Here's a picture of what Toyota use in their prius battery terminals: http://techno-fandom.org/~hobbit/cars/batbox/80corropen.jpg
Notice the nut with the captive bellville washer. They used the same type in their RAV4 EVs. On Wed, Jan 8, 2014 at 7:48 AM, Michael Ross <michael.e.r...@gmail.com>wrote: > Martin, > > I have no experience with the aluminum post cells. But it is just > aluminum. Aluminum is elastic and will not take a set, so it is just fine > for torquing to a level that will not give up. From my POV there is not > much more to be said about it. The use of split washes concentrates the > clamping forces and make the joint less effective. They are a waste of > money and stack height from a design engineer's POV. But if you use them > it is probably not a problem. They only work as a lock after the joint is > completely loose, however; and they don't actually stop the joint from > loosening before that point. The loss of joint clamping force is caused by > materials in the joint stretching or compressing. You won't find a split > washer on a Cat, Deere, Toyota, Ford, you name it product. However they > are popular no denying that. With Al for a threaded member you don't need > hardened washers, because you can't clamp hard enough to get utility from > them. But you do want flat, clean, metal only, parts in the stack. > Belleville washers are not a bad idea, they help maintain clamping force > as a joint loosens. Maybe the Norlocks do some of that too. > > > Dave Roden, > > Head bolts have hardened flat washers. They use large fasteners as and > torque them VERY high to completely take any compliance out of the head > gasket, and many use a torque to yield technique where you don't even > measure the torque* per se *- you torque until the bolt stretches > permanently. With good steel and high quality manufacture you can take a > head bolt into the plastic range and it will not be damaged to cause > failure, if you do this you get the maximum force possible. > > > Lot's of nice replies, but I just hit these two for commenting in the short > time I have right now. > > > On Wed, Jan 8, 2014 at 11:09 AM, EVDL Administrator <evp...@drmm.net> > wrote: > > > On 8 Jan 2014 at 6:03, tomw wrote: > > > > > And while you are at it, remove those lock washers! :^)) > > > > I'm really surprised to hear people say this. I've used split washers > and > > Bellville washers on batteries for 25+ years, and they've done me well. > > > > I also can't recall ever encountering any bolted battery connection on > any > > commercial product that didn't have a lockwasher. And think about it - > > have > > you ever seen any case in a vibrating, lurching vehicle where there > wasn't > > something resilient (a head gasket for example) that lockwashers weren't > > used? > > > > One thing to be careful of is that you want your lug in direct contact > with > > the battery terminal itself, with no washers between them to add > > resistance. > > You add the washer(s) between the fastener and the lug. > > > > Some discussion too of terminal glop. With flooded batteries, I normally > > use petroleum jelly to exclude air and moisture. Many years ago I got a > > free can of some kind of Cosmolene-like spray with an order of USBMC golf > > car batteries. That stuff worked well too and was easy to use. The > key, I > > think, is that I put the goo on AFTER tightening the connection, not on > the > > mating contact surfaces. (Though I've known people who DID use grease on > > mating surfaces.) > > > > I don't think I've ever bothered with grease when using valve regulated > > batteries, however. Maybe I should have, but nothing bad has yet > happened. > > > > To get back to the point, I'm pretty skeptical about washerless battery > > connections. If you try this, please make sure you keep us updated on > how > > it's going over time. For now, though, I'm sticking with lockwashers. > > > > David Roden - Akron, Ohio, USA > > EVDL Administrator > > > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > EVDL Information: http://www.evdl.org/help/ > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > Note: mail sent to "evpost" and "etpost" addresses will not > > reach me. To send a private message, please obtain my > > email address from the webpage http://www.evdl.org/help/ . > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > > > > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > For EV drag racing discussion, please use NEDRA ( > > http://groups.yahoo.com/group/NEDRA) > > > > > > > -- > Put this question to yourself: should I use everyone else to attain > happiness, or should I help others gain happiness? > *Dalai Lama * > > Tell me what it is you plan to do > With your one wild and precious life? > Mary Oliver, "The summer day." > > To invent, you need a good imagination and a pile of junk. > Thomas A. Edison< > http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> > > A public-opinion poll is no substitute for thought. > *Warren Buffet* > > Michael E. Ross > (919) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google > Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > michael.e.r...@gmail.com > <michael.e.r...@gmail.com> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140108/bc05de28/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- www.electric-lemon.com -------------- next part -------------- An HTML attachment was scrubbed... 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