Not to revive an old argument or beat a dead horse but,
I just had to share what I found on 95D's gear leg. I got a chuckle.
It wont be like this when it goes back together.
Washer stacking
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Re: Washer stacking
All those washers and the near bolt does not have at least 1 1/2 threads showing!
John E. Barrett
aka. Johneb
Sent from my "Cray Super Computer"
aka. Johneb
Sent from my "Cray Super Computer"
Re: Washer stacking
LOL. I had already started to take that bolt off when I though to take a photo for posterity.johneeb wrote:All those washers and the near bolt does not have at least 1 1/2 threads showing!
Re: Washer stacking
To be accompanied by the polished wheel pants I havec170b53 wrote:Oooh...backing plates.....
- MoonlightVFR
- Posts: 624
- Joined: Sun Jan 02, 2005 5:55 pm
Re: Washer stacking
Puzzling, why stack washers?
If the bolt was too long what bolt should be installed?
Was someone trying to adjust caster or camber?
Regards
If the bolt was too long what bolt should be installed?
Was someone trying to adjust caster or camber?
Regards
gradyb, '54 B N2890C
- Bruce Fenstermacher
- Posts: 10313
- Joined: Tue Apr 23, 2002 11:24 am
Re: Washer stacking
Answering the questions in reverse:MoonlightVFR wrote:Puzzling, why stack washers?
If the bolt was too long what bolt should be installed?
Was someone trying to adjust caster or camber?
Regards
3. Yes, likely they were adjusting camber or caster or perhaps just replacing an axle.
2. Best practices specify a shorter bolt should have been installed.
1. Because bolt lengths are standard but those items dimensions the bolts are being used with rarely fit precisely within a standard grip length, washers are installed so nuts do not bottom out on the end of the thread before the bolt is properly tightened. Best practices, which mechanics are obliged to follow by the FARS unless other wise allowed, says that only so many washers should be stacked and only so much thread should protrude through the nut yet there is also a minumum threads showing through the nut standard.
As manufacturers do not have to follow best practices, over the years, specially in older aircraft, you can find situations where one can not acquire a bolt whose grip length is such that one can meet all the best practices of stacked washers and threads showing. Back then, they used common sense, when stacking washers and how many threads protruded through the nut, something not found in abundance today where everything has to be spelled out in a book or manual with no room for common sense.
David's examples show someone who did not follow best practice nor did they get as close as they could have.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com