3D Line equation not plotting correctly

[RobertWK]

I'm attempting to create an equation curve that is a sine wave that follows a circular path in the cartesian coordinate system with the following equation sets:

x(t) = (R + a*sin(n * theta)) * cos (theta)

y(t) = (R + a*sin(n * theta)) * sin (theta)

But I'm not getting nearly the results that I desire.  I'm attempting to replicate this:

http://bencrowder.net/images/2013/05/SineCircleTest-002.png

Any ideas?

[WHolzwarth]

Here we go.

I don't know, why one sketch dimension is told to be missing. That doesn't make sense to me.

😉 Johnson, are you watching?

Walter

[RobertWK]

Is there any way to get a 2 distributions of equal amplitude on both sides of the circle from 0 to 90 degrees (or 0 to 45 degrees)?

[RobertWK]

I'm essentially trying to do this as a 3D sine wave around a circle that spins down. Kind of like this, but more uniform.

[RobertWK]

The problem I'm running into is that the sine wave isn't consistent enough around a curve; it doesn't have equal amplitude and getting it to follow the circle path is proving to be excrutiating.

[johnsonshiue]

Hi! Walter,

Indeed, the one DOF does not make sense. I do not have good explanation for that. I will need to forward it to a sketch developer.

Many thanks!

[WHolzwarth]

Thanks back for watching, Johnson