Hello,
I want to upgrade my 6040 Z+S with a rotation axis. I see many Chinese products and they are apparently selling but there is very little information about how good they really are, what are the limitations and the and best usage practices, what is the recommended maintenance.

I'll appreciate if anyone can share some experience.


I'm focusing on those products that use a harmonic drive with 10:1 or 100:1 ratio.
My router has a very limited Z axis. Travel is 75mm and the leadscrew nut is just 95mm above the router table. If the chuck axis is 65mm above the surface and is parallel to the Y axis, workpiece will be limited to 60mm diameter.

I found a seller on Aliexpress that advertize chuck center height of 55mm (link) which would be better for me. I did not see any similar products from other sellers. I will try to contact him for more details.

Thanks,
Itai