Those self lubricating bushings tend to have a relatively large amount
of backlash, especially after a bit of use. Ball type bushings work well
even in dusty environments as long as you keep them greased. As the
rails are very smooth rubber wipers will clear the dust very effectively.
I on not keen on the round type bushings. They have very high point
loading between the balls and rails. On heavily loaded rails such as the
X axis you start wearing grooves in the rails. Rectangular rails have
much lower contact pressure because the grooves are close to the same
shape as the balls. My router uses 2" diameter round rails and even
those have deep grooves worn into them. Admittedly this machine is 30+
years old.
Les
On 28/04/2019 20:30, Leonardo Marsaglia wrote:
There are some open type bushings. But I don't know how the will behave.
Just curious about them.
https://www.aliexpress.com/item/OP-JDB-304564-copper-sleeve-the-same-size-of-LM30-OP-linear-Solid-inlay-graphite-Self/32310066889.html?spm=2114.search0104.8.38.28173ea0iA8XJ7&transAbTest=ae803_3
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