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Spirit Track - La remotorisation de ma Planet 2 (31)

12 Avril 2013 , Rédigé par Link92 Publié dans #Spirit-Track, #Construction, #Maxitrak, #Planet 2, #Site web, #Création du réseau

Après de très nombreuses recherches, j'ai enfin commandé les pièces nécessaires à la remotorisation de ma Planet 2.

Il va falloir modifier pas mal de choses car la conception du chassis est assez light...

Je vais donc commencer par retirer les 4 moteurs 12V de 80W ainsi que les 2 roues dentées. Je vais revoir le système de suspension et de transmission de l'effort de traction en ajoutant une traverse de charge. Elle sera fixée a chaque extrémité par soudure sur la traverse d'attelage mais également sur le chassis actuel ce qui permettra la transmission d'un effort beaucoup plus important.

Pour la chaine de traction (issue du monde des quads électriques), je vais utiliser 2 moteurs 36V de 800W reliés chacun à un essieu au moyen d'une transmission par pignon, chaine T8F de 9mm et couronne (à souder sur l'arbre des essieux) rapport 11:25 (ou 14:25 si je dois changer le pignon d'origine du moteur). Comme la réduction sera assez faible (0.56 soit, dans mon cas, une Vmax de 30km/h), je vais alimenter le moteur en 24V (pour limiter la vitesse à env. 18km/h) avec limitation du courant max à 30A (pour éviter de le griller) sachant que la réduction de puissance qui en découlera n'aura que peu d'impact (env. 2*500W dispos.).

Pour finir je passe sur un contrôleur programmable et je remplace la carte des auxiliaires (sifflet et fanal). Je vais également revoir tout le câblage et positionner les 2 batteries dans le wagon.

Par contre, il faudra surement lester la loco sauf si je trouve une solution pour y laisser une batterie (bon c'est pas gagné, les nouveaux moteurs sont beaucoup plus larges...).

Dans un 2ème temps, j'ajouterai un pignon centré sur chaque axe d'essieu afin de la rendre compatible avec la crémaillère et de mener une campagne d'essais. En effet, cette partie là se précise fortement suite à un échange téléphonique avec les Ateliers du Grand Morin.

Je vous donne le détail du matériel commandé :

* 2 moteurs 36V 800W 2750tr/mn MY1020.

* 2 kits vitesse pignon-couronne 14:25

* 2 chaines 9mm T8F

* 1 controleur 4QD pro 150

* 1 carte auxiliaires 3 relais 4QD.

Dès que je peux, je vous fais des photos de la modif. En attendant, je vous mets les liens directs du matériel.

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Ron 11/05/2013 09:31

Excusez-moi d'utiliser un traducteur que mon français n'est pas assez bon, je suis d'origine anglaise:
Avez-vous vu PETROLSCOOTER pour les moteurs et la chaîne.
Ken Swan utilisé un rack pour sa vapeur design "Kopple" en ingénierie en miniature sur 1987. De mémoire, il utilise 30 cm sections de crémaillère longues aluminium mais en raison de la longueur ne cherche pas à les plier. Le rack est l'anglais 4 DP.
Excuse me for using a translator as my French is not good enough I am of English origin:
Have you seen PETROLSCOOTER for motors and chain.
Ken Swan used a rack for his steam design “Kopple” in Engineering in Miniature about 1987. From memory it uses 30 cm long aluminium rack sections but due to length does not attempt to bend them. The rack is English 4 DP.

http://beamishcograilway-samsuedave.blogspot.fr/p/locos-on-bcr.html
http://bmeg.co.uk/html/2002.html
http://modelengineeringwebsite.com/Koppel_loco.html
http://www.prestonservices.co.uk/miniatures.html chercher Kopple. look for Kopple.
Salutations
Ron

