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Re: Datum Curve by Equation and Parameters

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First, t is a counting engine which generate values from 0 to 1. This is 
what the help says about t:
A curve equation is defined in terms of the parameter " t ".
•" t " varies from 0 to 1.
• The variables (x, y z) or (r, theta, z) or (rho, theta, phi) should be 
defined in terms of the " t " parameter.
• As the " t " parameter continuously varies from 0 to 1, output values 
obtained from x, y and z variables are plotted to create the output curve 
shape.

The relations editor which opens for curve from equation creation also gives 
some examples, the heart of which is picking the right coordinate system, 
Cartesian, Cylindrical or Spherical with the appropriate units. The 
following is an example of a sine wave equation based on a Cartesian CS:
X = T*P (Where P is the Period); Y=A*SIN*(360*T) (Where A is the Amplitude).

*Also see the Relations Chapter in the Fundamentals Guide for a listing of 
all mathematical functions. And you need to set up values for P and A 
earlier in the relations section before stating the equation.

As far as SV and EV are concerned, this is probably in the context of the 
equation. So, in the above example for the value of Y where t*360 is a full 
circle of the sine wave, it starts by default at 0 and ends at 0. If you 
wrote it t*270, it would start at 0 and end at 270. So, specifying end 
values might be a way of getting it to start at 90 and end at 360 or 540 or 
any other non-default start and end points. A little Algebra should get you 
the answers to the rest of your questions.

D. JANES

"PLQ"  wrote in message 
news:1b96245b-bbac-45d1-8b5b-b17950ca9322@x6g2000pbh.googlegroups.com...

Geetings:

I'm new to Creo, but used Pro/E back in Ver. 20 and some WF releases.

I have a defined model PARameter and would like to use it as an end
value for the variable 't' when creating a Datum Curve by Equation.

Before I would set the range with 0<=t<=PAR, which worked.

In Creo there are start (SV) and end (EV) values defined, but how can
I ensure the endvalue will always equal my model PAR?

There aren't dimensions associated with the SV and EV, so how would I
need to set up the relation?

I can find the Feature ID and the desired Feature Parameter ID , but I
don't know how to relate this to the Model Parameter.

What is the syntax for a Relation to set the value of a Parameter of a
Feature to a Model Parameter?



Any help appreciated,

PLQ 

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Datum Curve by Equation and Parameters PLQ <1970.plq.0812@gmail.com> - 2012-05-14 19:30 -0700
  Re: Datum Curve by Equation and Parameters "JANES" <djanes@cox.net> - 2012-05-20 14:45 -0700

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