New Member

[01012f]

Hi all

I'm struggling with the linear rails I bought for my project.
How easily should the carriages move on a HGH20 rail?

My 3d printer has 12mm linear rails and the carriages fall freely when the rail is held vertically. I was expecting similar for the HGH20 rails but they just sit there. Even removing the wiper plates there is no roll although they do move with a light tap but then stop immediately. Is this normal?

As a test, I replaced the HGH20 rails with some Sbr16 rails and they work fine, even when I attach my end plates and gantry and my stepper motors easily move it all.

Have I bought the wrong rails? Am I expecting too much of them?

Thanks

[JAZZCNC]

This is quite normal, it's the preload that is holding them. The preload is one of the details which makes them so much better than the others. You don't want loose sloppy rails on your machine and any bearing that slides easily without any effort is basically sloppy.

Don't hesitate to fit them and forget, they will outperform and outlast all the others.