Limited actions to a solid created by free from (?)

[gamelife4dns]

Hello,

I just realized that a body created using free form isn't like a body created by solid or surface modeling. I mean we can't select a plane surface from it to create a sketch, or create any construction planes, etc.
So how to use such body like any other solid body ?

Thanks.

Steve

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[gamelife4dns]

Attached a f3D file.
body1 is done with free form, Create/Cylinder then Modify/Fill Hole keeping crease.

body2 is simply done with solid cylinder feature.
Can not create a sketch on top surface of body1, can not create a tangent plane.

Can create a sketch on top surface of body2, can create a tangent plane.

What works is "Plane Tangent to Face at Point".

So I suspect the body1 cylinder is not a "real" cylinder. Section is probably not "circular" and top and bottom planes are not really "flat". Fusion can not see those as such ?

Thanks.

[jhackney1972 · Accepted solution]

The top of the body, created from the Forms Environment, is not truly flat so it cannot be used as a surface for sketching or construction plane creation.  I the video I trim off a little of the top to make a usable plane.  Model is attached.

[laughingcreek · Accepted solution]

t-splines create untrimmed nurbs surfaces, not breps.  they are not the best tool for creating  geometric and planner type objects.  that's what the regular modeling environment is for.

[gamelife4dns]

That was what I suspected. Still, it's strange but OK. Thanks.