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  #1  
Old 01-18-2021, 04:46 PM
tdavis1198 tdavis1198 is offline
 
Join Date: Jul 2019
Location: Toronto, Ontario
Posts: 32
Default Nutplate Issue - Screw does not fit

I am trying to insert the screws that secure the pitch trim servo assembly onto the elevator. I can't get one of the screws to bind with the threads in one of the K1100-06 nut plates. I assume that there is a bit of distortion.

I assume that I will have to tap the nutplate. Is this correct and any suggestions what size and type tap I need to get?
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  #2  
Old 01-18-2021, 05:27 PM
abwaldal@gmail.com abwaldal@gmail.com is offline
 
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 144
Default time to spend money

Time to buy a tap/die set. But if it's not structural I will usually take half the pinch out of the nut so I don't snap the screw off. Been there done that.
Oh as for the call out on the tap. All the numbers are worn off both of my tapes for those.
Art
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  #3  
Old 01-18-2021, 05:42 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,209
Default 6-32

Most common used on the airplane.
4-40, 6-32, 8-32, 10-32, 1/4-28, 3/8-16
Don't buy Harbor Fright. Buy quality taps.
Nothing worse than snapping off a hardened tap in a hole.
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Estes Park, CO
http://wirejockrv7a.blogspot.com
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Donated 01/01/2021, 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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  #4  
Old 01-18-2021, 10:58 PM
DaveWelch DaveWelch is offline
 
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 447
Default Pre-exercise them

After a similar experience with an installed nutplate that was a pain to replace, I vowed to run a boelubed screw thru every nutplate before riveting them in place. Preemptively Found a few more that would have given me problems.
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RV12 N951DZ
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  #5  
Old 01-19-2021, 05:53 AM
CJK CJK is offline
 
Join Date: Mar 2009
Location: Middle TN
Posts: 82
Question

Quote:
Originally Posted by DaveWelch View Post
After a similar experience with an installed nutplate that was a pain to replace, I vowed to run a boelubed screw thru every nutplate before riveting them in place. Preemptively Found a few more that would have given me problems.
New builder here: I've seen a few folks recommend this, and it sounds wise. Is there a particular version of Boelube (paste, gel) that you recommend? Do you just leave it on the threads once you've checked them, or do you wipe it off before installing the fastener for the final assembly?
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Chris Klugewicz
fly from KJWN, live near KSRB

RV-14 build imminent
∙ N415EJ reserved
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  #6  
Old 01-19-2021, 08:35 AM
sf3543 sf3543 is offline
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,065
Default

You'd be surprised how many times I have found the wrong size nut plate installed or where the threaded part got squeezed by the riveter.
If it is the incorrect size then drill it out and replace with the correct size.
If its the correct size for the screw, then what the others said.
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  #7  
Old 01-19-2021, 09:41 AM
stigaro stigaro is offline
 
Join Date: Aug 2020
Location: Ontario, Canada
Posts: 25
Default

You may have the same issue a few of us have seen lately. No threads in the nutplate?

https://vansairforce.net/community/s...ighlight=wrong
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  #8  
Old 01-19-2021, 11:21 AM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Boelube

Quote:
Originally Posted by CJK View Post
New builder here: I've seen a few folks recommend this, and it sounds wise. Is there a particular version of Boelube (paste, gel) that you recommend? Do you just leave it on the threads once you've checked them, or do you wipe it off before installing the fastener for the final assembly?
I prefer the paste blue stuff. Leave it. Unless you're really OCD like me.
Dime. Soak them after in a solvent. Dry. Spray with primer. I use NAPA 7220. I have a section of 1x2 with nails. Heads are cut off. I spray 40 at a time.
Totally unecessary but I do it anyway.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, 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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