Subject:
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Re: New MOC: 4-8-4 Northern
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 9 Jan 2004 13:27:54 GMT
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Viewed:
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1874 times
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In lugnet.trains, Mark Bellis wrote:
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In lugnet.trains, Shaun Sullivan wrote:
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(1) Working pistons; as with the Hudson, there are two per side - the drive
piston and the valve piston. The pistons here actually have the least
friction of any of my designs to date - on straightaways they work
brilliantly! On the curves, the drive wheels do not ride on the rails of
the track, so the pistons do not move.
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Could you try adding Walschaert’s valve gear, as I did with my British Class
9F 2-10-0 and LMS Garratt 2-6-0+0-6-2? You can use the ++ pieces for the
valve gear cranks and a dark grey 3+stud pin for the main rod crank with
model team wheels.
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Hi Mark,
Thanks for the feedback!
I finally tracked down some photos of your trains. With respect to the
Walchaert’s gear, are you referring to the following?
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=334094
I’m having a tough time pictureing your description ... do you have a link to a
clear image?
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I’ve not had tilt problems with my engines, but I usually suspend the wheels
off the rails altogether and use two technic 71427 motors to power them -
gear ratio 8-24c-8-24c-8 at motor level, with 20-12 from the middle 8 tooth
cog down to the driving axle with the valve gear on it. The engine has a
4-wide frame of technic beams, giving holes for gear axles and a strong inner
structure.
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I’ve thought about using motors as you described to turn the drive wheels, so
that they wouldn’t not have to drag along the tracks. The last time I truly
looked at this was with my 0-4-0 in an attempt to attain some working linkages
in very limited space, but I didn’t meet with any success. I should look at it
again here, since I have plenty of room.
You know, it might be that simply adding a motor could solve my problem here; if
the drive wheels are *always* moving, I think they could climb themselves back
up onto the rails quite easily when coming out of curves. The only major
challenge, as I see it, is trying to match the train motor speed with the
technic motor reduced drive wheel speed, so that most of the time (except,
presumably, on the curves) the two don’t have to fight each other at all.
Hmmmmm ...
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This has given me much food for thought
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I was just thinking the same thing! Thanks again for the comments, I’m looking
forward to playing around with some of these ideas!
-s
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Message has 1 Reply:
 | | Re: New MOC: 4-8-4 Northern
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| (...) expansion links but they weren't strong enough, so I reverted to what you see and fixed the motion in forward gear. (...) I wish I had a digital camera to make explaining this easier! I haven't put cranks on my Northern chassis yet, so the (...) (21 years ago, 13-Jan-04, to lugnet.trains, FTX)
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Message is in Reply To:
| | Re: New MOC: 4-8-4 Northern
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| (...) Excellent model - you're a man after my own heart! Great to see someone else building to 8mm:1ft scale or thereabouts! (...) Could you try adding Walschaert's valve gear, as I did with my British Class 9F 2-10-0 and LMS Garratt 2-6-0+0-6-2? (...) (21 years ago, 9-Jan-04, to lugnet.trains, FTX)
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