Unable to project curve onto sketch

[CJ_10462864]

This may be a somewhat silly question because I'm relatively new to Creo, but for some reason I can't project my equation-defined datum curves into a sketch. I have followed the support page for this exact process but when I try to select the curves for projection into my sketch, nothing happens and the curves aren't selectable in the modeling window. 

For reference, I am using Creo Parametric 7.0 and am trying to design something defined by epicycloid and hypocycloid curves.

[StephenW]

Are you trying to use an existing curve as a reference or are you trying to project on to a plane or surface?

I tested with a simple circle by equation and was able to use project in the sketch and I used Project in the model modifiers tab.

Did you test with something simple to make sure the process was good?

Maybe a screenshot would help or a link to the support page you were using would help

[CJ_10462864]

This is the support page I was using: To Project a Curve into a Sketch (ptc.com)

I am trying to project some existing datum curves into a sketch so that I can make an extrusion using them. I tried projecting them into another plane, using them as is, and pretty much everything I can think of and none of it has worked.

This is where I run into problems when I follow the suggestions on the Creo support page: I select the curves and they don't show up so I can't use them.

[tbraxton]

If you are using a commercial license, can you post a model with the curve from eqn in it so we can investigate it?

[CJ_10462864]

It won't let me post the part file, but here are the equations that I am using.

[tbraxton]

Using your epicycloid parameters from 0-180. I am able to project the eqn curve in sketcher as seen here.

[CJ_10462864]

Describe your process to me. If it isn't an issue with my formulae, it's either with my process or with my configuration.

[kdirth]

I was also able to get it to work.

Started a sketch / Selected Project - Single / Selected curve from screen.

I did this on a parallel plane and a rotated plane.

[tbraxton]

What domain are you using when defining the epicycloid? See example below.

[CJ_10462864]

I am using Cartesian coordinates and I am defining it from 0 to 90 just like you are.

[tbraxton]

If you compress your part into a .zip file it should let you upload it. I need to see the model to interrogate it.

[tbraxton · Accepted solution]

This is what you want to use the projection for? Unhide the layer with the curve and you should be able to see and project it.

[kdirth]

Are the datum curve off screen in the screen shot?

If they are hidden, they can't be selected.

[tbraxton]

I just tested this in Creo 7.09. I have a dtm curve from eqn feature in the model. I am able to project this curve in sketch mode for use within sketcher when creating a sketched datum curve.

[kdirth]

I would guess that because your equation curve has "vertices" Creo cannot use is it in a projection.  You may need to create copies of individual cusps to use the projection feature.  You might also want to consider creating only one cusp and patterning it.