Can't combine 2 bodies that clearly overlap - Help!

[vincamCHHYK]

Please help. After a couple of hours' trying I still can't join 2 bodies. I understand the error message when there is insufficient overlap or edges are too coincident but I've tried to correct for this with a very deliberate overlap.

From the image attached you can see the main body in grey (a tube with a funky slit along it) and the tool body in blue (an edge for the length of the tube and was created by lofting a kind of triangle along the length of the tube). You can see the edge body clearly overlaps with the main body and along its entire length but 360 still won't let me join the two!

[laughingcreek]

not enough info to give help

[aliobidi]

Hi , 
can you share the file 

[jeff_strater · Accepted solution]

are there any area where the geometry is nearly coincident?  That is, the surfaces of each body are right on top of each other?  That is a common cause of a Combine failure, but as already mentioned, without the model itself, it's all just speculation

[GRSnyder · Accepted solution]

Hard to tell for sure without the actual model, but it looks like you still have a couple of tangency points with infinitely thin overlaps. That's certain to confuse Combine.

[vincamCHHYK]

It works!!! You and jeff.strater are spot on. Seems like the tool body has to be attached to the main body at the exact tangency points otherwise there is a tinniest thin surface of the tool overlapping the surface of the main body. You guys have incredible eyes - thank you.