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Re: Sine wave along a spline path
Robert Stupplebeen Dec 2, 2009 8:42 AM (in response to 1LC4F90)Check out equation driven curve. You will need to figure out an equation for your path. Once you have that add the sine wave to the equation. See attached.
Base: X^32*X^2+1
With Sine: X^32*X^2+1+sin(10*x)/5
[01]
I hope this helps.
Rob Stupplebeen

Sine.SLDPRT.zip 22.8 KB

Sine.GIF 7.5 KB


Re: Sine wave along a spline path
Charles Culp Dec 2, 2009 9:22 AM (in response to 1LC4F90)This is fairly easy once you know the technique!
I have attached an example.
The accuracy of this method is described here (it is accurate enough for typical engineering/manufacturing work, don't worry about it unless you need it for analysis). https://forum.solidworks.com/message/65343#65343

SineWaveAlongSpline.SLDPRT.zip 66.5 KB

Re: Sine wave along a spline path
Josh Brady Dec 2, 2009 9:30 AM (in response to Charles Culp)I agree with Charles.... with one caveat. The limit for "twist along path" is 100 turns (SW09 at least). If you need 231 "waves" you will need to "segment" your spline somehow and do three sweeps.


Re: Sine wave along a spline path
Kelvin Lamport Dec 2, 2009 9:53 AM (in response to 1LC4F90)If this is what you are after, you will have to create the 235 arcs manually using the Tangent Arc tool... and the result is a little flakey if you tweak the spline path too much.

Sine On Spline.SLDPRT.zip 39.4 KB

Re: Sine wave along a spline path
Josh Brady Dec 2, 2009 10:03 AM (in response to Kelvin Lamport)I guess some clarification is needed. Do you want this to be close to a real sine curve? Because arcs and straight lines aren't particularly close to a true sine curve.
Re: Sine wave along a spline path
1LC4F90 Dec 2, 2009 11:10 AM (in response to Josh Brady)Hi, Thanks for al the ideas, I am after a sine curve as close as possible to a real sine curve. I was thinking of creating a centreline as a construction line and then adding a series of circles along that line at specified increments and then having tangential lines and trimming the excess away. This would mean that if the spline curve was 'opened' out and flattened the sine curve would become a real sine curve. (if that makes sense?)
Re: Sine wave along a spline path
Josh Brady Dec 2, 2009 11:30 AM (in response to 1LC4F90)Sorry, but it doesn't. Arcs and lines cannot really even come close to an accurate sine curve. If you want a close approximation, you must use Charles's method.


