[SEL] semi - ot lock washer questions for engineers

[kgw]

I was not around for the previous episode, but there IS some interesting 
stuff here---and I am trying to keep my mind off my little brother down 
in Morgan City today!!

How many lock washers have you seen used for serious aps, such as head 
bolts??  Very few.  This goes right along with Curt's statement "...they 
really are not needed for properly sized and torqued bolted connections. 
Hardened flat washers in conjunction with correct nuts and proper 
preload is as good as it gets."

Hmmm....  And I CAN see how the square nuts might not pull down 
snugly----but if turned over, they would pull down much easier.

Helen---Methinks Curt might need some quick advice & help here....

Gene
Elgin, Illinois USA


bill at antique-engines.com wrote:

>OK, Curt - to protect you a bit we'll leave out the square nuts part and
>concentrate on the split type lockwasher on ANY fastener, hex, square, and
>so on. Don't need to smell human flesh being scorched again!  :-)
>
>We'll restrict it to lockwashers only for personal safety reasons!
>
>My Chapman uses a thinner version of the split lockwasher on almost every
>bolt. But that was 90 years ago..............
>
>Bill
>
>  
>
>>Bill,
>>Oh here we go again! Sometime back I made the statement that lockwashers
>>were indeed useless devices. Several flame making devices were aimed my
>>way. But reading any good engineering text on bolted connections will
>>quicky show that 
>>
>>In the connections that works loose and are rattling around there is
>>probably some merit to using lockwashers however.
>>
>>Part of the reason I was flamed so badly was my bold statement that the
>>rounded edge of square nuts should go against the part being clamped.
>>That debate has raged on a while and I remained convinced that there is
>>merit to this method. One reason lock washers may have become so popular
>>is that when using square nuts to bolt structural steel together, the
>>square nuts will dig into the steel making tight connections difficult.
>>By putting a small OD lockwasher under it this keeps the corners from
>>digging in. However, by turning the nut over and putting the rounded
>>side down, then you don't need the usless lockwasher anyway.
>>
>>I could try and dig up the washer info if you like. For now I'm prepared
>>with Nomex suit on :-)
>>Curt Holland
>>Gastonia, NC
>>P.S. Use Loctite or ESNA nuts if you want secure non-high strength
>>bolted connections.
>>
>>bill at antique-engines.com wrote:
>>
>>    
>>
>>>Debate flaming on in some forums:
>>>"Split-type lockwashers" good, bad, worthless or worthwhile?
>>>Some claim they are worthless and modern farm machinary, autos, engines
>>>and other equipment don't use them because they are worthless (not due to
>>>cost savings)
>>>
>>>Others claim it's due to cost savings.
>>>
>>>Are they worth using, do they do any good?
>>>If so, what applications do they work in, which do they not work in?
>>>Can you support or back up your claims?
>>>
>>>I've always used them and can't say they do any harm, but I also can't
>>>say
>>>it would work just as well without them because I haven't done
>>>side-by-side experiments.
>>>
>>>Bill
>>>Runnells, IA
>>>(where things may be coming apart due to lack of lockwashers?)
>>>_______________________________________________
>>>SEL mailing list
>>>SEL at lists.stationary-engine.com
>>>http://www.stationary-engine.com/mailman/listinfo/sel
>>>
>>>
>>>
>>>
>>>      
>>>
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>>    
>>
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