Pipe applied to helix wireframe looks to be changing diameter why?

[Steve1]

Hi.
V5
having drawn a helix in a normal manner, axis start then end then type in pitch and drag to diameter required.
the result in shaded after having used pipe command, where one can see a darker line for the pipe, and certainly in wireframe shows pipe spring wireframe varying in diameter.
The spring in shaded looks ok, as does the blue original helix used.
whats going on ?

pipe variable look.3dm (1.8 MB)

Cheers

Steve

[Helvetosaur]

That’s because the “wireframe” - which is actually the pipe seam - twists as it runs around the helix. Nothing to worry about.