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07-03-2020, 09:53 PM
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Join Date: May 2020
Location: West Linn, OR
Posts: 75
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Nutplates and screws
Am I doing something wrong? I feel like the screws into the nutplates requires much more torque than it should, and they aren't crossthreading. I'm using the K1100-06 nutplates on the elevator and they will go in, but it takes a lot of effort and I'm worried I am going to strip the Phillips heads on the screws.
I'd appreciate any advice
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07-03-2020, 10:08 PM
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Join Date: Jan 2005
Posts: 959
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Try some Boelube paste on the screws. It helps. Some folks use beeswax, toilet wax ring, etc. Some lighty run a tap through, but that may ruin the locking feature.
Last edited by RV8JD : 07-03-2020 at 10:11 PM.
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07-03-2020, 10:14 PM
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Join Date: Jun 2011
Location: Mansfield Australia
Posts: 19
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Nut plates and screws
When I install nut plates, I usually hold the nut plate With an older used cad plated screw. This usually helps with subsequent new screws where you don’t need so much torque. I find you will need to do this for sure if you use stainless steel screws as they seem to be a fraction larger in diameter.
Last edited by bardample : 07-03-2020 at 10:17 PM.
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07-04-2020, 01:21 AM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
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Nutplates have a locking thread, you can chuck a tap in a drill, dip in oil, and clean them out, or keep the locking feature, but definitely oil whatever screws you use, especially stainless steel screws.. and throw out your Phillips screwdrivers (or give them to somebody you don?t like) and replace them with JIS screwdrivers. The JIS fit Phillips heads so much better, I?m kinda mad that it took me 40 years to learn about them?
__________________
Tom
Las Vegas
RV-8 empenage almost finished
Horizontal Stab done! 2-15-2020
Vertical Stab Done! 5-27-2020
Rudder Done! 5-31-2020
Wings ordered!...
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07-04-2020, 06:19 AM
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Join Date: Sep 2019
Location: Ionia Michigan
Posts: 160
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I never heard about JIS screwdrivers, I'm going to order some today.
__________________
RV6 N7219d
IO-320-B1A
Sam James cowl
first flight May 2, 1997
RV8 #83830 tail done, wing done
Fuselage started
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07-04-2020, 07:55 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Nutplates
I have a jig. It clamps into the vise. Every nutplate gets checked. Screw and boelube. When the sacrificial screw gets worn, toss it. If the nutplate seems overly snug, I run a tap in a couple turns. The clamping feature is just a squeezed end. If you look, it's out of round. They don't get them all exactly the same.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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07-04-2020, 08:01 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by Taltruda
Nutplates have a locking thread, you can chuck a tap in a drill, dip in oil, and clean them out, or keep the locking feature....
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This comes up pretty frequently here, especially when new builders have their first experiences with nutplates, and statements like this Need to be made very carefully. Building an airplane is not like working on your house, or car, or boat, or bicycle - fasteners have locking features in aviation because it is very critical to not have fasteners come loose!
Yes, there absolutely are places in your RV build where running a tap through a nutplate to remove the locking feature is fine - interior trim and floor panels, for example. But when a ?newbie? reads someone?s statement to ?just run a. Tap through it?, they might do so on a critical part - like an elevator hinge retainer - and that would not be a good idea. It?s also not a great idea to have fairings come loose, so blanket statements can be dangerous.
Waxing and oiling screws, using good screwdrivers, and taking your time to do it right are the real answers to this problem.
Paul
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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07-04-2020, 08:48 AM
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Join Date: Jan 2006
Location: Vonore, TN
Posts: 369
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Darwin had a neat idea for "seasoning" nutplates on page 12 of the linked document for installing wingtips. On occasion I've received unthreaded nutplates or nutplates with too-tight a locking feature.
http://www.vansairforce.net/articles...pmounting2.pdf
By the way, it is available in the Articles section of VAF.
__________________
John Tierney
Vonore, TN
RV-7A - N777JT Flying
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07-04-2020, 11:03 AM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
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Quote:
Originally Posted by Ironflight
This comes up pretty frequently here, especially when new builders have their first experiences with nutplates, and statements like this Need to be made very carefully. Building an airplane is not like working on your house, or car, or boat, or bicycle - fasteners have locking features in aviation because it is very critical to not have fasteners come loose!
Yes, there absolutely are places in your RV build where running a tap through a nutplate to remove the locking feature is fine - interior trim and floor panels, for example. But when a ?newbie? reads someone?s statement to ?just run a. Tap through it?, they might do so on a critical part - like an elevator hinge retainer - and that would not be a good idea. It?s also not a great idea to have fairings come loose, so blanket statements can be dangerous.
Waxing and oiling screws, using good screwdrivers, and taking your time to do it right are the real answers to this problem.
Paul
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Point taken Paul, I was just explaining his options, and that the tightness is a feature built in, not a defect. Sometimes I like to ?soften? the locking feature, but you are right that I should be more careful with a blanket statement that someone could apply to all nutplates.
__________________
Tom
Las Vegas
RV-8 empenage almost finished
Horizontal Stab done! 2-15-2020
Vertical Stab Done! 5-27-2020
Rudder Done! 5-31-2020
Wings ordered!...
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07-04-2020, 12:04 PM
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Join Date: May 2020
Location: West Linn, OR
Posts: 75
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Thanks
Thanks for the input. I don't remember reading anything about the locking feature of the nutplates. I ordered some Boelube and now that I know that they are supposed to be reasonably tight, I don't have to worry that I'm using the wrong parts together.
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