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Geared Steam Locomotives - 1:87 Scale
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 Posted: Thu Aug 19th, 2021 05:37 pm
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corv8
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Alain Feypel wrote: 
https://www.youtube.com/watch?v=Hb_pNAX-RSw


I notice, that the jackshaft runs in reverse direction.

I assume this is by intention ? 




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Gerold
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 Posted: Fri Aug 20th, 2021 07:18 am
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Alain Feypel
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corv8 wrote:
I notice, that the jackshaft runs in reverse direction.

I assume this is by intention ? 


Intention, Yes.  Planned, hmm not really.


When I first looked at the patent drawings,
I noticed that the axles within the trucks would be contra-rotating,
as they put the bevel, of one axle of each truck, on the wrong side.

The detail drawing was correct,
except that the drawing is just right for one truck, either front or rear.
The second truck would need the bevel gears, on the other side of the axle.

So for me it wasn't really clear from the drawing,
the text said that both trucks are built the same,
but if that was the case, one truck would run forward, the other in reverse.
(Don't ask how I know that)


So for my model, I had the jackshaft running in the forward direction.
 
But there must be a flaw in the gears, as it didn't run smooth enough,
even trying with different washers under the bearings,
or I made a mistake in the gear meshing thing.

So I put the whole axle in the box the other way around,
and it ran better, and I left it that way.

Then while reassembling the trucks after painting,
I tried to correct it by flipping the axles, then it ran even worse,
and I was fed up with readjusting gears every time I worked on the axles.


Maybe it would have been easier to use the Bachmann gears,
instead of replacing them with different ones.


So long story short, the jackshaft runs in opposite direction,
because that way it runs better.

And maybe it was like that in reality.

The Davenport fixed frame locos,
also had the jackshaft running in the other direction.


Alain


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