[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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