Subject:
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Re: Couplings for long overhang 4 wheeled vehicles
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Newsgroups:
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lugnet.trains
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Date:
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Sat, 11 Sep 2004 12:51:58 GMT
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Viewed:
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2065 times
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I have used various methods, including the magnet holder mentioned above,
though the method below is the best one for long overhangs:
Parts required:
Two Technic plates 2x4 with holes (3709b).
One K3 black elastic band, 18mm diameter, 1.25mm thick.
One 2-stud axle (new type with notches) (32062)
One coupling shoe and magnet (discard the buffer beam).
Method:
1. Put the two 2x4 plates together bottom to bottom, overlapping by 2 studs,
making a 2x6 outline. 2. Put the axle through the hole that lines up.
3. Put the elastic band through the middle hole of one of the plates.
4. Wrap the band round the axle at both sides.
5. Turn the plates one the axle so that the band gets into the notches of the
axle and the plates spring back to straight again. 6. Attach the coupling
shoe to the bottom of the plate that does not have the band through its
middle hole. 7. Set the magnet to the same way round as all the other
vehicles. If you don’t have a turntable, triangular junction or reverse loop
on your layout, it doesn’t matter that magnet polarity is semi-permanent, as
long as magnets on all vehicles are turned the same way. 8. Turn the coupling
device so that the coupling shoe is on top and attach the 2x4 plate to a
bogie or chassis. 9. You can use 2x6 or 2x8 plates with holes instead, to put
the pivot further underneath the vehicle for longer overhangs. I’ve found
that it’s best if the axle pivot is approximately level with the buffer beam
on bogie diesel locos, or that the pivot should be half way between the
magnet and the motor. 10. Avoid the device sticking by fixing to 4 studs
(2x2) on top of the plate and 2 underneath, also keeping adjacent studs free
either side so that the corners don’t catch on anything.
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Like this?
It looks pretty simple an effective, you get just a little bit of movement on
the coupling shoe pivot but not enough to cause jack-knifing. The problem from
my point of view is that its too wide, I am looking for something that comes out
of the centre of the buffer beam rather than below it so I don’t want the slot
too wide. Using the 2x3 magnet holder presented a challenge to attatch it but I
have come up with this
The 2x3
magnet holder is attached using a
43093 Technic, Axle Pin WITH Friction
to prevent it rotating. The
 2736 Technic, Axle Towball
is for
attatching an elastic band to provide centreing. The design can be extended
using an axle and a
 6538b Technic, Axle
Joiner (New Style with X Opening)
Another way of mounting the arm with built in
centreing would be to use a
 bb108
Technic, Axle Joiner Double Flexible
but I havent seen one for real so I don’t
know how well it work.
Tim
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Message has 2 Replies:
 | | Re: Couplings for long overhang 4 wheeled vehicles
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| (...) That's right. The problem with that is you're relying on the strength of the axle and peg friction in order not to pull the couplings apart. With 12-wide stock there's some serious weight to pull! Also, your magnet holder is likely to rotate, (...) (20 years ago, 12-Sep-04, to lugnet.trains, FTX)
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Message is in Reply To:
| | Re: Couplings for long overhang 4 wheeled vehicles
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| (...) I have used various methods, including the magnet holder mentioned above, though the method below is the best one for long overhangs: Parts required: Two Technic plates 2x4 with holes (3709b). (URL) One K3 black elastic band, 18mm diameter, (...) (20 years ago, 9-Sep-04, to lugnet.trains, FTX)
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