On Aug 20, 5:11 pm, Austin Shackles
 wrote:
> On or around Wed, 20 Aug 2008 01:56:23 -0700 (PDT), houstonceng
>  enlightened us thusly:
>
> [mucho snippage, will study it all later]
>
>
>
> >Regards
> >Andy
>
> It's too bloody invovled.  Why doesn't someone just sell a box with
> forward-stop-reverse buttons and switchgear in it?  It's a piece of piss to
> get stop-start boxes...
>
> The forward and reverse on this motor is just a case of connecting it the
> other way around, and it can be done with a single DPDT switch.  But finding
> them, in sufficient current range, is far from trivial.
>
> I did find 30A relays somewhere for a good sounding price, so that will be
> the way to go.  I'll have a think about the circuit.
>
> --
> Austin Shackles.  www.ddol-las.net my opinions are just that
> Travel The Galaxy!  Meet Fascinating Life Forms...
> ------------------------------------------------\  
>    >>  http://www.schlockmercenary.com/ <<      \  ...and Kill them.
> a webcartoon by Howard Tayler; I like it, maybe you will too!

I suppose that the reason for the scarcity of Fwd-Rev-Stop control
gear for single-phase motors is that, in general, industry uses 3-
phase motors and control-gear and manufacturers/suppliers must,
ecconomically, serve the bigger market.

I'm a little worried by your statement, "The forward and reverse on
this motor is just a case of connecting it the other way around, and
it can be done with a single DPDT switch."  If this is a single-phase
(induction) motor - as you appear to say in your first posting -
reversing requires the "Start Winding" to be reversed relative to the
"Run Winding" - not the whole motor connexion reversed wrt Mains.
This is a single-phase induction motor we're talking about and not
some other type ?

If it's a brushed - so called universal - motor, it would still not
reverse if the live and neutral were swapped.