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Problems with sweeps using surface edges

Problems with sweeps using surface edges

Problems with sweeps using surface edges

(OP)
Hello everyone,

Is it possible to have a surface sweep run along the edges of a surface made using a spline? The weird thing is that it works with a surface made with an arc.

In this example I'm trying to get a sweep along the edges of a surface made with a spline using the selection manager to select the edges:

http://files.engineering.com/getfile.aspx?folder=32dbe698-4a29-4e85-9cc6-7f6d3777f3c5&file=sweep_spline_-_fail.JPG

However, it works fine with an arc:

http://files.engineering.com/getfile.aspx?folder=bc3a04c7-8026-47a5-927c-bc9388ef50f5&file=sweep_arc_-_success.JPG

The failed "spline sweep" sw2011 file:
http://files.engineering.com/getfile.aspx?folder=904b7af5-b9ec-4575-9eeb-8072f4c2ca6c&file=sweep_spline.SLDPRT

How can I get it to work with the spline?

An additional question: the sweep worked fine using the arc, but why is it not possible to select the option "Twist along path"? SW complains: "to make this option valid, the sweep must have a smooth path". Isn't the surface edge smooth enough?

Are these simply limitations with solidworks? Is there another way to create this geometry?
 

RE: Problems with sweeps using surface edges

(OP)
OK, I've solved it, for the surface sweep, the start/end tangency type should both be set to "None", and to make a "twist along path", the rule seems to be all path edges need to be tangential to each other. Presumably, that's what is meant by "smooth".

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