Re: Shafting

--- In CAD_CAM_EDM_DRO@y..., Gene <capper@i...> wrote:

> Im thinking of using 1.250 shafts to span 6' and 1.00 to span 48" on a
> cnc router. I am wondering if that's big enough or if I should go
> bigger? any thoughts would be appreciated. thank you.

There are alternatives to round shafting and linear bearings, which may be practical for you to consider.
In the files section of the CAD_CAM_EMC group

http://groups.yahoo.com/group/CAD_CAM_EMC/?yguid=125450587
are drawings of a mill\router using square section rails with cam followers instead of linear bearings.

It's also feasible to use bronze or plastic slipper bearings with flat material, which could even be hollow section rectangular tubing which should be sufficiently dimensionally accurate for woodworking.

Regards
Bob Thomas