Twisting Arc in Polar Array

Hi all,

Modelled this arc from 3 points in a polar array with PFrames along a curve.
It works fine at certain points along the curve but gets twisted at others.
Is there a way to avoid this?

any tips would be much appreciated

LGK (18.2 KB)

Yes, in some situation Frames could be twisted in a unpredictable way.
You can use “Align” with a vector pointing to the center of the main arc to give the same orientation logic to all the frames.
(I did rebuild your definition…)
LGK (16.6 KB)

Got it!
Thank you for your quick help and really neat rebuild Riccardo