AFAIAC on aluminium or any fairly soft material which is fastened with a
steel bolt you first use a thickish flat machined steel washer with an
OD of about 3 times the bolt diameter, then a lock tab washer, (split
lock washer if you must) or, if that is not used, locktite or a nylock
nut. For very critical applications use lockwire.
Kees Oudesluijs
NL
Bob Spidell schreef:
> re: "I know racers and aviation don't trust lockwashers"
>
> Neither did Carroll Smith. I think with aircraft the issue is that if
> for some reason the fastener loosens with a lockwasher, it'll
> eventually come loose. Safety wiring all but prevents that from
> happening. Also, the point of properly torquing a bolt is to apply
> the correct tension by stretching the bolt; if you use a lockwasher
> that may not be possible (AFAIK, safety wiring is not meant to keep
> tension on the fastener, just to keep parts from coming apart).
>
> That said, I think lockwashers have their place. For instance, I
> began using hardened flatwashers with locktite on aluminum parts, like
> the shock mounts (I know, the shock bodies are a "dirty" Al/Zn
> compound). However, when I tried that on the rear shock mounts the
> bolts would loosen without a lockwasher under the nut.
>
> Note that safety wiring is a skill; aircraft mechanics spend quite a
> bit of time learning how to do it properly (see: FAA AC43-13). I
> suspect most shadetree mechanics aren't quite as well trained.
>
>
> bs
>
>
>
> Steve B. Gerow wrote:
>> Richard Mayor wrote:
>>
>>> Belleville washers are not going to help keep shock bolts tight. Proper
>>> tightening, using flat washers, will do the trick.
>>
>> With respect, when the bolts are torqued down, the belleville washers
>> _are_ flat washers. Though the wikipedia article doesn't talk about
>> them much as lockwashers, they're used extensively in Alfas as
>> lockwashers and that's why I started using them against aluminum
>> surfaces in the Healey. None of my 3 Alfas ever used a split-ring
>> lock washer on an aluminum surface, as Healeys do.
>>
>> FWIW - air cooled VWs use wave washers a lot on the engine - I wonder
>> if they act differently from bellevilles.
>>
>> I know racers and aviation don't trust lockwashers - undoubtedly with
>> good reason, but they seem to work pretty well on everyday cars.
>>
>>
>
> *******************************************************************
> Bob Spidell San Jose, CA bspidell@comcast.net
>
> *******************************************************************
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
>
> Healeys@autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> You are subscribed as coudesluijs@chello.nl
>
> http://www.team.net/archive
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.94/2367 - Release Date: 09/13/09
>05:50:00
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
http://www.team.net/archive
|