Re: Chinese Ebay 4th axis Harmonic Drive
Hi Rey8801
While you are at it, you might like to read this stream:
Build Thread The Design and Construction of a 'Backlash-Free' Rotary Table
It is about a rotary unit I built using a larger HD unit. I got into some detail about calibration and measurements.
Cheers
Roger
Re: Chinese Ebay 4th axis Harmonic Drive
yeh I am now asking all the shops selling this type if they can check their unit and see if they have the same problem. I hope by getting the reply from different sources will lead to the truth! Thanks guys. I will for sure return my "free play HD" ahahah
Re: Chinese Ebay 4th axis Harmonic Drive
Just show them the vid you shown us, its pretty obvious this shouldn't have shipped out at the first place. Sorry it came to you that way... f n frustrating to watch in fact.
G'luck man.
Re: Chinese Ebay 4th axis Harmonic Drive
I will report her eback if I get it solved somehow. Thx
Re: Chinese Ebay 4th axis Harmonic Drive
I have the same 4th axis long time ago ~4 years. Also have this problem when just bought, but not as serious as yours. The manufacturer uses old harmonic drive in it...
Re: Chinese Ebay 4th axis Harmonic Drive
I think that was the problem. Now I am getting a replacement and by the video the supplier sent me there is not play anymore. Fingers crossed
Re: Chinese Ebay 4th axis Harmonic Drive
Interesting. Criticism of 'Asian rubbish' is easy to make, but I have found that a lot of (ebay) vendors are actually quite concerned about keeping their customers happy. There have been a couple of exceptions, but some of the others have been very good with reliable stuff. CarbideChiu on ebay has given me very good service over the years.
Cheers
Roger
Re: Chinese Ebay 4th axis Harmonic Drive
Quote:
Originally Posted by
RCaffin
Interesting. Criticism of 'Asian rubbish' is easy to make
Well, it's not so much being Asian rubbish... but more that we are talking about a toy... and a cheap toy at that. Try buying a small Haas rotary and see how many thousands you will have to pay.
Re: Chinese Ebay 4th axis Harmonic Drive
Got the replacement. For the moment it seems without backlash, before I could swing it for like 5-6mm left and right. Fingers crossed.
EDIT: Here the video I was talking about
https://youtu.be/iy6l19QHkNs
1 Attachment(s)
Re: Chinese Ebay 4th axis Harmonic Drive
Just to conclude the thread. I have been using the harmonic drives a couple of times. I can confirm that it works fine. No backlash, with the 4 indipendent chuck you can 0 the runout and it does what I want :-)
https://www.youtube.com/watch?v=OsJ89-TaObA
Final result. Herringbone gear
Re: Chinese Ebay 4th axis Harmonic Drive
Hi,
I just ordered a Chinese CSF-32. It's on the way to me.
Are you still using yours?