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e424 del prado
It's time for The Littorna locomotive, that is an historical loco for wich i had to make some unique changes in order to place an electric engine inside. its slim, long design with weels partially covered by the body makes the motorization a little bit tricky.
Once take the body out and take measurements i have realized that there are not motorized chassis for sale that can easly fit inside. Considering all Tomytec motorized chassis available,the TM-20 is the one that fits better inside the body, unfortunatly, this model, is too short:
To solve the problem, the 1st thing i thogh, and probably the most obvious was to cut it in 2 parts :-)
This solution create two more problems: thetraction change from 8 to 4 driving weels and a traction rubber became useless
those problems can be solved in more than one way: you can find/build a longer transmission pivot or leave only 4 WD and switch the wheels placeing both rubbered weels in the the same side of the remaining trasmission pivot.
At this point, with the chassis cutted in 2 parts i had to found a way to build a structure that cover the hole and that is capable of host some weigh. For this reason i have been inspired by my olds works to create a support with weightank
In order to make the loco heavier i also used the top part adding some lead. As you can see from the image below i had to take out the small transparent strip of the fake glass in order to allow the electric motor to fit properly
Let's now talk about the body: the other problem to solve is to find a way to allow weels to turn (N scale minimum radiu is approximately 19mm).
to make it posible i've used my new laser engraver. After making the cut shape with a CAD software i have started to experiment some laser cuts on a spare plastic body
After few attempts i have found the best realtion between power and burning time in order to create a groove deep enough to use it for the final cut using a sharp cutter (i couldn't entirely cut the parts away because of the thickness and low laser power)
One last problem i have found consist in the small weighs that don't fit in the loco body, the solution is quite easy: i just had to trim them of a couple of mm. Unfortunatly h forgot to take a photo so i used a new chassis and i have highlighted, in red the parts to trim (1mm deep both sides)
At this point only left one last thing to do: add white lighs on both sides (2 small white leds and a small 1000 Ohm smd resistor) ad fianlly assemble all.er lato e una piccola resistenza da 1000 Ohm e assemblare il tutto
As usual a short video of the locomotive
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