[modeleng] Re: are ye all trying to tell me something...

Hi Julian,

Why put the motor at 90 degrees? I would have thought that it could be 
mounted traversely somewhere about the firebox position.which makes the 
drive and gearing easier. Toothed belts are a good drive although you have 
to watch the wrap around factor to make sure that you have sufficient teeth 
in engagement.The experts reckon that they should not be used where you have 
a large reduction ratio as in the event of overun they can strip teeth off 
the belt but I have been running some for 10 years in locos and never had a 
belt strip yet.

Regards

Clif
----- Original Message ----- 
From: "JULIAN HARRISON" <julianharrison7@xxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, November 18, 2006 8:37 PM
Subject: [modeleng] Re: are ye all trying to tell me something...


> Have not yet fully considered the designs for transmitting the power but 
> your point re worms is totally valid and I agree would not be practical in 
> this instant. rotation will have to go through a gearbox and probably some 
> form of diff to allow the transmission path to be 90 degrees to the motor.
>
>  Can anyone tell me the usual maximum revs of a crankshaft on a traction 
> engine so I can plan the reduction my gearbox will need from the motor. I 
> intend using as few coggs as pos. I may even build a belt into the 
> transmission somewhere.
>
>  Julian
>  In Leicester UK.
>
>
> Clif Walker <clif.gwr@xxxxxxxxxxxxxx> wrote:
>  Hi Julian,
>
> You cannot use a Worm drive as they do not allow for overun. i.e As soon 
> as
> you removed power from the motor unless you are stationary, the wheels 
> would
> try to drive the motor and as a Worm will not drive that way, either the
> wheels will lock solid or something will break
>
> Regards
>
> Clif
>>
>> I intend putting a worm drive on the spiggot and possibly buildong a 
>> small
>> gearbox of two or three gear wheels to give the crank some welly.
>>
>>> ----- Original Message ----- 
>> From: "JULIAN HARRISON"
>> To:
>> Sent: Friday, November 17, 2006 8:49 AM
>> Subject: [modeleng] Re: are ye all trying to tell me something...
>>
>>
>> We don't use soap anymore it's now handwash.
>>
>> Whats wrong with electric? I am considering building a engine in the
>> region of 3" scale. It will have all the bells and whistles of a steam
>> traction engine but not steam. I plan to drive the crank and hence
>> everything else with a 12v motor from a Sinclair C5.
>>
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>> 15:51
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