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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Sun, 12 Sep 2004 20:54:10 GMT
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Viewed:
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2205 times
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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, even using an axle pin with friction, due to the forces of the heavy
> train.
>
> You could vary my method by replacing one of the 2x4 plates with a 5L, 6L or
> 7L 4mm wide liftarm, attaching the end to the stud of your magnet holder. I
> did this on my tube wagons (sorry no pictures).
>
> The result is an arm 8mm wide x 4mm high, with a magnet holder on the end.
> The liftarm and magnet holder make a good joint, with the joint being at
> right angles to the pulling force, and I've had no problems with sustained
> running of 6 tube wagons. I also use the liftarms on other permanent rakes
> of stock, sometimes extended with 1-wide plates.
>
> Mark
I had considered the problem of relying on the friction of the axles/pegs. My
thoughts were that the magnet to magnet join would actually be the weak link,
although the coupling assembly might pull apart a little at a time with use.
Presumably your experience with heavy vehicles has proved otherwise.
I don't quite understand your alternative design, do you mean attach the Technic
liftarm to the stud of a 2x3 magnet holder? If so do you find the one stud
connection strong enough? If I've misunderstood, sorry!
Tim
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Message has 2 Replies:
 | | Re: Couplings for long overhang 4 wheeled vehicles
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| Mind you, having had a look at my prototype again, it seems it used a centre buffer and side chains, the problem with that of course, is that for Lego 'corners' the chains would have to be so long they would drag on the track! Tim (20 years ago, 12-Sep-04, to lugnet.trains)
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Message is in Reply To:
| | 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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