Strange movement on sphere's helix

[[Ma...]]

Hello,

i have a strange problem.
I have defined a sphere with a helix path
But machine is scanning like this.
It starts and ends on right spot, but when it gets down then on every turn it goes to this location making it this "lasso eye".

I have tried recreating a new sphere, new path - still the same. Work around would be using pointset or curve to get form ( calibrated face ).

[[Ju...]]

Have you tried slowing the scan speed way down?

[[Da...]]

Not a fan of helical paths in general. Try multiple circle paths, works every time.

[[Ma...]]

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I did not, but it's not sloppy surface - it's R8,5 sphere scanned with R1,5 ruby.
I don't know how to post video here, but it seems like it get to certain angle, then it turns 90° to a point, then turn 180° back - all 3 went to same spot - no way to be a speed issue.

We have similar part where this strategy work normally.

[[Ma...]]

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I just wanted to scan fast all around with a little detail - we had some issues on surface so i had to use helix to cover move area.
Otherwise i would need to make some circular movements, transform it to curve and make a point set from it to make continuous scan.

I am wondering why this happened - similar part have no issues with this - same speed, points, probe, radius.

[[Ma...]]

I've made a video of a scan
https://youtu.be/N9TO4b0frDQ

Edit:
I found a glitch. I had a sphere approaching from -Y - so i set vector Y: -1 and helix start and end height were negative -> this strange movement.
Since I set vector to Y: +1 and heights in helix to positive -> normal movement.

Don't ask me how ridiculous was a path when I switched start and end height 🤣