9 Replies Latest reply on May 9, 2016 6:53 AM by Steve Calvert

# Getting the center line of a pipe?

Hello everyone,

I´m trying get the center pipe from an imported file, so I haven't the original file and SW can't recognize the operations. The pipe has curves on the 3 axis and in those curves I can't get the real radius... Do you have some ideas?

In the picture I'm drawing the path with 3D sketch, but curves are imposible to determine. Thanks for your responses.

• ###### Re: Getting the center line of a pipe?

How did you extrude the elbows?  If you used the Sweep Extrude feature then all you need to do is show the profile sweep sketch and then dimension those lines..

• ###### Re: Getting the center line of a pipe?

What about using a 3-point arc to replace the straight line that connect the end points of 2 of the straight pipe center lines? Then use a tangent relationship to fully define the curve. You can then get the dimension of the arc. (A tangent spline is another option.)

• ###### Re: Getting the center line of a pipe?

You can do that as well, but if the paths are already there, you just need to insert a sketch and convert the sketch entities and draw additional straight lines like Steve Calvert mentions below...

• ###### Re: Getting the center line of a pipe?

John, I didn't extrude the elbows, someone gave me the files in step, so I've to do the inverse engineering, find the path

• ###### Re: Getting the center line of a pipe?

Then you chose the right answer

• ###### Re: Getting the center line of a pipe?

So, start a 3D sketch and draw lines that represent the straight sections.  Then select two of those lines and then add a point to the intersections.

You should be able to at least find points this way.

Steve C

• ###### Re: Getting the center line of a pipe?

Hi Steve,

Extending the lines as in your drawing is a good option, then I can construct an auxiliary plane and make a circle with 2 tangent points and the radius. It takes some time for get many curves but the curve is identical. Then with the curves you have to select all straight and curve lines and make a new 3D sketch to get the final path.

Thanks for all your responses. The second image is the reason why I wanted to get the path.

• ###### Re: Getting the center line of a pipe?

Yes, I see now what you're doing.  Normally, when someone asks this kind of question it is for getting XYZ coordinates for a tube bending machine.

Steve C

• ###### Re: Getting the center line of a pipe?

Insert a 3D Sketch. Use the tangent Arc to input the line in the bent areas.