[modeleng] Re: Motor requirements

My very last email before retiring to bed, so thank you for this information 
on battery discharge (current) rates and poly V belts John. I have a motor 
from a combined washer/drier and that used these V belts, with a small 
pulley on the end of the shaft too. I think that I need to sleep on all of 
this information, and attack the subject from another angle - as it now 
seems that the battery I use may well dictate what sort of motor I can drive 
and therefore what it's unladen speed is, etc, etc.

Hands up all those who can remember "Not the Nine O'Clock News", with Gryff 
Reece Jones, etc. One of their sketches was set in a car factory where every 
one was called Bob, so that all of the cars were built be "Roberts". Looking 
at how many times I have written to say "thank you John", it looks as if 
trains are built by Johns instead! I wonder what percentage of the 
membership are called John, compared to all of the other names put together 
... <VBG>

"G'Night John Boy" ....

Tony.


----- Original Message ----- 
From: "John Pagett" <john_pagett@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, May 29, 2007 9:53 PM
Subject: [modeleng] Re: Motor requirements


> Hi Tony,
>
> Well I wouldn't entertain the idea of a primary (non-rechargeable) 
> battery.
> Firstly I suspect the extra cost of rechargeables would soon be recouped,
> and secondly I don't think that a zinc based battery would be able to
> provide the current required.
>
> Regarding a drive system, what about a poly V belt? They seem to be able 
> to
> grip on some amazingly small pulleys - I had a tumble drier apart the 
> other
> week and the drum drive was a poly V belt. The large pulley was the 
> outside
> of the drum (no grooves !?) and the small pulley grooves were simply cut
> into the motor shaft which was easily less than 1/2" diameter.
>
> Do you remember a 5" tram in Model Engineer? That used the bevel gears 
> from
> a cheap hand drill to get a reduction and a 90° change in direction. Maybe
> the motor could be mounted at an angle to leave room in the "boiler" for 
> the
> batteries. (Maybe the crown wheel would be too big though).
>
> An un-rebuilt Bullied pacific has got a shape that could be made out of 
> wood
> quite easily (I wonder if that's where OVS got the idea??).
>
> Those are my thoughts, Tony. Feel free to accept or reject as you wish.
>
> Cheers,
>
> JohnP
>
>
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