AAA dummy battery
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From: ian field on 9 Jul 2010 15:23 "Dawn" <dawn.laciak(a)gmail.com> wrote in message news:34cf627c-8137-4995-84c8-329826ee55b6(a)z10g2000yqb.googlegroups.com... > Does anybody know where I can purchase a AAA dummy battery (or many) > online? Whiskered (shorted) NiCd cells are good for this. If you want to make sure, bridge over the seal with some solder - you'll need plumbers flux to solder the stainless jacket (alusol also works).
From: Robert Baer on 9 Jul 2010 17:17 Winston wrote: > On 7/9/2010 9:56 AM, D Yuniskis wrote: >> Winston wrote: >>> On 7/9/2010 8:16 AM, Dawn wrote: >>>> Does anybody know where I can purchase a AAA dummy battery (or many) >>>> online? >>> >>> Can you provide a little more information please? >>> Are you substituting a 'wall wart' power supply for >>> battery power, for instance? >>> >>> Are you creating props for a show? >>> >>> These have different answers. >> >> The "dummy" AA (not AAA) "batteries" that I have are used >> in place of *real* "batteries" as "place holders". >> >> E.g., 8 alkalies + 2 dummies = 10 NiCd's > > For that particular application, I would contact my > friendly local machinist. Have her part off some > 1/4" copper tubing to the proper length, solder > plugs into both ends, clean it to within an inch of > it's life and then place it into an electroless tin > bath for a day or so, then clean it off and use heat > shrink tubing to insulate the outside. > > But that's just me. > > --Winston > Too much trouble..use aluminum rod cut to length and shrink wrap.
From: Winston on 9 Jul 2010 17:37 On 7/9/2010 12:21 PM, D Yuniskis wrote: (...) > Why not just turn down a solid *bar*! :> Cu tubing is cheap and available everywhere. (...) > Actually, the ones I have are castings. Look more like > a (flat) bar with two discs on either end. When I first > encountered them, they were half way to the trash bin > before I realized their significance! <:-/ One could also crimp a straightened solid copper wire through the center of a 3/8" dowel. --Winston <-- Thinks lathes are Cool.
From: Winston on 9 Jul 2010 17:50 On 7/9/2010 2:17 PM, Robert Baer wrote: (...) > Too much trouble..use aluminum rod cut to length and shrink wrap. From: http://en.wikipedia.org/wiki/Aluminium_oxide#Properties "Aluminium oxide is an electrical insulator.." "Metallic aluminium is very reactive with atmospheric oxygen, and a thin passivation layer of alumina (4 nm thickness) forms in about 100 picoseconds on any exposed aluminium surface." One would have to install them *very quickly* :) --Winston
From: D Yuniskis on 9 Jul 2010 18:03 Winston wrote: > On 7/9/2010 12:21 PM, D Yuniskis wrote: > > (...) > >> Why not just turn down a solid *bar*! :> > > Cu tubing is cheap and available everywhere. Yes, I was being facetious. ;-) I once (as a kid) asked for a length of "cold rolled" to use as an axel in a go-kart I was building. Dropped by his (machine) shop the next day to find a guy turning my axel -- complete with keyways, and threaded ends predrilled for cotter pin locks! I suspect the labor in that axel was worth more than the rest of the go-kart! :-/ >> Actually, the ones I have are castings. Look more like >> a (flat) bar with two discs on either end. When I first >> encountered them, they were half way to the trash bin >> before I realized their significance! <:-/ > > One could also crimp a straightened solid > copper wire through the center of a 3/8" dowel. > > --Winston <-- Thinks lathes are Cool. Unfortunately, they ^^^^^^^^ are the type of tool that quickly put you into the "everything looks like a nail" mentality (except, of course, *not* a nail! :> ) Kinda like once you play with a router you find yourself using it in place of a *saw*, etc.
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