Lock washer witth teeth useful?
Lock washer witth teeth useful?
(OP)
I know the question has been asked regarding helical lock washers, "Is a lock washer beneficial?" and I have seen the NASA reports and threads on this website with the consensus that NO helical lock washers are in essence useless.
Now, I didn't see anything regarding what I call a star washer.
http://www.mcmaster.com/#lock-washers/=bo70yv
Anyone have any data on the ability of a star or toothed lock washer to provide any locking ability above and beyond the applied torque.
thanks,
Now, I didn't see anything regarding what I call a star washer.
http://www.mcmaster.com/#lock-washers/=bo70yv
Anyone have any data on the ability of a star or toothed lock washer to provide any locking ability above and beyond the applied torque.
thanks,





RE: Lock washer witth teeth useful?
http://www.hardlock.co.jp/pdf/asme2006pvp_jp.pdf
http://www
http://w
RE: Lock washer witth teeth useful?
Good references.
Do you have a copy of asme2006pvp_jp.pdf with the figures?
RE: Lock washer witth teeth useful?
http://ww
RE: Lock washer witth teeth useful?
RE: Lock washer witth teeth useful?
thread404-230741: Studies on the use of lock washers?
FAQ404-1257: Is a lock washer an effective torque retention device?
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RE: Lock washer witth teeth useful?
I worked 14 years as a Design Engineer for a large multinational capital goods manufacturer of food and chemical processing equipment and at least in the food machinery division (where I worked) we were not allowed to use 'star' washers as they were considered unsanitary because they provided a habitate for 'vermin' to grow. We used to us split washers, but eventually went to either upset-nuts (self-locking nuts) and/or Locktite. And on large fasteners, after fully torquing it down, we would simply cross drill and drive a solid pin through the nut/bolt assembly.
John R. Baker, P.E.
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Siemens PLM Software Inc.
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RE: Lock washer witth teeth useful?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Lock washer witth teeth useful?
The figures were at the end of the .PDF file. Figures 10 and 11 just were not labeled properly.
RE: Lock washer witth teeth useful?
http://ww
I have used these in the design of a $40,000 gear case for clamping bearing housings with good results on an underground coal mining machine. One the the selling points was that they are used on army tanks.
Of course correct preload is required. I like 60% of yield.
RE: Lock washer witth teeth useful?
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If we learn from our mistakes I'm getting a great education!
RE: Lock washer witth teeth useful?
You might try contacting Nordlock online and ask them.
It should be an easy test to perform.
If galling is a problem at disassembly, yuo could use anti-sieze compound on the affected surfaces during initial assembly.
RE: Lock washer witth teeth useful?
RE: Lock washer witth teeth useful?
Yeah, will do. Just curious to hear any unbiased opinions.
tmoose,
Not noticeably. There's nothing especially highly loaded in this equipment: the most critcal joints are busbar connections, and copper is obviously fairly ductile so it would deform under very high loadings, but I've followed the threads on locking fasteners with interest. From my perspective if there is no benefit to having a helical lock washer and we can eliminate something which has the potential to be dropped into the gear then I am 100% in favour of it. If we need a locking washer then we should at least have one which works. The number of dropped washers which seem to accumulate in the bottom of a switchboard during its life is quite surprising, and it wouldn't be too difficult for one lodged in the wrong place to initiate a major arcing fault within the board.
Apologies for dragging the thread all over the place. If this discussion is going to develop then maybe we should start a new thread and ask admin to tidy up a bit.
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If we learn from our mistakes I'm getting a great education!
RE: Lock washer witth teeth useful?
RE: Lock washer witth teeth useful?
for locking purposes.