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Model Forum / General / Models / October 2004BA
I'm an electrical engineer. We use (or used) even BA szes for terminals. I have many sets of enven number BA spanners, sockets, nut runners etc. I'm now building a steam engine and everthing is ODD BA sizes. Why!!! Henry, >I'm an electrical engineer. We use (or used) even BA szes for >terminals. I have many sets of enven number BA spanners, sockets, nut >runners etc. I'm now building a steam engine and everthing is ODD BA >sizes. Why!!! I think it is because 5 and 7BA are close to the Imperial 1/8" and 3/32" diameters. Like you, I've had to buy 5 and 7BA sets for Stuart Turner models :-) Jim. > I'm an electrical engineer. We use (or used) even BA szes for > terminals. I have many sets of enven number BA spanners, sockets, nut > runners etc. I'm now building a steam engine and everthing is ODD BA > sizes. Why!!! Is it perhaps because they work out nearer the scale ratio for the model that you are making ? AWEM > > I'm an electrical engineer. We use (or used) even BA szes for > > terminals. I have many sets of enven number BA spanners, sockets, nut [quoted text clipped - 3 lines] > that you are making ? > AWEM As an Ex-BT Electro-Mechanical telephone engineer ISTR being told that the odd BA sizes tended to be used for mechanical use & Even BA for Electrical terminals. -- Dave Croft Warrington stuart turner use the odd sizes as the heads look more to scale, howeve you can also get even BA sizes with smaller sized head -- bolma > > > I'm an electrical engineer. We use (or used) even BA szes for > > > terminals. I have many sets of enven number BA spanners, sockets, nut [quoted text clipped - 10 lines] > Dave Croft > Warrington Electronics (in the '60s) used even BA sizes, electrics (mains plugs and sockets, for example) used odd BA. To bridge the gap, Radiospares (now RS Components) supplied a small box with the interesting title 'Odd Screw Kit'. > I'm an electrical engineer. We use (or used) even BA szes for > terminals. I have many sets of enven number BA spanners, sockets, nut > runners etc. I'm now building a steam engine and everthing is ODD BA > sizes. Why!!! Two of the possible reasons are: Electrical equipment tends to use even no's, whereas mechanical sometimes seem to use odd no's. Scale models often use 'one size smaller' nuts and screw heads - so a 5BA thread has a 6BA head/nut diameter etc. Other than those possibles, I haven't a clue! Regards Mark |
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