how to make a flat helix curve in Pro/e

I've been searching and searching manuals etc., no luck.
Anyone out there who knows how to make a helix curve without pitch, just a
flat spiral?

Thomas

 

Datum curve from equation, cylindrical coordinates

r = IR + t * (OR - IR)
theta = t * 360 * #T
z = 0

Where:
IR = Inner Radius
OR = Outer Radius
#T = Number of Rotations

(That's the formula published in a PTC Suggested Technique article. I have
no idea what the curve is, but would guess it's an Archemedes spiral(?).)

 

Hi Thomas,

One solution would be to create a DATUM CURVE from equation, choose a
coordinate system and then enter these parametric equations that are
function of the parameter t (except the z equation, since you want a spiral
and not an helix):

x=t*cos(360*6*t)
y=t*sin(360*6*t)
z=0

The parameter t varies from 0 to 1. Hope it helps.

Pablo,

 

I forgot to tell that for these equations you need to pick a cartesian
coordinate system.

Pablo,

 

Hi Jeff
Thanks! It works. However slightly more complicated than in fx. 3D Studio
Max!

/Thomas

 

....slightly more complicated than in fx. 3D Studio Max!


8~) Yes, 'tis.

I'm such a dullard when it comes to math; I keep thinking I should try to
find the template sheets that Pro brings up for equation driven curves and
copy equations to them so I don't have to look them up or copy from a cheat
sheet. Anyone happen to know if that's possible and what the template file
names are? Anyone got a good equation cheat sheet made up they want to
share?

It's sort of interesting, too, when you get time to play; create a helical
swept "ribbon" surface (not "Ribbon Datum") using something other than a
vertical line for the Swp Profile and project an edge back to the axis
normal datum plane.