Link92 13/05/2013 21:22

Dear Ron, many thanks for your advises.
In fact, I've choose to add a rack because I've no other solution (except a cable car) if I want to add track. So i've choose the most economical and easiest solution but it seems that my rack is the metric conversion of the 4DP (so not equal but nearby). And it's still for this reason that I've choose the alum rack (the load is weak on the rack because a part is supported by the adhesion wheels). Note at this time it's just a test and If needed I would change for stainless rack.
For the geometry and due to the fact it's an indutrial rack (very high precision rack, micrometer tolerance), i'am not sure that bending operation will not affect the rack & pinion contact but I'll test it. I also need to create an entry/exit "spinged" rack and test it.
In all case the rack and pinions will be lubricated but I'll take a look to your miracle product ;)
I know my choices will isolated me on my track but it's the easiest way for me. And of course all my trains can ride on standard track.
I've visited the Petrolscooter and they have a lot of choice. I'll think about it for my future projects (Z800).
I've been very surprised to see a Koppel for sale. It's my grail lol but actualy out of my budget.
Many thanks again.

Regards.
Jean-Michel.

Ron 12/05/2013 11:12

Hi Jean-Michel,
A pity that you have not adopted the standard 4 DP as then you could both go visiting and accept visitors. I think that at one time aluminium alloy cast rack sections were being sold I think about a foot long each. If you have money then may be a plastic rack could be made but a steam locomotive might do it much good.
I do my own casting so for me I could possibly cast my own. I am not very keen on using aluminium alloy as a bearing or sliding material as it has a 1,3 coefficient of sliding friction. However you might try Rocol Antiscuffing spray http://docs-europe.electrocomponents.com/webdocs/0037/0900766b80037103.pdf. This is a horrid almost black covering that dissolves with conventional cleaners. Hence cleaning has to be done with either a cleaner that does not take this substance off or you repeat application. It is oil and grease resistant. It is supposed to be able to take huge compression forces and stops metal from “galling” or scuffing meaning tearing the surface up. I used this for space and military and it works well plus NASA approved status. It is meant for gear teeth and might save your aluminium rail if you spray the rail edges but not the rail head. Note that the Festiniog/WHR use graphite sticks on their wheel flanges that might save your rail by almost unseen lubrication.
The geometry of curving a rack does change but I bet that the size of change is very much less than the manufacturing tolerance in other words geometric and linear measure mean nothing against tolerance and especially when temperatures change. With railways there is an awful amount of “crunch” meaning crude but effective. I spent a third of my life hearing wheel squeal because of “geometrical” errors but then that was what trains were all about. If geometry was important then the rack has to be temperature stabilized, the tooth face to rack must always be radial (track curve radius) and if it is horizontally radial then one part of the tooth is not rolling but rubbing hence geometrically wrong and of course no grit anywhere.
In Switzerland the lead in is a sprung section of rack that pivots down. The wheel engages with a “crunch”. There is no synchromesh. The dog clutch is engaged and away the train goes.
After my professional experiences of air and space craft, trains and trams are a big relief.
A pity about standards. I bet Beamish would love a Swiss rack railcar set as a visitor.
Petrolscooter did very well delivering to me in France. I think the shipping was £21 but I ordered several motors on a Monday afternoon. They were here in Fremecourt 95830 before midday the following Thursday and the packet was heavy!
I hope the above helps.

Ron

Link92 11/05/2013 22:48

Many thanks, Ron, for your post and don't worry I speak english ;)
I have seen the Koppel rack steam locmotive running on the Beamish Cog Railway and it's wonderfull.
I've thinking order the entire collection of Engineering in Miniature where all plans are avaible but it seems to be too much difficult for me now. Maybe later lol.
There's only 2 or 3 models of this rack locomotive and some others locomotives running on rack (steam, electric or gazoline) but nor realy a standard for the rack conception.
So I've decided to use a industry standard rack with minor modifications for my rack railway.
But you'r right, the bending of the rack is complicated because it change the geometry of the rack and interweaving of the pinion in the rack. I will avoid to use rack in curve or use very big radius.
I will take a look on your links (someone known).
Regards.
Jean-Michel