4 ms·
A personal favorite, the Fastener Design Manual: https://ntrs.nasa.gov/citations/19900009424 https://ntrs.nasa.gov/citations/19900009424 In particular >Lockwa
by Modified3019 2y ago
A personal favorite, the Fastener Design Manual: https://ntrs.nasa.gov/citations/19900009424 https://ntrs.nasa.gov/citations/19900009424
In particular
>Lockwashers
>The typical helical spring washer shown in figure 14 is made of slightly trapezoidal wire formed into a helix of one coil so that the free height is approximately twice the thickness of the washer cross section. They are usually made of hardened carbon steel, but they are also available in aluminum, silicon, brome, phosphor-bronze, stainless steel, and K-Monel.
The lockwasher serves as a spring while the bolt is being tightened. However, the washer is normally flat by the time the bolt 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.
- petee 2y agoSomeone on YT did a demonstration on a paint shaker, and the bolts loosen nearly as fast as having none. Internal/external tooth washers or nylocks are the way to go
- cuSetanta 2y agoNordlock washers are the best, but they are expensive and a little space inefficient.
- deleted 2y ago[deleted]
- analog31 2y agoOne useful property is that when partially tightened, they allow slight re-positioning of an assembly, before driving the fastener all the way home. In other words, they're actually used as springs.
- perihelions 2y ago(OCR error: s/brome/bronze/. Just pointing this out as a warning because I read it literally, and was very confused and spent some time search querying silly things).