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12-09-2015, 01:49 PM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,405
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Drilling AN bolt
I received an AN7-21A bolt rather than the AN7-21 called for. Any issues drilling into the threads of an AN7 bolt for a castle nut cotter pin?
Thanks
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Thanks Ron
RV-10 SOLD
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12-09-2015, 03:00 PM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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One idea for accomplishing your goal:
http://www.mtfca.com/discus/messages...tml?1351279141
Because you will be drilling the hole and cleaning up the threads after the cadmium plating operation, the areas where you remove the yellow cad plating will corrode much faster than a standard AN7-21 bolt. Whether or not this matters is a choice only you can make.
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Kurt W.
RV9A
FLYING!!!
Last edited by krw5927 : 12-09-2015 at 03:04 PM.
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12-09-2015, 03:02 PM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Good way to break a drill bit - been there done that. 
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The RV-8...Sold #83261
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12-09-2015, 05:57 PM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,405
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I drilled it and cleaned up the threads. It's at a very visible location and easy to keep an eye on.
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Thanks Ron
RV-10 SOLD
RV-14 Flying
AirCam flying
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12-09-2015, 06:14 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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Quote:
Originally Posted by krw5927
One idea for accomplishing your goal:
http://www.mtfca.com/discus/messages...tml?1351279141
Because you will be drilling the hole and cleaning up the threads after the cadmium plating operation, the areas where you remove the yellow cad plating will corrode much faster than a standard AN7-21 bolt. Whether or not this matters is a choice only you can make. |
I have done many this way. Just have to be careful the drill bit goes straight, the small ones drift off easily. I drilled each side of the nut separately for that reason.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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12-10-2015, 05:19 AM
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Join Date: Jul 2009
Location: England
Posts: 470
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Quote:
Originally Posted by BillL
I have done many this way. Just have to be careful the drill bit goes straight, the small ones drift off easily. I drilled each side of the nut separately for that reason.
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Good idea to use some cutting oil as well .. any oil is better than trying to drill dry ..
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Jan
Slooow RV6, no hole, builder in UK
Paid up for 2015 ...
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12-10-2015, 03:08 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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When you install it, put a dab of grease on the cotter pin, and you won't have a corrosion problem.
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Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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