Seems to me that the design above ( very similar to the machine I’m building) introduces primarily radial loads to the bearings. I’m not an engineer, but I would think that in a round shaft design there would be no lateral loading on the shaft.
As for your Y axis design, Shopbot makes a router with a similar Y axis. From what I have read on the Shopbot forum, there have been some issues with poor torque stiffness in the Shopbot Y axis, but this may be a function of the components used in the Shopbot rather than design. |