How can family type of my elbow automatically convert?

[Anonymous]

I have an elbow like photo below. It has 2 type "noi goc 90" and "noi goc 45". How it automatically convert into "noi goc 90" when angle fitting is 90 and it convert into "noi goc 45" when angle fitting is 45.

[zhengrong.fu]

Hello,  SONGNGANG 

I think you need to set Angle from Type Parameter to Instance Parameter as screenshot below. If it's a type parameter, the angle is always fixed. If it's an instance parameter, it can adopt to the angle between the two connecting pipes if you set the constraint correctly.

You can refer to the out-of-box content Libraries\US Imperial\Pipe\Fittings\Generic\Elbow - Generic.rfa

Thanks,

Zhengrong