Drive shaft orientation

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Robert B
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Joined: Tue Jan 09, 2018 5:41 am
Location: Milwaukee, Wisconsin USA

Drive shaft orientation

Post by Robert B »

Should the drive shaft between the motor and truck be perpendicular
or parallel for smoothest operation?
perpendicular
perpendicular
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parallel
parallel
2.jpg (6.47 KiB) Viewed 404 times

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Bigelov
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Location: Albury Australia

Re: Drive shaft orientation

Post by Bigelov »

Hi Robert,

I have a Piko and Tillig engine apart at the moment. The Piko one has them parallel, while the Tillig has four drive pegs each end, so covers both(?).

The idea is to have the drive as straight as possible, but I think parallel configuration is better. (Going from memory here) With the connecting shaft at an angle, it speeds up and slows down ever so slightly over 180°rotation, but is equalised out with a universal joint at each end. I think having driving shaft and driven shaft at the same angle (ie parallel) would have them travelling at a consistent speed, while the connecting shaft speed varies slightly.

Others may have examples from other locos drive trains. But as Krokodil mentions, I am not sure if it really matters in practice with such small drive trains.
Steve B
Russia in Narrow Gauge
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Richard-B
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Re: Drive shaft orientation

Post by Richard-B »

Point of reference:
The pre-manufactured 'dog bone' connectors (ball-shaft-ball) from NWSL have the 'horns' parallel.

That said... I've seen 'Pro' engine re-builders do it both ways; parallel or perpendicular

YMMV*



* Netspeak for: "Your Milage May Vary..."
Richard Brennan - http://www.tt-west.com
Somewhere between San Francisco and Budapest...

railtwister
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Re: Drive shaft orientation

Post by railtwister »

I’ve always heard they should be parallel, but I can’t quote any definitive resource on the matter.

Bill in FtL

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Rich1853
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Re: Drive shaft orientation

Post by Rich1853 »

In the automotive industry this is call driveshaft phasing and they are in phase (parallel).
Rich1853
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Richard-B
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Re: Drive shaft orientation

Post by Richard-B »

Rich1853 wrote:In the automotive industry this is call driveshaft phasing and they are in phase (parallel).
Thanks for providing the correct terminology!
Here is a nice explanation: https://www.beldenuniversal.com/universal-joint-phasing from a company that makes them!
Richard Brennan - http://www.tt-west.com
Somewhere between San Francisco and Budapest...

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