Hi all,
Does anyone have any suggestions or links to methods of calculating the spacing required between linear bearings on each rail on an axis?
That is, if you have an X axis of, say, 24" with a rail on either end, and using commercial linear bearings, what is the optimum distance between the two bearings on each X axis slide? If you have the distance too small then there's greater risk of binding, too far and the machine get's too big for a given cut area. Make sense? So how do you decide what that distance should be?
I've some information on Igus Drylin T and THK Linear slides. Working out the loads and dimensions for a prospective 36"x36"x6" cut area machine with a 3.25 router etc etc the info suggests a bearing spacing on an X rail of 14-18" for Drylin T 20mm and 10-12" for the equivalent load size THK.
From the machines I've seen here people are using less spacing. From some commercial machines, they use significantly less. The few high end vendors appear to use wider spacing more in line with my 'guesstimate'
Any thoughts?
Anyone comment on the use of Igus Drylin T or W?
cheers,
Andrew