[modeleng] Re: An innocent abroad---Now brushes
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Mon, 20 Dec 2004 15:58:57 -0800 (PST)
How about the re-placement brushes for Dremel type
tools?
Al Messer
--- alanjstepney <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:
> Tim,
>
> I would suggest a very fine wire, something of the
> order of 36 swg.
> If you have / can get, it, even go down to 42 swg.
>
> Pack in as many turns as you have space for.
>
> The greater number of turns, the more efficient it
> will be, and the higher
> the voltage.
> For your purpose, which I assume to be demonstration
> rather than powering
> something, it really doesnt matter what the voltage
> is.
> Get it running, and then measure it.
> You can always change the voltage if you need to.
>
> I would use enammelled wire, and then immerse it in
> thin hot varnish to
> ensure that the windings are fully coated to prevent
> leakeage across
> windings.
>
> If you have them, there are some excellent articles
> by Edgar Westbury in old
> ME's about making ignition coils, which give some
> useful tips.
>
> I am fairly sure that Maplins still do thin wire,
> but if you get stuck, let
> me know and I will see what I have hidden away.
>
> As for the brushes, carbon rods would probably have
> been used originally.
> Therefore any available "carbon" (I believe they are
> a composite nowadays)
> brush will suffice.
> The "pigtails" that join them to the woring can be
> made from the outer of
> co-ax cable as used for TV aerial wire.
> It scrunches down nicely, and sections can be taken
> out to make it the size
> you want.
>
>
> alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> www.alanstepney.info
> Model Engineering, Steam Engine, and Railway
> technical pages.
>
>
>
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