Is it possible to make a dimension equal to a driven dimension?
To make myself clear I am attaching an image. On that sketch, is it possible to give the horizontal distance between tangent point and sketch origin (indicated as a reference dimension of 53.9) as a driving dimension for the length of horizontal line (current auto dimension is 78)?
I tried measure (please see video clip) but it didn't work.
Solved! Go to Solution.
Edited because the reference expression didn't update accordingly.
For your 2nd question, check your object snap settings.
There is a caveat when using @TimF's method: even though there is an expression associated to the reference dimension, its value will NOT update while the dimension is marked as reference. The value of the expression is frozen and will not update until the dimension is made into a driving dimension. As an example, open @TimF's file and change the value of p1. The reference dimension will update to reflect the change, but note that the length of the line on the right side will not change until the reference dimension is changed back to driving.
This issue had been discussed earlier too.
Anyway as cowski1 explained, this is a shortfall in NX for parametric designing.
@TimF, I read your comment before you edited it. In NX 126.96.36.199, reference dimensions do not have expression numbers (pXX). If you give it as a driving dimension (which makes the sketch overconstrained) then you can use that expression number. But as cowski1 and you pointed out, it will not update.