Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Go Back   VAF Forums > Model Specific > RV-12/RV-12iS
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 11-07-2021, 11:01 AM
bsbarnes10 bsbarnes10 is offline
Join Date: Sep 2019
Location: Texas
Posts: 48
Default Non-dimpled nut plates on dimpled holes? Lower Firewall and Firewall Shelf

We've just gotten the forward section of the fuselage and on page 22iS/U-03 (rev. 1) in steps 2 and 8 you are directed to rivet K1000-3 nut plates to the Lower Firewall (F-01201C-1) and the Firewall Shelf (F-01201B-1). In both steps the parts that the nut plates are being riveted to are dimpled for flush rivets but the nut plates are not dimpled, nor are you instructed to dimple them. Is this correct? If installed this way there will be a small gap between the nut plate the corresponding part.

Up to this point in the fuselage, the majority of nut plates have been pre-dimpled for flush rivets. I do seem to recall at least one location where a non-dimpled nut plate was installed on a dimpled component but I think this was specifically noted in the plans.

I searched the forums and couldn't find anyone else asking this question so perhaps this is a normal practice (non dimpled nut plates on dimpled components) but it's new to me so I just want to confirm with the experts out there....

Dues Paid! Thanks for all the help...
Reply With Quote
Old 11-07-2021, 11:17 AM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,587

I dimple the nutplates. I think the mounting screws/bolts are more secure that way.

Some folks don’t.
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
Reply With Quote
Old 11-07-2021, 12:46 PM
GeoffP's Avatar
GeoffP GeoffP is offline
Join Date: Sep 2018
Location: NSW, Australia
Posts: 224

Like Ralph said, dimple them. You'll most likely need a ground down or reduced diameter female die though, and I suggest after dimpling that you carefully bend the tabs straight. They're much easier to rivet if they sit flush onto the surface and dimples.
RV-9, Empennage and Wings about done, Fuselage taking shape.
Reply With Quote
Old 11-07-2021, 04:20 PM
ralph skorupa ralph skorupa is offline
Join Date: Apr 2005
Location: WI
Posts: 27
Default Plate nuts

Many of us use “oops” rivets to fasten plate nuts . The head is so small you can machine countersink even in thinner material
Reply With Quote
Old 11-07-2021, 07:50 PM
fr0gpil0t fr0gpil0t is offline
Join Date: Apr 2013
Location: Colorado Springs
Posts: 74

I think it's an error in the manual and I stare at the results everyday as I'm now working on the engine ;-)

I didn't dimple the nut plate and it sits awkwardly on the back of that dimple. Now with more building experience I would have probably caught it but at the time I'm was thinking I assume there is a reason for not dimpling.

I would drill it out but it's those pesky stainless steel CCR rivets that love to spin in the hole. So I live with it.

Reply With Quote
Old 11-08-2021, 01:38 PM
bsbarnes10 bsbarnes10 is offline
Join Date: Sep 2019
Location: Texas
Posts: 48

Thanks guys, based on these responses we decided to dimple them and I think that was the right choice.

(I sure hope so, anyway, because you're right, drilling out those CR rivets is a pain in the butt!)

Dues Paid! Thanks for all the help...
Reply With Quote
Old 11-09-2021, 07:57 AM
HFS HFS is offline
Join Date: Aug 2009
Location: Lemoore, CA
Posts: 385
Default What I Did - "Dimple Shim"

These "shims" are available commercially, or so simple - just MYO.

Pretty self explanatory - a shim between the offending dimple and the nut plate.

Attached Thumbnails
Click image for larger version

Name:	Dimple Shim.jpg
Views:	29
Size:	165.0 KB
ID:	17997  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 07:22 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.