topic Re: arc changes it center while flexing (family creation) in Revit Structure Forum

arc changes it center while flexing (family creation)

abid.islamain — Tue, 21 Sep 2021 07:18:13 GMT

hello everybody,

I want to create an arc in one quadrant of the front view using extrusion with R1 and R2 as shown in image. it works when I change the radius but when I array it in one direction as shown in 3d image then changing the radius of arc extrusion displaces the center. the radius does changes but with different center.

I am attaching the family as well. I am using Revit 2020

Re: arc changes it center while flexing (family creation)

RDAOU — Tue, 21 Sep 2021 08:36:50 GMT

@abid.islamain

It is not clear what you are trying to model...Do you want the array to behave like an offset?

Re: arc changes it center while flexing (family creation)

abid.islamain — Tue, 21 Sep 2021 09:32:09 GMT

I want to create a solid arc with inner and outer radius and some depth

Then array it on certain length with spacing as parameter

Re: arc changes it center while flexing (family creation)

RDAOU — Tue, 21 Sep 2021 10:15:08 GMT

Image above is a capture of your original Post...

In Family Editor - Arrays, the Radius of each component instance cannot change if they are grouped and associated. It will always be the same Radius
When you array a circular element, the element gets copied/repeated every X distance and/or X number of time Subsequently displacing the center

=> the behavior you described is a normal behavior of an Array

See the image below of an Offset vs Array ...the former you cannot achieve using Array in family editor

Re: arc changes it center while flexing (family creation)

abid.islamain — Tue, 21 Sep 2021 11:24:05 GMT

@RDAOUyou arrayed the circular element on right side what i want is to array the same circular element on back side and keep the center same every time I change the radius of element

Re: arc changes it center while flexing (family creation)

RDAOU — Tue, 21 Sep 2021 11:32:46 GMT

@abid.islamain

Depends on how you array (ie: Append new instances to end or in the middle). Append new instances to end - Constrain its center of the first and second instances of the array to the vertical and horizontal ref planes

Re: arc changes it center while flexing (family creation)

abid.islamain — Tue, 21 Sep 2021 14:45:54 GMT

@RDAOU please check the video and thank you for your help

https://nustedupk0-my.sharepoint.com/:v:/g/personal/abiullah_pg19mce_student_nust_edu_pk/ETWNoTABVFZElDWTlywi1lcBlvn0q71mqFvKckenimna0Q?e=d6b5zh

Re: arc changes it center while flexing (family creation)

RDAOU — Tue, 21 Sep 2021 15:22:38 GMT

@abid.islamain

Do not array the extrusion directly in its family...

nest it into a host generic model or generic line based
Unche l work plane based ... the child family doesn't need that
Once nested, lock the vertical and horizontal planes to those in the host
Array the lock 2nd instance

Re: arc changes it center while flexing (family creation)

abid.islamain — Tue, 21 Sep 2021 15:46:11 GMT

thank you for your time it worked