Quote Originally Posted by TonyD View Post
Only concern is that the block is 260mm in length right now and thats a fair amount of X Axis travel I'm eating up.
The deflection due to the bearings on each axis is inversely proportional to the linear bearing spacing squared (which is obvious from the formulas in the Hiwin linear guide datasheet), so increasing the spacing by a relatively small amount can make a big difference. That's why it's important to space the bearings out as much as you can afford to, assuming the part they are mounted on is strong - which currently isn't the case as it's just a plate which would benefit a lot from a triangular/trapezoidal piece on the side. 260mm is not bad...probably not much point going above 300mm as other parts of the design will have a greater effect on the overall stiffness.