Sine wave to 3D Model

[Adhip]

Hello all

I'm trying to create a model using sine wave. My initial thought process is to calculate number of points using the sine wave. Push those points on 2D workplane and then connect them using spline. Close the figure and extrude it as desired.

I wanted to know if there is any better way to do the same? 

Thanks in advance!!

[Dov Grobgeld]

If you compromise and make the perpendicular axis a cosine wave, it get's much easier. ;-)

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[Adhip]

What do you mean by converting axis into cosine wave? 

[tran chan]

HI Adhip,

I think u no need to create sine function or model

https://github.com/medicationforall/cadqueryhelper

Just need to download in link & load those function.

Virus-free.www.avg.com

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[Adam Urbanczyk]

Use parametricCurve, like so https://cadquery.readthedocs.io/en/latest/examples.html#cycloidal-gear

[Yoululauren]

I would use spline for this purpose. It is easier for me to understand. parametricCurve does similar things like spline internally. 

Let's say:

width = math.pi * 2.0

steps = 20

inc = width / steps

pts3 = [(x * width / steps, math.sin(x * width / steps)) for x in range(steps + 1)]

or, if you have nump installed

pts3 = [(x, math.sin(x)) for x in numpy.arange(0, width + inc, inc)]

then,

r3 = (cq.Workplane().spline(pts3))

Using parametricCurve() would be

r2 = (cq.Workplane()

     .parametricCurve(lambda t: (t, math.sin(t), 0.0), steps, 0.0, width, makeWire = False)

     )

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Given 10 programmers the same spec, they could give you 20 solutions, each and every one of them will work.

I love programming.

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[Adhip]

Thanks a lot. I will definitely try this. I'm still learning programming so it helps a lot.