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2D sketch to 3D guide curve

Question asked by Greg Hyman on Feb 16, 2015
Latest reply on Feb 16, 2015 by Greg Hyman

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Our customer has sent us a drawing, but is unable to send us a solid model.

The part requires a ball mill to cut a series of rounded slots in the face of a part.

The drawing shows the profile of the slot (the guide curve) as a 2-d sketch, and the length of the slot in radial degrees.

I fully understand the sketch, and I also understand the intent... but I am unable for the life of me to get SW to let me wrap the guide curve around the necessary diameter.

I am using a closed sketch, assuming I could simply Insert->Features->Wrap->Scribe and then grab the profile to drive my radius cut... but I am unable to complete the wrap operation, "Wrap failed, could not use any contour(s) from sketch.

Could any gurus please explain it to me in small words?

Jamil Snead Feb 16, 2015 12:56 PM

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This may not be the easiest or most elegant solution, but I think the end result is good. I drew the path as it is shown on the drawing, then I offset it to get the path of the center of the ball. Then I made a closed contour out of it, wrapped it onto a 90 mm dia surface, and converted wrapped path into a 3D sketch. Then I used that as a path for a sweep of a circle, and finally I used revolved cuts to finish off the ends.

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10281377.SLDPRT.zip102.9 KB

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Jamil Snead Feb 16, 2015 12:06 PM

I don't have SW2015 so I can't open your file, but I'll take a guess at the problem.

You can only wrap closed contours. So if you were trying to wrap a n open path, try sketching lines to make it a closed shape and then wrap/scribe. Then you can make a 3D sketch and just convert the lines that you want to use for the path.

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Greg Hyman Feb 16, 2015 12:19 PM

Hmmm... Maybe I'm not explaining it correctly...

John, it is 5 slots. I appreciate the example you sent, but the issue I am having is that the slots are *not* straight; they are wrapped around a 90mm diameter.

Jamil, I have made the desired contour closed. I am receiving an error which states, "Wrap failed, could not use any contour(s) from sketch."

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John Stoltzfus @ Greg Hyman on Feb 16, 2015 12:22 PM

The cut path is more like a helix - I didn't notice the png file you had attached -

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Glenn Schroeder @ Greg Hyman on Feb 16, 2015 12:30 PM

Would it work to create a solid body for the tool body, then use a Cut/Sweep feature? I attached a simplified version to illustrate what I mean.

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Cut-Sweep.SLDPRT.zip66.9 KB

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John Stoltzfus @ Glenn Schroeder on Feb 16, 2015 12:39 PM

Greg - Glenn,

I was also thinking about that approach......... but look at how the ends of the slot enters and exits the top of the washer, I don't have time right at the moment, this is what I would attempt next. draw the cut out part to the specs it shows then, draw the washer, but don't merge result, than remove the slot profile body.

Draw the side view extra wide and take a top down cut for the radius, you may have to mess with the length etc....

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Greg Hyman @ John Stoltzfus on Feb 16, 2015 12:42 PM

The issue I am having is that the guide curve is presented as a 2-D sketch, but my attempts to wrap it, and thus creating a 3-D guide curve, are failing.

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Greg Hyman Feb 16, 2015 12:36 PM

Glenn:

Thank you for the suggestion.

Yes, using a swept cut along the guide curve is my intent. However, the issue is that I am not able to generate the guide curve to match the drawing.

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Glenn Schroeder @ Greg Hyman on Feb 16, 2015 12:39 PM

I misunderstood the problem. Sorry about that.

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Jamil Snead Feb 16, 2015 12:56 PM

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Slot JS1.SLDPRT.zip108.9 KB

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Greg Hyman @ Jamil Snead on Feb 16, 2015 1:04 PM

Jamil: Brilliant! This is it exactly.

I'm going to have to spend some time looking through this to understand the part about "Then I made a closed contour out of it, wrapped it onto a 90 mm dia surface, and converted wrapped path into a 3D sketch." and see why my attempt at that failed! Thank you again!

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Jamil Snead Feb 16, 2015 12:06 PM
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I don't have SW2015 so I can't open your file, but I'll take a guess at the problem.

You can only wrap closed contours. So if you were trying to wrap a n open path, try sketching lines to make it a closed shape and then wrap/scribe. Then you can make a 3D sketch and just convert the lines that you want to use for the path.
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Greg Hyman Feb 16, 2015 12:19 PM
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Hmmm... Maybe I'm not explaining it correctly...

John, it is 5 slots. I appreciate the example you sent, but the issue I am having is that the slots are *not* straight; they are wrapped around a 90mm diameter.

Jamil, I have made the desired contour closed. I am receiving an error which states, "Wrap failed, could not use any contour(s) from sketch."
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- John Stoltzfus @ Greg Hyman on Feb 16, 2015 12:22 PM
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  The cut path is more like a helix - I didn't notice the png file you had attached -
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- Glenn Schroeder @ Greg Hyman on Feb 16, 2015 12:30 PM
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  Would it work to create a solid body for the tool body, then use a Cut/Sweep feature? I attached a simplified version to illustrate what I mean.
  Attachments
  - Cut-Sweep.SLDPRT.zip66.9 KB
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  - John Stoltzfus @ Glenn Schroeder on Feb 16, 2015 12:39 PM
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    Greg - Glenn,
    
    I was also thinking about that approach......... but look at how the ends of the slot enters and exits the top of the washer, I don't have time right at the moment, this is what I would attempt next. draw the cut out part to the specs it shows then, draw the washer, but don't merge result, than remove the slot profile body.
    
    Draw the side view extra wide and take a top down cut for the radius, you may have to mess with the length etc....
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    - Greg Hyman @ John Stoltzfus on Feb 16, 2015 12:42 PM
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      The issue I am having is that the guide curve is presented as a 2-D sketch, but my attempts to wrap it, and thus creating a 3-D guide curve, are failing.
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Greg Hyman Feb 16, 2015 12:36 PM
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Glenn:

Thank you for the suggestion.

Yes, using a swept cut along the guide curve is my intent. However, the issue is that I am not able to generate the guide curve to match the drawing.
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- Glenn Schroeder @ Greg Hyman on Feb 16, 2015 12:39 PM
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  I misunderstood the problem. Sorry about that.
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Jamil Snead Feb 16, 2015 12:56 PM
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This may not be the easiest or most elegant solution, but I think the end result is good. I drew the path as it is shown on the drawing, then I offset it to get the path of the center of the ball. Then I made a closed contour out of it, wrapped it onto a 90 mm dia surface, and converted wrapped path into a 3D sketch. Then I used that as a path for a sweep of a circle, and finally I used revolved cuts to finish off the ends.
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- Slot JS1.SLDPRT.zip108.9 KB
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- Greg Hyman @ Jamil Snead on Feb 16, 2015 1:04 PM
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  Jamil: Brilliant! This is it exactly.
  I'm going to have to spend some time looking through this to understand the part about "Then I made a closed contour out of it, wrapped it onto a 90 mm dia surface, and converted wrapped path into a 3D sketch." and see why my attempt at that failed! Thank you again!
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2D sketch to 3D guide curve

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