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As far as I know, there isn't anything that will allow you to do that. One thing that might work is changing the line to vertical and then changing the dimension to be driven
I'm not sure if that will work for what you're trying to do but it's worth a try?
Well, I've been in your place many times.
That being said, if a line is dimensioned at a value, and can be equal to zero, in theory to keep proper design intent, that means it is being dimensioned to the wrong thing. In theory you should be dimensioning to a different line to begin with. (*covers ears and cowers in the corner*).
Yeah, from what I've read about SW2009, the are going to allow negative dimensions (and hopefully 0 as well); so at least we can look forward to that in the future.
would it hurt do dimention it to 0.00000394in which is the smallest number you can use to dimension with.(in 2k7 atleast) i wouldn't think such a small number would hurt your design unless you are dimensioning in microns or something.
Planes can be offset to a zero dimension.So if you create a plane & then constrain the line to it, you will be able to achieve the zero ... and also will be able to flip the direction, effectively allowing a 'negative' dimension.