how to make a flat helix curve in Pro/e

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

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.

Hi Thoma

make curve form parametric equation

For a helix with a r=5 and a height of 3

x=30*

y=5*sin(6*t*360 z=5*cos(6*t*360

regard

I've been searching and searching manuals etc., no luck