Dimple or Coutersink?

Womack2005 · Post by **Womack2005** » Mon May 28, 2007 6:22 pm

How did you guys handle the rear spar holes? Dimple or Countersink?

Specifically, the bottom holes that also have a rib attach flange hole. These are basically impossible to dimple now that the ribs are riveted to the rear spar.

[img]
http://www.rivetbangers.com/g2data/foru ... ar_rib.JPG[/img]

Womack2005 · Post by **Womack2005** » Mon May 28, 2007 6:25 pm

captain_john · Post by **captain_john** » Mon May 28, 2007 9:20 pm

Will, you can dimple two layers at once. You really need to crank on them, but the end product is good.

That is DEFINATELY an oversight in the instructions. There is no mention of this until after you need to do it. There should be something about this BEFORE you rivet the wing ribs onto the spar.

...or you could do them afterwards like I did.

CJ

JohnR · Post by **JohnR** » Mon May 28, 2007 9:40 pm

I dimpled both layers at once using the pneumatic sqeezer. Seemed to work fine.

painless · Post by **painless** » Mon May 28, 2007 9:46 pm

Will:

Seems to me that you could CS this area quite easily. The rib flange would keep your CS bit from wandering very well.

As CJ suggested, dimpling is possible, but if you do, I would spin your deburring tool in the hole a couple revs to flatten out the walls of the dimple a bit, as they would not be as well defined as with a single layer of material. May result in the head of your rivets sitting up a bit proud.

BTW....Gotta get down there to visit some weekend if I can sneak away.

Wicked Stick · Post by **Wicked Stick** » Tue May 29, 2007 6:29 am

I dimpled mine, then ran the debur tool on it exactly as others have suggested.

Brantel · Post by **Brantel** » Tue May 29, 2007 7:11 am

You can do two layers like others have said. Works fine. For the rear spar, give it a crank or two with the deburing tool anyway due to the thickness of the spar it does not get as crisp of a dimple.

Womack2005 · Post by **Womack2005** » Tue May 29, 2007 7:16 am

Thanks guys! I'll let ya know how it turns out

Jeff, how many hours do you have now since phase 1 ended?

jim_geo · Post by **jim_geo** » Tue May 29, 2007 12:48 pm

Any time you can dimple, do that. More metal=more metal.

painless · Post by **painless** » Tue May 29, 2007 6:26 pm

Will:

N782P has 57 hrs on it. So far no problems. Just have to figure out why my Anywheremap WX is not downloading data

Womack2005 · Post by **Womack2005** » Fri Jun 01, 2007 7:16 pm

So I just dimpled the rear spar and rib flange together with the Pneumatic SqueezOmatic. Great results

JohnR · Post by **JohnR** » Fri Jun 01, 2007 10:27 pm

See, we told you it would work.