[EJWash]

Hi All,

Working on my RV-14 tailcone. Regarding part F-01479 (.040 thick) Aft Bottom Skin. This part is rounded along the rivet lines. Flush-head rivets (AN426AD3-X) are used on this part.

My question is this: When dimpling, wouldn't the process flatten the skin in the dimpled area? Wouldn't this cause flat areas beyond the diameter of the rivet head?

 

[PaulvS]

I didn't have any problems with dimpling the tail cone on my -6A that is also .040. The metal is slightly springy so that probably helps, but if it bothers you then it is structurally acceptable to machine countersink .040 for 3/32 rivets.

 

[jaradtke]

use this on the concave side if you’re worried about local flattening.
https://www.cleavelandtool.com/coll...die-set-for-3_32-rivet?variant=31450439057470

 

[EJWash]

use this on the concave side if you’re worried about local flattening.

Thanks Jaradtke,

I have that die. Gonna give it a go.

 

[RV7A Flyer]

We just sacrificed a die and ground down the sides so it wouldn't damage the skin.