Hi,

I'm designing a transmission and want to connect two shafts using a polygon connection (P3G DIN32711). The geometry is defined by the following parametric curves:

(R_m - e*cos(3*t))*cos(t)-3*e*sin(3*t)*sin(t)
(R_m - e*cos(3*t))*sin(t)+3*e*sin(3*t)*cos(t)

with e = 8, R_m = 90, t element of [0, 2*PI].

I could successfully generate the right curve with the equation driven curve functionality, when I gave