topic Re: Creating a Multiple Chain Sweep in 3D Part & Assembly Design

Creating a Multiple Chain Sweep

dprobst — Sun, 13 Dec 2020 10:09:34 GMT

I have tried several times to produce a sweep that has multiple chains within the sweep command and have been successful.

As shown by the following image:

When trying to create the same type of sweep using two cylinders, one extruded higher than the other but both extruded from the same datum plane, I cannot get it to work.

See next image.

This is what I am trying to achieve. See next image

Any help would be appreciated.

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Re: Creating a Multiple Chain Sweep

dschenken — Wed, 04 Mar 2015 18:07:10 GMT

Imagine there is a plane that is perpendicular to each point along the origin trajectory. That plane needs to intersect the additional trajectory chains. In this part, where the large cylinder is, the additional trajectory chains do not cross or lie on the plane for the initial start point.

Change the primary trajectory to be coplanar with the start points of Chain 1 and Chain 2 trajectories.

Re: Creating a Multiple Chain Sweep

dprobst — Wed, 04 Mar 2015 18:22:27 GMT

Hello, David

Thanks for the information. I will try it out and let you know.

Re: Creating a Multiple Chain Sweep

dprobst — Wed, 04 Mar 2015 19:32:49 GMT

Hi David,

I did place all starting points on the same plane and made sure the ending points were also the same, but it still will not sweep correctly.

I have attached another image of what I get. I will says this much. If I draw a straight line from point to point on the bottom and then draw an arc (from each point) from the end of the line to the point at the top, it will sweep with no problem.

Just to clarify, I am trying to sweep a "Tee" cross section.

Here is the same part but with a different cross section and it sweeps fine.

Re: Creating a Multiple Chain Sweep

dschenken — Wed, 04 Mar 2015 20:02:52 GMT

It is missing an alignment to the point at the start of chain 3 to the line representing the top face of the inverted-T.

Change the sketch so the line segment is away from chain 3 and then manually change it to be aligned. There is an automatic assumption for a sketcher constraint that is currently controlling that segment.

Re: Creating a Multiple Chain Sweep

dprobst — Wed, 04 Mar 2015 20:12:31 GMT

Okay, got it. Thanks David for your help. I knew it had to be something not that difficult.