twisted

[riverracer]

hi all,
i am trying to do a simple curved plastic runner gate (v small only bout 3mmx5mm) but i keep getting a twisted edge along 1 side.
the 2 profiles are the same shape, just different sizes, both with 3 lines and 1 arc.
it looks ok if i remove the 2 top lines and do a surface on the 'U' shape. but if i try a surface loft with the top edge i get 1 sharp side and 1 slightly rounded.
if i do it as a solid, the distortion is more pronounced along the edge.
i have tried picking in different spots, but that just shifts the distorted edge.

what am i doing wrong? something simple i bet !!

thanks

the jpg shows 'U' surface loft, surface loft with top line, solid, basic shape.
zip is file in x4mu3

[Superman]

Have you tried using "Create Ruled Surface" ( both chaining the same direction, and the same respective start point/corner ?
You could also try breaking the "top" line at the mid-point, and then chaining from there, to eliminate the "roll" around the corner.

[riverracer]

Have you tried using "Create Ruled Surface" ( both chaining the same direction, and the same respective start point/corner ?

yes, have tried different lines and directions as well, always both in the same direction.

You could also try breaking the "top" line at the mid-point, and then chaining from there, to eliminate the "roll" around the corner.

tried that as well, tried on the arc as well, but that threw other problems in.

i have done the job at work using the surfaced 'U' without the top line, but i was wondering why i karnt get this to work.
if i pick from the other side it places the mismatched side on the other side.
i have even redrawn the profiles.
must be me, ah well next time