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# How to make a dimension equal to a driven dimension

Creator

Hi everybody,

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.

(view in My Videos)

Thanks,

Ural

9 REPLIES

# Re: How to make a dimension equal to a driven dimension

Phenom

Create a reference line and make it equal length

# Re: How to make a dimension equal to a driven dimension

Solution Partner Phenom
Like Agrivas is telling make a reference line, use horizontal point align to make site that the horizontal line is constrained.

Ruud van den Brand
cards PLM Solutions

# Re: How to make a dimension equal to a driven dimension

Creator

Thank you Ruud and @agrivas for your answers. That solved my problem.

Do you know why I cannot snap to any point other than the origin when using measure for a driving dimension?

# Re: How to make a dimension equal to a driven dimension

Phenom

Edited because the reference expression didn't update accordingly.

-Tim

# Re: How to make a dimension equal to a driven dimension

Solution Partner Phenom
Ural,

can you make a screenshot of your NX window.
Maybe there is a selection that's not on.

Ruud van den Brand
cards PLM Solutions

# Re: How to make a dimension equal to a driven dimension

Gears Esteemed Contributor

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.

# Re: How to make a dimension equal to a driven dimension

Phenom

This issue had been discussed earlier too.

Anyway as cowski1 explained, this is a shortfall in NX for parametric designing.

Michael Fernando

Die Designer
NX 11.0.2.7 + PDW

# Re: How to make a dimension equal to a driven dimension

Creator

@TimF, I read your comment before you edited it. In NX 11.0.2.7, 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.

So, as @agrivas and @ruud_vandenbrand said, I guess the best solution is creating a reference line and using a constraint.

# Re: How to make a dimension equal to a driven dimension

Creator
Ruud, I stared a new discussion on this topic:
https://community.plm.automation.siemens.com/t5/NX-Design-Forum/Point-Snaps-Tangency-Point-and-Measu...

I attached two clips about the issue. It would be great if you can have a look at them.

Ural