Ye Gads! I wouldn't like to see that same picture 10k miles from now. Has this pack been submerged or something? Plated steel is a very poor idea! MW
On 8 Jan 2014, at 16:32, Peter Gabrielsson wrote: > 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 <[email protected]>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 <[email protected]> >> 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 >> >> [email protected] >> <[email protected]> >> -------------- 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... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140108/512cfd4b/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) > _______________________________________________ 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)
