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12-17-2018, 09:38 AM
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Join Date: Mar 2018
Location: Conifer, CO
Posts: 33
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Cotter pin vs. safety wire
I need some help, I had the main wheel bearings replaced by antisplat and the result is a hub that is about an 1/8? bigger than the original. The cotter pin no longer lines up and I was advised to just sand down the axle nut so the cotter pin would fit. My question is, safety wire (doubled up) and wrapped around the nut fits without sanding, is this acceptable or am I better off sanding the nut down and using a cotter pin?
Thanks,
Dan
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RV-6A N60KD
Navy Vet
Donation made for 2020
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12-17-2018, 09:50 AM
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Join Date: Mar 2010
Location: Scappoose
Posts: 119
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You could also drill new cotter pin holes in the axle. Just drill a bit offset from the original and you will be good.
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12-17-2018, 09:55 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by Richard@Langair
You could also drill new cotter pin holes in the axle. Just drill a bit offset from the original and you will be good.
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Yep, this one.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-17-2018, 11:21 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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Consider how easy it is to cut through safety wire versus that huge cotter pin, which is designed for shear strength.
The hole that is there now had to be drilled by the builder.
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Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
Last edited by Raymo : 12-17-2018 at 11:29 AM.
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12-17-2018, 11:29 AM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,005
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I have opened the cotter pin hole into a slot on numerous planes. It still effectively locks the nut and allows adjustment where sometimes the original installation didn't. & it still allows use of the 1/8" cotter pin.
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Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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12-17-2018, 01:01 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by dbegeman
I need some help, I had the main wheel bearings replaced by antisplat and the result is a hub that is about an 1/8” bigger than the original. The cotter pin no longer lines up and I was advised to just sand down the axle nut so the cotter pin would fit. My question is, safety wire (doubled up) and wrapped around the nut fits without sanding, is this acceptable or am I better off sanding the nut down and using a cotter pin?
Thanks,
Dan
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If you don't want to sand the nut, use a shim.
One flat turn is equal to a 0.010 inch shim. Get a scrap of 0.020 aluminum and sand if down until you get the position you want. Sandpaper simply placed on a hard steel surface should do the job.
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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12-17-2018, 05:58 PM
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Join Date: Mar 2018
Location: Conifer, CO
Posts: 33
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So drilling another hole in the axle or widening the original hole would not cause any structural issues or cause any stress cracks in the axle down the road?
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RV-6A N60KD
Navy Vet
Donation made for 2020
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12-17-2018, 07:14 PM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,005
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Use a dremel tool to elongate the hole in the axle NUT. Or drill a new offset hole in the axle. Do not widen the existing hole in the axle.
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Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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12-17-2018, 08:50 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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I have two pairs of holes in my axle, as I change between wheel/tire sizes. Doubt it will be an issue as those axles are pretty stout.
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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12-18-2018, 11:46 AM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by az_gila
If you don't want to sand the nut, use a shim.
One flat turn is equal to a 0.010 inch shim. Get a scrap of 0.020 aluminum and sand if down until you get the position you want. Sandpaper simply placed on a hard steel surface should do the job.
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Wait, how would that help? He needs to make the nut shorter (one option) in order to engage the hole in the axle. A shim effectively makes the nut *longer* (I used some peelable shim from McMaster on one axle that developed a little sloppiness a while back).
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