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Spiral Challenge
chrisjh777
Member Posts: 207 ✭✭✭✭
I used kevin_o_toole_1 's spiral workaround here:
https://cad.onshape.com/documents/c526017c3b894f329b22c776/w/a189b5aba46e4e78a5fa6ecd/e/9474fe11c7f540f4a5752185
to create my Archemedean spiral in this design, but could not work out how to truncate the centre of the spiral sketch.
How do I edit the spiral sketch so it doesn't start at the centre? I need this to be a part (polypropylene pipe), not surfaces as shown here. The part could not be generated because the centre of the spiral results in self intersection.
I created this part some years ago using an equation driven curve in Solidworks, but would like to do the same in Onshape. The equation driven curve allowed numeric start and finish points, hence getting around the self intersecting issue I am seeing here.
Link to my design here: https://cad.onshape.com/documents/573310b3e4b0adc280b6ea15/w/9f9abe291a41c1703816f9e9/e/f03932ea02c1c06e61380b31
Thanks in anticipation.
https://cad.onshape.com/documents/c526017c3b894f329b22c776/w/a189b5aba46e4e78a5fa6ecd/e/9474fe11c7f540f4a5752185
to create my Archemedean spiral in this design, but could not work out how to truncate the centre of the spiral sketch.
How do I edit the spiral sketch so it doesn't start at the centre? I need this to be a part (polypropylene pipe), not surfaces as shown here. The part could not be generated because the centre of the spiral results in self intersection.
I created this part some years ago using an equation driven curve in Solidworks, but would like to do the same in Onshape. The equation driven curve allowed numeric start and finish points, hence getting around the self intersecting issue I am seeing here.
Link to my design here: https://cad.onshape.com/documents/573310b3e4b0adc280b6ea15/w/9f9abe291a41c1703816f9e9/e/f03932ea02c1c06e61380b31
Thanks in anticipation.
0
Best Answer
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erwin_1
Member Posts: 15 ✭✭
Best would be to use a truncated cone to map the helix on.
Otherwise starting from your spiral, draw a circle or so in the sketch through the spiral and use trim to delete the inner part of the spiral as I did here:
https://cad.onshape.com/documents/57333e82e4b0682bde64cf25/w/ec67de25700512adf7d900d6/e/c8924f5913ebb8bfde9d2c33
Erwin1
Answers
Otherwise starting from your spiral, draw a circle or so in the sketch through the spiral and use trim to delete the inner part of the spiral as I did here:
https://cad.onshape.com/documents/57333e82e4b0682bde64cf25/w/ec67de25700512adf7d900d6/e/c8924f5913ebb8bfde9d2c33
Erwin
I edited the initial sketch to create the truncated cone. In my opinion, this design approach is much easier to use than the equation driven curve sketch I used previously in Solidworks. Very easy to control the start and stop points of my spiraled tube with simple dimensions. (And my maths is not flash
Also thanks to Kevin O'Toole for the flat spiral sketch method, brilliant!!.
End result here: https://cad.onshape.com/documents/573310b3e4b0adc280b6ea15/w/9f9abe291a41c1703816f9e9/e/f03932ea02c1c06e61380b31