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest