The $250,000 omnidirectional P2 speakers have a wrong direction spring washer. The thread is left hand and the washer is meant for the right hand. This will make the washer bite during tightening, which it should not.
https://www.youtube.com/watch?v=G5EMrFsT7V4
https://www.youtube.com/watch?v=G5EMrFsT7V4
The effectiveness of helical spring washers has been in debate for a very long time. I doubt the thread direction will make a difference as it's only relying on spring force to help hold the nut.
From NASA's 1990 "Fastener Design Manual"
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900009424.pdf
"The lockwasher serves as a spring while the bolt is being tightened. However, the washer is normally flat by the time the is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent. In summary, a lockwasher of this type is useless for locking."
From NASA's 1990 "Fastener Design Manual"
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900009424.pdf
"The lockwasher serves as a spring while the bolt is being tightened. However, the washer is normally flat by the time the is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent. In summary, a lockwasher of this type is useless for locking."
I didn't get where I am today listening to the likes of my learned friend Johnson or NASA but got my mechanical myths de-programming in actual commercial production where testing was done to save tiny tiny amounts of money, but over long term. The handedness or perceived barbed locking effect of the split surfaces is indeed illusory at these scales, hardnesses, and tolerances, so no better than a flat washer.
But the reality is the split washer is an awesome way to make a very cheap washer from wire stock.
But the reality is the split washer is an awesome way to make a very cheap washer from wire stock.
- Status
- Not open for further replies.