REDUCING ELBOW

[narsimhamurthy21]

unable to draw reducing elbow in Revit I am tired of changing the welded generic family connection size but its changing at both the sides

I want one side of the elbow it should be 150 dia and another side I want 100 dia is there a welded fitting family that supports this change.

please let me know how to fix this in the elbow family

[iainsavage]

Sounds like you need a blend with two different diameter dimensions/parameters.

The standard elbow will probably only have one diameter parameter which is automatically read from the pipe diameter.

[iainsavage]

Swept blend

[aeidAEEEF]

Hi,

I think you have to assign one of the connectors as primary. see below.

Please mark as a solution if this helps.

[iainsavage]

Standard elbow families are usually just a sweep with only one pipe diameter/radius parameter driving the geometry.

A sweep can't have different diameters at opposite ends no matter which connector is designated as primary.

Swept blend with two different pipe diameter/radius parameters to flex each end separately would, in my opinion, be the solution.

[narsimhamurthy21]

Hi. Can you share the family which is working for you for this?

[aeidAEEEF]

sure. here's 

Please mark as a solution if this helps.

[iainsavage]

Here's what that looks like when you reduce one of the connection sizes.  

[iainsavage]

here's a link to a victaulic fitting which you could edit to suit your needs (probably just omit the collars).

It uses a swept blend.

https://www.bimobject.com/en-us/victaulic/product/victaulic-019

[aeidAEEEF]

you are probably not editing it the right way. if you have seen I've posted a picture of it when reduced and was not as your post shows.

[iainsavage]

I changed one of the connection diameter values. How else would you edit it?

Here it is in a project. Just doesn't look right. From the parameters it looks like its a Geberit press-fit bend that's been modified.

I strongly suggest that a swept blend would be the way to go or use an appropriate family as the starting point such as the victaulic one linked above (which uses a swept blend).