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

A crankshaft on a full size engine will turn at between 150 and 300 rpm.
I believe that a common speed for agricultural engines when governed is 160 
rpm.

Alan
----- 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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