10-13 reduced diameter on J-CHANNEL

Page 10-13, step 2. Use a reduced diameter female die on the J-Channel of the bottom skin.

The holes along the skin edge that are about 1/2 inch away from the J-Channel on the skin itself, or the stiffeners that connect to it? It seems like the wording wants the skin edge holes but I don't see why to use a reduced diameter. There is lots of room. What am i missing?

Your die may be fine, I didn't have to use a reduced diameter every time they called it out, however, they are calling it out so you don't damage the part as there may be a slight curve from the forming process.

Edit: Kind of like fluting if you deform that curve accidentally with a die it could twist the skin.

So it's talking about the holes on the actual skin? They just seemed too far away to be "on the J-Channel". Maybe I'm overthinking it.

So it's talking about the holes on the actual skin? They just seemed too far away to be "on the J-Channel".

Click to expand...

The F-01478 skin has a J-Channel formed along the edges., not the holes that F-01486C attaches to. They don't want you introducing any twist by the die deforming the curve from the skin to the channel.

Ah, so it's stay small to stay far away, not stay small to fit. Thanks Bkervaski