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  1. 01-04-2012 #18
    Jonathan's Avatar
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    Jonathan
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    Quote Originally Posted by JAZZCNC View Post
    Sorry Jonathan that's Rubbish total utter rubbish they don't compare in any way.!
    Sorry I should have been clearer, I meant the accuracy of the straightness of the rail, not the tolerances they are machined to. Obviously I agree that overall profile rails are machined to much better tolerances and thus by far the most accurate rails. Round rail bearing blocks and supports are merely extruded.Sloppy - i.e. clearance not preload which is exactly why I'm replacing mine. Simulation of a realistic gantry, same as in first post except both rails and 10mm aluminium plate stuck on the back, forces in X and Z and constrained at the ends:

    Click image for larger version.  Name: SBR20 900mm z200N x50N dual.jpg  Views: 3126  Size: 268.0 KB  ID: 5622
    Last edited by Jonathan; 01-04-2012 at 08:04 PM. Reason: Wrong image
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