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  #1  
Old 07-03-2020, 09:53 PM
msmst25 msmst25 is offline
 
Join Date: May 2020
Location: West Linn, OR
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Default 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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  #2  
Old 07-03-2020, 10:08 PM
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RV8JD RV8JD is offline
 
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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.
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Last edited by RV8JD : 07-03-2020 at 10:11 PM.
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  #3  
Old 07-03-2020, 10:14 PM
bardample bardample is offline
 
Join Date: Jun 2011
Location: Mansfield Australia
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Default 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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  #4  
Old 07-04-2020, 01:21 AM
Taltruda Taltruda is offline
 
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Location: Las Vegas, NV
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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?
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  #5  
Old 07-04-2020, 06:19 AM
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D Weisgerber D Weisgerber is offline
 
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I never heard about JIS screwdrivers, I'm going to order some today.
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  #6  
Old 07-04-2020, 07:55 AM
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wirejock wirejock is offline
 
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Default 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.
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  #7  
Old 07-04-2020, 08:01 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Taltruda View Post
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....
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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  #8  
Old 07-04-2020, 08:48 AM
John Tierney John Tierney is offline
 
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Location: Vonore, TN
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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.
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  #9  
Old 07-04-2020, 11:03 AM
Taltruda Taltruda is offline
 
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Location: Las Vegas, NV
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Quote:
Originally Posted by Ironflight View Post
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
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.
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  #10  
Old 07-04-2020, 12:04 PM
msmst25 msmst25 is offline
 
Join Date: May 2020
Location: West Linn, OR
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Default 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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