Hollow Shaft Servo Motor

[Eric R.]

Dear All,

I am currently designing a large moving gantry milling machine. For the X-axis (approx. 5' / 1.5m) I will use servo driven rotating ballscrews (double axis configuration). For the Y-axis (approx. 10' / 3.0m) I want to use a fixed ballscrew with a rotating nut. As I prefer not to use belts, I would like to use a hollow-shaft servo motor with a large bore (approx. 2" / 50mm). The only problem is that these are hard to find and if available, way too powerful and very expensive (> 2000 USD). Therefore I am planning to build my own hollow-shaft motor based on a frameless motor kit. Anybody out there that already has experience with this? Or would anybody be interested in such a hollow-shaft motor? In that case I am more than willing to share my ideas.


Kind regards,

Eric

[Al_The_Man]

Frameless motor help can be obtained from Aerotech as well.
The only problem I can see is can you guarantee the integrity of the armature spacing due to BS whip or eccentricity?
Al.

[Eric R.]

I will have all parts made with high-precision tools, but tests will tell.