G Scale Model Train Forum banner
1 - 20 of 53 Posts

·
Registered
Joined
·
970 Posts
Discussion Starter · #1 · (Edited)
Guys,
I have not posted here for a very long time for different reasons. Currently I am working on a new project, a cog loco in 1:22.5. I chose this scale as I plan to return to Germany in a couple of years. The loco is a model of the first combined rack/adhesion narrow gauge engine built by a Swiss company. It was an industrial switcher and did not have the tilted cab as other rack locos. So I can run it on ordinary track and then branch out to the rack-equipped line. Most of the readers here are not very interested in builds if they are not American prototypes or BIG. So I am reluctant to post it here, though it is technically very challenging. It is small, with an unusual Gooch valve gear (designed using the Dockstader program and Alibre simulation) between the frames and the kinked side rods to get the cog wheel to clear the rails on switches. It was also pretty difficult to design a gear, which meshes with the LGB rack and also a pinion for speed reduction. Another challenge was to match the cog pitch diameter with the diameter of the driving wheels. A complete build thread is here (in German, but with lots of pictures) http://www.buntbahn.de/modellbau/viewtopic.php?t=13117
A set of drawings was found in an old brochure: https://books.google.com/books?id=q...v=onepage&q=zahnradlok wasseralfingen&f=false
The drawings are towards the end, so scroll down.
Currently the chassis runs on air, the boiler and burner/gas tank are finished and I am working on the boiler fittings/piping. If you guys are at all interested, I will post some of the progress here. So here is a picture:




Regards
 

·
Registered
Joined
·
970 Posts
Discussion Starter · #4 · (Edited)
Where did you get those wheels?
I designed the wheels in Alibre and then Dennis cut them on his CNC mill. The material is precision ground flat steel. By the way, I helped Dennis with the soft/hardware in modifying his mill, which took some time - one of the reasons for not posting here. Since then we (Bill Allen and me) are regulars in his workshop and extremely grateful for his help. Here is a view of the crammed chassis with the Gooch valve gear. Most joints have tiny ball bearings (about 0.04"(1mm) ID and about 1/8" (3mm)OD), to minimize lost motion.
Regards

.
 

·
Premium Member
Joined
·
1,099 Posts
Been following your post on the "Buntbahn forum" ,i am impressed with your quality build loco! Bill,Henner and a couple more master builders always catch my attention ,its a "must read" issue!!!
Thanks for posting,
Manfred
 

·
Premium Member
Joined
·
1,099 Posts
May i ask who is carrying those mini bearings?
Manfred
 

·
Premium Member
Joined
·
1,099 Posts
Thanks,Henner! Order already placed!
Manfred
 

·
Registered
Joined
·
1,490 Posts
GUYS

If you haven't gone to the Buntbahn link in the top posting, You should do that when you have a little time to examine the pure craftsmanship by Henner and Dennis.
I have been lucky enough to have seen the build from the start with the inventive ways they have approached every step. It is in German, but at least on my computer, there is a translation block the the top.
 

·
Premium Member
Joined
·
2,869 Posts
Henner,
So, what are you doing about the 'rack'?
I see something in the first picture, and it looks to be plastic.
Wonderful engineering.
Regards,
David Leech, Delta, Canada
 

·
Premium Member
Joined
·
2,951 Posts
David;

It appears to be a section of the rack rail LGB used with their rack locomotives. I don't know whether it is still made, but it was quite durable.

Regards,
David Meashey
 

·
Registered
Joined
·
970 Posts
Discussion Starter · #14 ·
@Bill,
thanks for the kind words. In fact, we are both part of a Saturday workshop. This informal get-together is a valuable source of information and knowledge exchange.
@David,
this is the rack I use:
https://www.onlytrains.com/model/tr...NuPPCHXn9Gn5t7BC_SUvQillZDXhh-khoCIz0QAvD_BwE
It seems to be quite durable (glass fiber reinforced?) and clips to any LGB track and even can be curved (R3 at least). Unfortunately the pitch is not to any standard, so we designed our own gears. Dennis had a program which allowed us to manipulate all the parameters of a gear. We then cut these with the laser out of acrylic and checked how they meshed.

Regards
 

·
Premium Member
Joined
·
1,507 Posts
Henner, It is great to see you back on this forum. Your project looks fantastic! Please keep posting and I will be looking forward to your progress.
 

·
Registered
Joined
·
678 Posts
Very impressive build Henner. Rack engines are much more complex and somewhat like clockwork. I was particularly impressed in the engines that Krauss Linz produced for Bosnian narrow gauge. Getting all of it inside those very narrow 76cm gauge frames is quite something. Just like in the case of your model. Congratulations.
 

·
Registered
Joined
·
170 Posts
In an early post, you said Swiss adhesion/rack engine. Does that mean this engine is capable of running on non-rack sections in between rack rail sections?
Ive been to Mt. Washington Cog RR and Pikes Peak Cog RR, and they both have racks installed on every inch of track.
I was wondering how the engine proceeded from non-rack rail onto the rack rail and get the gear in alignment with the rack?
 
1 - 20 of 53 Posts
Top