
Re: equation driven 3d curves
Charles Culp Jul 23, 2010 10:24 AM (in response to Jeremy Feist)I tried and tried. I also could not get it to work.

Re: equation driven 3d curves
Jeremy Feist Jul 23, 2010 10:27 AM (in response to Charles Culp)well, I guess it is time to try the VAR.
Jeremy

Re: equation driven 3d curves
Jeremy Feist Jul 26, 2010 10:15 AM (in response to Jeremy Feist)I guess this is a "known issue"
"This issue has previously been reported to our development team in SPR 441040 (Unable to use custom properties in equation driven curve). I have attached the SPR to this service request, and you will be notified when this issue is resolved.
A possible workaround is to link to dimensions instead. As an example, I am attaching 'workaround.SLDPRT' with the curve equation linked to a dimension in the same sketch."

workaround[2].SLDPRT.zip 23.3 KB

Re: equation driven 3d curves
Peter Debono Apr 13, 2011 12:01 PM (in response to Jeremy Feist)Any ideas on how to handle negative numbers?

Re: equation driven 3d curves
Jerry Steiger Apr 13, 2011 4:01 PM (in response to Peter Debono)Peter,
One possible workaround would be to add a constant offset to all of your values to get them all positive, then move your curve the opposite direction when you're done. If you can't move a curve, then you could generate a surface from the curve, move the surface, and then generate a curve from the surface.
Jerry Steiger

Re: equation driven 3d curves
Peter Debono Apr 14, 2011 1:24 PM (in response to Jerry Steiger)Thanks for the reply Jerry, but that won't work. The equation I'd like to define has a series of constants that may be <=0; sketch geometry must be >=0.
My intention is to create a part template with the constants and curve predefined so that a user can quickly create a part based on the saved parameters and a quick edit of the variable values. Your suggestion can work only if the user changes the sign for each constant in the equation as required which would be fine if the equation was much smaller than it is.

Re: equation driven 3d curves
Jeremy Feist Apr 14, 2011 2:47 PM (in response to Peter Debono)assuming you can put limits on the range of the constants, it could work  though it will take twice as many properties.
example
constant = 5 to +5
constant2 = constant+6
dim1 = constant2
equation:
y=(dim16)*x

Re: equation driven 3d curves
Peter Debono Apr 14, 2011 2:51 PM (in response to Jeremy Feist)Clever!
Will give it a shot and let you know how it works.

Re: equation driven 3d curves
Peter Debono Apr 20, 2011 12:17 PM (in response to Jeremy Feist)Your oefficient offset method works, but unfortunately the coefficients in the equation to be solved are too small and the values are lost in the offset. Strange because the original coefficients are recognised even though they are less than 1e8.

Re: equation driven 3d curves
Jeremy Feist Apr 20, 2011 12:25 PM (in response to Peter Debono)you could try scaling and offsetting
constant2 = constant*100000000+6
y = (dim16)/100000000*x







