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# Modelling a spirally corrugated wall on a helical tube

## Modelling a spirally corrugated wall on a helical tube

### RE: Modelling a spirally corrugated wall on a helical tube

Dear Fsdani, try in this way:
1-create a curve with a polar coordinate system:
r = 80
theta =4 * t * 360
z = 200 * t
2-create a sweep with this curve (tube)
3-create another curve with a polar coordinate system:
r = 80 + 15 * cos ( 40 * t * 360)
theta =4 * t * 360
z = (200 * t) + 15 * sin (40 * t * 360)
4-create a sweep with this curve (channel around the tube)
5-Now you can merge the surfaces

### RE: Modelling a spirally corrugated wall on a helical tube

UPDATE
you can create some parameters to control this part:
D: diameter of the spiral
DT: diameter of the tube
DC: diameter of the circular section around the tube
NS: numbers of spirals
NC: number of corrugations around the tube
HS: height of the spiral
First curve:
r = (D/2)
theta = NS * t * 360
z = HS * t
second curve:
r = (D/2) + (DT/2) * cos ( NC * t * 360)
theta = NS * t * 360
z = (HS * t) + (DT/2) * sin (NC * t * 360)

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