Cold Fusion, is you don't have the rails yet, don't discount using THK types rails and ways.
Especially if deflection is a concern, THK rails solve this problem.
Also, you don't need a very big rail, a 1/2" THK is stronger than a 1-1/2" round rail. (For load ratings)
That will keep your costs down. I've seen these on Ebay fairly regularly.
I also agree with the 4 bearing concept as being almost mandatory. Especially on a machine as big as yours. Check the Thomson website for shaft deflection. It's a different calculation for a two bearing load versus a one bearing load.
Good luck. |