Subject:
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Re: Universal Joint Modifications for Train Applications
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 8 May 2004 22:21:24 GMT
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Viewed:
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1717 times
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In lugnet.technic, Luis Hernández wrote:
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In lugnet.technic, Mark Bellis wrote:
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For those unaware, a Shay engine has a 3-cylinder engine hanging over one
side of the loco with jointed extending shafts running the length of the
loco to 2 or 3 bogies. In principle this requires 6 uni joints and 3
extension devices. The problem with the Shay is to get the flexible
transmission into a very short length (I’m aiming for 8 studs or less), yet
extending and contracting by 2.5 studs as the bogie turns.
Any ideas for alternative solutions that fit the above spec are most
welcome.
Mark Bellis
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For what I can read, it seems to be a good use for the broken u-joints (yes,
they are toooooooo long)... but, can we see the piece modified? It may help
looking for an alternative solution. An also, where can I see a Shay engine?
I’ve never heard about it.
Thanks a lot,
Luis 
(comments, instructions, death threats, etc. please remove all the X’s)
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There are pictures of Shays at:
http://www.cassrailroad.com/locos.html
Shay #6 is the one I’m building a model of, as its wheels are bigger than on
most others (4ft rather than 3ft), so the BBB wheels (3’9” in 8mm:1ft scale) fit
better.
So far I cut up 6 5L axles into 3.5L and 1.5L lengths. The 3.5L ones are used
for the wheels that have 20 Tooth bevel gears on them - they need an extra 0.5L
of axle to hold the bevels and are held in the bogie in an axle extender, with a
3L axle the other side for the other wheel. The 1.5L axles are used on the
transmission shafts. Conveniently, there are 6 3.5L axles for the 6 wheelsets
and 6 1.5L axles used 2 at a time on the transmission shafts - 100% utility of
modified parts.
A uni joint with one end modified is about 3.2L long, having lost 0.8L of axle
holder at one end. Sorry, no digital camera yet :-( The unmodified end has a
1.5L axle to hold a 24mm pulley for the extending part of the transmission. The
modified end has a shorter piece of axle, modified with a thin round end like
flex tube, to go into the 1/8” hole.
I have to take account of clearances when judging what length of axle to modify
for the modified end of the uni joint. I’ll have to calculate how much I can
remove from the total length of the transmission and still get it to work.
Mark
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Universal Joint Modifications for Train Applications
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| (...) For what I can read, it seems to be a good use for the broken u-joints (yes, they are toooooooo long)... but, can we see the piece modified? It may help looking for an alternative solution. An also, where can I see a Shay engine? I've never (...) (21 years ago, 7-May-04, to lugnet.technic, FTX)
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