# Is their any way to do this?....

• posted
I've successfully created a tube that passes through a series of holes,
thanks to you guys. Now I would like to know if their is any way to put an
arc length constraint to the 3d sketch? I can manage to put a distance
constraint from the origin to the last point in the 3d sketch, but that just
allows me to parametrically change the length of the shortest distance
between the 2 points. I would like be able to parametrically change the arc
length of the resulting line created from the 3dsketch points. Is their any
way of doing thins in sw 2003?
• posted
It would be easier for people to understand your question and give you a good answer if you could get your terminology straight. You talk about an "arc length of a line created from 3D sketch points". It doesn't make any sense. I'm guessing you have a 3D spline. You can measure the length of a spline, but you can't constrain the length in SW2003.
matt
"joe" wrote in news:4047f16d snipped-for-privacy@newsfeed.slurp.net:
• posted
Yes, the 3d sketch command creates a 3d spline out of work points, and when I select the resulting 3d spline with the measure tool it calls the value "arc length", so that's what I used as a description for what I was looking for in my last post. Can sw 2004 constrain "arc length" from a 3d spline?
• posted
"joe" wrote in news:40481060 snipped-for-privacy@newsfeed.slurp.net:
No, SW2004 cannot constrain the length of a spline.
You could constrain the lengths of a bunch of individual lines and make a fit spline, but it doesn't sound like that's what you're after.
• posted
Ok, thanks
• posted
I was thinking about an add-in or macro that would do this. The problem is how (even in 2D) as a spline generally has a buch of degrees of freedom on which you can act (position each control point, alter tangents, even add control points...) In other words, there is no single solution to your problem, so you must define more clearly how you want the spline to be "constrained". In the meantime, you might use our free Spliner addin which shows the length of any curve you select while you edit it.