Hello!

I have just received the harmonic drive. I read before and I was aspecting a gapless drive, with no backlash. Now I ma new to harmonic drive but if I try to move the chuck by hand it has a play of like 4mm back and forth. Does it come from the harmonic drive or it something else? How can I get rid of it? I do not find anyone else with a similar problem.

Here the video showing the problem https://www.youtube.com/watch?v=uSB-UlZzBjQ

This is the type of harmonic drive. I have the 1:50 reduciton.

https://www.ebay.de/itm/3-Jaw-K11-10...8AAOSwJTNbvW2H

Thanks a lot! I need it to make helical gear and like that won't work :-(