X-Axis Stalling on Y1 Rail getting misaligned

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey tKC,

@Aiph5u

here are these support documents for checking the possible causes one by one:

• Troubleshooting: Rail is getting hung, stuck, or out of alignment (x35/x50 machines)

@Aiph5u

is your machine properly rectangular (“squared”) (bar gauge) and coplanar (“not twisted”) (fishing line method)? If not, this could among other things affect the Y axis movement where the Y carriages can block.

@Aiph5u

1. If your machine after homing shows a gap between the linear bearing (the big chrome-plated cylinder that sticks out the Y carriage) and the black front foot block on one Y side, but not on the other, l would first check if the distance with which the linear bearing sticks out of the Y carriage towards front is the same on both sides (same on left Y carriage as on right Y carriage).
   
   Image 1: One of two linear bearings used in a Y carriage.

They are held with grub screws and it is not impossible that they are not equal.

→ If you finally measure the “gap”, don’t measure this gap, i.e. measure not from linear bearing to black front foot block, but from (black) Y carriage block to black front foot block. (by the way, one of the purposes of Bill @Machinist’s Stops for homing is that on stall homing, it bumps against carriage block and not against linear bearing)

2. Did you already check your machine for rectangularity, like → described here ? If you didn’t yet, please do it now. If then still there is a different distance between (black) Y carriage block and (black) front foot block on one Y side than on the other, you can do this:After you ensured that both diagonals are perfectly equal, then you can do the following:
3. Shut down the CNC controller.
4. Disconnect both Y stepper motors from the controller.
5. Loosen slightly the four bolts on the top of every Y carriage that attach the X rail to them.
6. Move both Y carriages towards front until they both touch the front end.
7. Retighten the eight bolts.
8. Restart the controller.

Note that stall homing is by itself known not to ensure accurate homing repeatability, so retrofitting limit switches (e.g. with inductive proximity limit sensors) is a good improvement for any Original/X-50/PRO Onefinity machine.