Homing Y-axis delta

[johnwillyn (JohnL)]

I know the topic of homing precision and repeatability has been covered in depth here, but my issue is a little different. I have read many of the threads on homing (and truly appreciate the depth of these discussions).

When I home the machine (after a boot up), the Y axes don’t seem to home to the same offset after the stall. I assume this is because one side of the machine is stalling before the other, but I am not sure why or if there is anything I can do about it.

I have measured the gap between the front rail mounts and the bearing (with feeler gauges) and the delta can be 1/2 mm or slightly more after some homing processes.

I am wondering if this is contributing to some of my out-of-square issues, but generally want to know how precise and repeatable these operations are.

This is on a WW Pro, and I know the Elite uses an entirely different mechanism.

Thanks in advance,
JohnL

[Geige (Tom Wert)]

Before you setup your Woodworker.. an alignment guide

I’m somewhat new to this community, but huge thanks for the many helpful folks here. Nick created this thread to share how following the recommended setup can still result in an out-of-square machine. Huge thanks to Nick and the discussion there, but it seems most of that thread was people who found out their machine was a parallelogram AFTER already setting it up. (I cut a full grid into my waste board before realizing it was not square… oops) So this thread it hopefully to catch folks BEF…

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

Hey John,

• How to realign the Y rails (x35/x50 machines)

@Aiph5u

have you ensured that your machine is rectangular (“squared”) (bar gauge) and coplanar (“not twisted”) (fishing line method) ?

In both cases if it is not accurately adjusted, not only you can get parallelograms instead of rectangles, but also workpieces with a twisted surface. Surfacing the wasteboard will not help against lack of coplanarity (twisted machine base), the machine will only reproduce the twist on the workpiece surface. Also if any of both is not accurately adjusted, the Y movement can block.

[johnwillyn (JohnL)]

Thanks for sending this Aiph5u!

I have read a number of your posts on homing (e.g. Homing != Zero), and have a much better understanding of the issues, precision and inconsistencies involved with homing. Thanks for all of your posts, particularly the gcode snippets for saving/restoring posteition information.

Just yesterday I decided to do a partial tear down of my 1F WW and “reset” all of the rails. I set up a test bed (with a wide, square piece of Baltic Birch) and jogged the machine to each of the corners with a 30d v-bit to mark the corners.

Everything seemed to be spot on after the adjustment. The diagonals measured 1154mm each, as they should.

I am going to do some more testing, but I think I now have a setup where I can set up a fence to calibrate and adjust as needed.

Thanks again,
JohnL