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Inaccurate Curve in Solidworks

Question asked by Fahd Motlak on Mar 2, 2013
Latest reply on Mar 4, 2013 by Ditmars Veinbachs

Dear Solidworks geeks,

 

I have drawn a curve in a 2D sketch with this function:

 

y(x)=50*sin(2*pi*x/550)

2.jpg

 

and i have drawn a line tangent to the curve at the point x=550 to get the slope the curve at this point, i found the angle of the slope is 29.73 deg.

 

While taking the derivative of this sine equation to get the slope at point x=550 gives the angle 32.72 deg, the first derivative equation is:

 

y'(x)=pi/5.5*cos(2pi)

3.jpg

 

Here is the sketch in solidworks:

Untitled.jpg

 

do any one knows what is the problem here, is solidwokrs accurate enough to find the slope angle? or Not!! ?

 

regards,

 

Fahd

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