Help with Drafts.

[SB_6660732]

When trying to apply draft on surface styled parts, or can say class A surfaces, Creo is not allowing to apply drafts. What could be the reason. Here I am considering plastic parts which have a wall thickness.

I think, drafts can only be applied on surfaces which have 90 deg relationship to the reference plane or surface which we are considering the parting line.

[kdirth · Accepted solution]

Draft does not work on surfaces that are not "flat" in the draft direction.  Class A surfaces are typically curved or warped in both directions and Creo cannot apply draft to a surface that already has a varying slope in the draft direction..

[SB_6660732]

Thanks a lot. That was very helpfull.

[tbraxton]

Using the draft feature function, you can draft any planar surface, cylinder, tabulated cylinder, cone, or ruled surface, except for those that are perpendicular to the pull direction.

Many styled surface features are not one of the types listed above, so you are not able to use the draft feature. 

When creating surfaces, you would want to build the draft into the surface features themselves. I would strongly suggest that you define the mold split(s) and reference the required draft pulls when creating any geometry in your model. This is critical on complex geometry that must eject from a mold.

[SB_6660732]

Lots of thanks. That was really helpfull.