Version 4.20 X Axis Soft Limit Not Working < solved, lathe diameter vs radius >

[carbuthn]

For some reason the soft limit on the X axis (axis 2) is not working correctly (Stopping travel).

The X + limit (set at zero) stops the drive in the positive direction at zero indicated position and before tripping the mechanical limit switch or the home proximity switch (as it should), but in the negative direction (soft limit set at -3.0") it will not stop the X axis before tripping the mechanical limit (set at 3.3").

I have tried different settings (-1.0, -2.0 etc.). Down powered the Acorn and CNCPC but it doesn't want to work.

The soft limits on the Z axis work as expected and will stop travel before reaching the mechanical LimitAll switches.

This issue is kind of duplicated in a post "Yet another Techno Isel Lathe Refit Using Centroid Acorn and Teknic Clearpath Drives" but due to the title may have been missed.

Can someone verify is this a bug or have I just missed something? I am seeing it only on Axis 2.

[cncsnw]

On a lathe, X axis travel limits are in actual travel (radius amount).

A limit of -3.0 would let you move -6" on the DRO, because the DRO is showing you diameter (twice the actual travel).

[carbuthn]

Thanks CNCSNW,

That makes sense, the problem may have occurred while trying to calibrate the axises. I watch the video that Marty had made, Calibrated the Z axis, Checked the X axis and found that the movement was only 0.5" for a 1" commanded move.

Scratched my head, and changed the overall turn ration from about 10 turns per inch to about 20 turns per inch so that I was moving to within 0.001" of commanded move.

I will redo so that the overall turns is about 10 turns per inch again.

Chuck