[modeleng] Re: Motor requirements

Thanks to you too Al, though I did specifically mention this idea of yours - 
we just call them different names over here, usually depending on whether 
their batteries have gone flat at the worst possible time .... :-))

Tony.


----- Original Message ----- 
From: "Allen Messer" <al_messer@xxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, May 29, 2007 9:32 PM
Subject: [modeleng] Re: Motor requirements


> Tony, how about a motor out of a cordless Screw
> Spanner for a power plant?
>
> Al
> --- Tony Wells <oaksfield@xxxxxxxxxxxxxxx> wrote:
>
>> Well, I have finally surcumbed to the lure of the
>> loco, and gone loco! My 3.1/2" gauge train now has a
>> chassis, and both front and rear bogies, all in wood
>> in true Richard Blizzard fashion though, so perhaps
>> I should not be mentioning it here .... <VBG>
>> It is a scratch built 4-6-2, with 3-axle tender, all
>> to be made from polished hardwoods, and not "hard
>> words" as I just mistyped - they will come later! As
>> I am working from the bottom up, I need to decide on
>> the drive train next, so as to be able to design the
>> body around it. The idea is for it to look like a
>> steam loco, but be electrically driven, but more
>> Basset Loake than Hornby Triang, hopefully! With an
>> overall length of nearly 30", at least I have given
>> up on the Basselt Loake clockwork motor idea though
>> .... I am therefore thinking of putting a battery
>> (or batteries) in the tender, with a disguised power
>> cable through to an electric motor in the loco
>> proper.
>>
>> Chatting to Al and Tel off list, I have come round
>> to the idea of either a cordless electric drill or a
>> recycled windscreen wiper motor, though whilst out
>> shopping today, I saw some of the big 6-volt zinc
>> lamp batteries, the ones (very) approximately 2"
>> square and 3" high, for only £2 each and so may look
>> into a 6-volt motor as well. I had thought about
>> trying to find such as a small motocycle battery to
>> fit into the tender, but decided that the additional
>> weight made matters worse, not better, taking me
>> into the lands of diminishing returns, incidentally.
>> My problem is that while I have the bit of garden
>> where the fruit trees are for some track, it is only
>> 30' x 40' at the most, and so it would be a very
>> twisty one at this size, round those trees, and so
>> what design speed should I aim for please, so that I
>> can determine how powerful a motor will be required?
>>
>> From my working days, the clearance times for
>> pedestrian crossings were based on 1.2 metres (4
>> feet) per second, so should my train go faster or
>> slower than that, bearing in mind the lack of long
>> straights where an express could be wound up to
>> maximum speeds? Should I be able to keep up / catch
>> up with it in the event of an accident, such as when
>> Unka Jesse fell off his and could then only watch it
>> disappear into the distance until it (literally) ran
>> out of steam ? As my driving wheels are 2.1/2"
>> diameter, I did a bit of mental arithmetic to work
>> out that at 3mph, a brisk walking pace but not
>> rushing, the wheels would be doing around 225rpm.
>>
>> If I was to use a cordless drill with a natural
>> speed of 900rpm to 1,000rpm, it would need to be
>> greared down rather than using the standard sort of
>> speed control, as these are inclined to over heat if
>> used for a prolonged period of time. I would need a
>> pulley ratio of 4:1 if I was to use the flexible
>> drive belt that I am looking for. 1" to 4" would
>> give me problems in housing the 4" pulley, whereas
>> 1/2" to 2" might well give me slippage problems on
>> the 1/2" one, however. Physical gears has (for me)
>> the problem of achieving alignment as well as
>> maintaining it due to possible moisture movement of
>> the timber frame and chassis. This as well as being
>> far noisier, though nylon gears might get around
>> that if they could take the loadings.
>>
>> I am open to any help, ideas and suggestions that
>> the Group may come up with, please, but precision
>> engineering is just not possible for me I am afraid,
>> as bittter experience has shown far too often.
>>
>> Thank you,
>>
>> Tony.
>>
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>
>
>
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