I have a simple beam part that i created, and I noticed a very weird thing happening when I use that C channel beam in an assembly.
In the first two images i try using measuring tool and I can see that these two surfaces are perpendicular.
But when I put that same part in the assembly and try mating something to it and all the mates went red.
So i discovered that some surfaces are not perpendicular to each other in the assembly even though they are in part view. refer pic 3 and 4
Does anyone know what could be causing this ?