If the Iglus bushings work well with the stock rods there is really no reason to change them.
Bushings mainly need the right diameter tolerance of the rod, and an accurate geometry to prevent binding.
The MK2S rods are hardened and ground steel rods and are actually quite good!
The igus aluminum shafts are anodised aluminum, which has a hard, silky smooth surface.
Their tolerance is h8, meaning they are between 8,00 and 7,978 mm thick
They are NOT suitable for ball bearings, as their hard coating is much thinner and softer than hardened steel and the aluminum underneath is too soft to support ball bearings.
The hardened misumi rods are again a lot harder, which is really needed due to the extremely small contact area of ball bearing balls.
The tolerance is even tighter at h5, which means they are between 8,00 and 7,994mm.
However - the tight tolerance of the Misumi rods might be a little bit of a waste for use with Igus bushings, considering the fact that bushings have a slightly larger diameter (play) anyway to allow free movement. But if you ever change back to ball bearings, those rods will be perfect.
If you do change the rods please post your experiences. It's an interesting subject and every experience counts.
Last edited by georg.s2
on Sun Nov 19, 2017 9:22 pm, edited 1 time in total.