[modeleng] Re: Where are you all?

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.
>
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