AutoCAD - Concentric arcs with variable width and curve heights

[jogibson6PA7C]

In this dwg I have a lot of different arcs with radii that all have a consistent offset with each other (total offset is 3.875).  What I'm trying to do is set it up so that I can change the width (47.875) and/or exterior curve height (5.25) of all the arcs at the same time, without decoupling the center point of each arc, or causing the offset between each arc to change.  

I've tried to use dynamic blocks, but I can't figure out how to make that work without the radii getting messed up, and I can't figure out how to set parametrics up to make it work either.  Any help or pointing in the right direction would be appreciated.  

[ The subject line of this post has been edited to include the product name by @handjonathan ]

[Ray-Sync]

Hola amigo

No sé mucho inglés, pero creo que tu solución es usar el comando PARAMETRIC de autocad (Específicamente la función "fix"). Hay muchos videos en Youtube para que puedas saber como emplearlo.

 

[handjonathan]

Hi @jogibson6PA7C 

Thanks a lot for posting your question to the forums!   Has the solution suggested by @Ray-Sync  helped with your issue?

  

Looking forward to hearing back from you with more information so we as a community can help you!  

[leeminardi · Accepted solution]

Here's an example of using parametric constraints. Change either d1 (48.865) or d4 (5.25) and the geometry should update as I think you want.  Note that I have added a fixed reference point to aid in maintaining symmetry.

[jogibson6PA7C]

This is the basis of what I've been trying to figure out.  The sticking point that I'm running in to is making it so that changing the parametric variables for that one arc will automatically change the layout of all the other arcs in the set.

When I do have parametric constraints set up for a single arc, my next step then is to add in linear parametrics to lock the shape of the arcs together, but i always get a bunch of really strange results from that.  I've tried aligned as well, but the issue there is it distorts the geometry where the arcs meets the straight lines.

[leeminardi]

It's not clear what you want to fix.  Give an example of changing a specific parametric dimension (d??) to a new value and then what happens and how that differs from what you want to happen.

[jogibson6PA7C]

Edit:  Through whatever object of serendipity I'm experiencing right now,  adding the concentric restraint to the setup I have in 1.02 actually worked this time.  Usually, when I add the concentric restraint, it makes everything break even worse. Pairing that with your original 1.01 then allows me to do *exactly* what I've been trying to do which means your 1.01 setup was the missing piece.

[leeminardi]

@jogibson6PA7C   I'm glad to hear your got it working to your liking and that I was of some help.  The behavior of parametric constraints are sometimes difficult to predict.