[modeleng] Re: Where are you all?

Just be aware that using a mains dimmer to feed an inductive load may lead
to overheating in the transformer.

You should be able to build a simple variable 12v dc supply from 3 or 4
components.  That's the way that I did it last time.

Cheers

Peter



On Wed, 17 Sep 2008 11:19:50 +0000, "Jeff D" <jeffdayman@xxxxxxxxxxxx>
wrote:
> 
> Hi Shep,
> 
> Another idea I have used for getting variable DC 0-12V is to find a model
> train controller. The ones for HO or OO trains are cheap and some put out
> up
> to 6A. Their rheostats are usually very smooth.
> 
> The mains dimmers used as you mentioned also work great.
> 
> Cheers Jeff Dayman
> 
> 
>>From: "Shep" <shep.28@xxxxxxxxxxxx>
>>Reply-To: modeleng@xxxxxxxxxxxxx
>>To: "Modeleng" <modeleng@xxxxxxxxxxxxx>
>>Subject: [modeleng] Where are you all?
>>Date: Wed, 17 Sep 2008 11:56:57 +0100
>>
>>Hello everyone.
>>Where are you all - on holiday - or beavering away in the workshop?
>>There have been very few messages this month.     Please send us some
> chat.
>>
>>I have been slowly progressing with the construction of my little lathe -
>>finished the leadscrew and the clasp-nut mechanism.   I am now rigging up
> a
>>car wiper motor at the tailstock end of the lathe, to drive the leadscrew
>>via a belt.    The idea is to be able to vary the speed of the leadscrew,
>>whilst actually turning.     I am using a 12V DC battery charger as a
> power
>>source,  but found it difficult and expensive to locate a suitable robust
>>speed control - eg a wire-bound rheostat.    I then attacked the problem
> in
>>a different way, and interposed a mains lamp dimmer which I had in stock,
>>between the mains power source and the battery charger.    This works a
>>treat, and gives a smooth variable-speed drive.   Problem solved at no
>>cost!
>>
>>Next problem: the geared screw-cutting mechanism - a tight design on a
>>lathe with a 2" centre height!
>>
>>Cheers!  from Hubert in autumnal St Albans.
>>MODEL ENGINEERING DISCUSSION LIST.
>>
>>To UNSUBSCRIBE from this list, send a blank email to,
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>>line.
> 
> 
> MODEL ENGINEERING DISCUSSION LIST.
> 
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