SBR20LUU seal interference

[Lee Roberts]

Hiya, yea just found your other thread about rebuilding it (Rebuilding terribly engineered laser cutter) so got a better idea what your dealing with now...

You can't take the rubber seals out as they keep the balls retained but you could trim the outer most part that is bending, the bit that rides the rail and stops swaf getting in.

Non of the ones I've handled had this problem and I've handled quite a few!, I'm wondering if they've used the wrong size rail and that's the real problem, can you mic the rail and get a proper dimension off it ?

If you look at the rubber seal on the ends of the bearings (where the snap ring lives) it should give you the sizing, something like SBR12UU.

They may have done something stupid like used 12mm bearings with 1/2" rail... I could be wrong.