My new 6040 improvement plan.

[magicniner]

Aren't those just grub screws holding the bearing cartridge in place? I don't see how those would do any adjusting on the bearings other than distorting the casing or possibly forcing things out of alignment slightly.

Tighten them enough and whatever is under them will eventually apply more pressure on one side of the rod, it isn't an engineering solution but if it works then the only remaining problems are wear and those floppy pesky unsupported rods ;-)

[PaisleyPCdoctor]

The main gain was in Y-axis bearings.

They are adjusters. When they are tight, there is no noticeable flex/movement on the gantry. I tighten til they stop, then quarter turn to nip up. Gantry feels rock hard.

When I loosen the grub screws, the gantry flexes as if it's on rubber mounts. Difference is remarkable.

I'm just left with the flexing of the 20mm unsupported x-axis shafts. There's a youtube video where the guy replaces them with supported rails, but improvement was MINIMAL at best. Waste of time.

I have a better, cheaper and easier solution. Just sketching out the plan and I'll post it.

[Kev2960]

They’re probably just plain linear bearings and the screw just stops the bearing rotating or moving in it’s housing.