[Ron B.]

On the ailerons for an RV-14 wing, Van's asks to dimple a part of the ribs 120 degrees. I'm pretty sure they are putting pop rivets (structural) of some sort (quitting time , did not look ahead yet) in these dimpled holes.
Other than ordering a set of 120 degree dies for a few holes anyone have another solution for forming these 120 degree holes? I'm seeing that the dimpling tool that uses finish nails and a pop rivet gun to set is also good for 120 degree Avex rivets. Wander why this type of dimpler is good for both 100 and 120 degree rivets?
Thanks Ron

 

[Flying Scotsman]

This is a very minor expense in the grand scheme of things, and in my experience, worth it. Invest in a set of 120 degree dimple dies for -4 rivets, and a 120 degree countersink with a #30 pilot, and use where appropriate. It really does make a difference in how the pop rivet sits on the skin or part being riveted, and all told it comes to < $100 in tools.

As we're fond of saying at my office...there's right, and then there's not right...might as well do it right.

 

[Ron B.]

Oh! it's not the expense, it's the waiting for the parts that's the hard part.
Thanks Ron

 

[M McGraw]

I like these questions and answers. I agree it is the waiting for the parts. Since Ron is so far ahead of me, I just add whatever part he needs to my list