help defining tube assembly

[Tenkan]

I have a tube assembly, a long tube with two smaller tubes welded on near one end perpendicular to the long tube. The long tube already is datum A due to some other features… The two tubes are spaced apart from each other and parallel to each other. I want to make certain the two smaller tubes are not angled too much from each other... What I cannot figure out how to define is how to call out the two tubes to be in line with each other?

(Nominally if you looked at the assembly straight on you would only see the first smaller tube)

lightweight, cheap, strong... pick 2

 

[pmarc]

Just apply position tolerances wrt A to two smaller tubes.

 

[Tenkan]

so simple, thank you pmarc

I kept thinking I had to make the smaller tubes positioned to each other because rotationally it doesn't matter how they end up on the longer tube.


lightweight, cheap, strong... pick 2

 

[thepete]

Wouldn't you want a projected position tolerance to the ends of the small tubes? That would keep the small tubes from skewing off at angles, even if they were positioned correctly at the weld.

Go easy on me, I'm still learning this stuff too.

-Pete

 

[Tenkan]

Wouldn't you want a projected position tolerance to the ends of the small tubes?

A simple position tolerance on a diameter applies to the entire length of the features axis.

lightweight, cheap, strong... pick 2