Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!
RC6 Locomotive for OS-Railway - fully 3D-printable railway system!
by Depronized, published
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Update! Arduino-code now added. It's a very simple code that uses an arduino Pro Micro board, an IR remote kit and a servo.
Link to IR-kit: https://www.banggood.com/Infrared-IR-Receiver-Module-Wireless-Remote-Control-Kit-For-Arduino-p-914005.html
Link to Arduino-board: https://www.sparkfun.com/products/12640
There are many similar boards so you might need to change board in the Arduino build environment. Check the code for outputs, the connections are very simple. The signal wire from the servo can be directly connected to the motor-pin on the arduino. Same for the IR-kit, no extra components needed. Only the LED's require resistors, value depending on your supply voltage and the chosen LED's. If you don't know what resistance to use, connect a potentiometer and a multimeter in series with the LED and adjust the potentiometer until you get around 10-20mA, which would be on the safe side for most Arduino board (check your boards maximum current on the I/O's!).
The electronics is powered by a 4-cell NiMh battery pack in the prototype, check the servo and your arduino board for maximum voltage if you want to use higher voltage, like 2 cells lipo.
Time for a new locomotive! This time the very common here in Sweden, the RC6. Used by SJ (short in Swedish for "government railways"). It is developed to be compatible with the OS-Railway project: http://www.thingiverse.com/thing:2146361
Few things still on the to-do-list:
- window frames for side windows
- cover for roof top box. My idea for this box is to have a hatch and buttons/switches underneath, if nothing else just the power switch. Right now I need to pull the roof of to connect the battery.
- installing the IR remote receiver in a good place, right now it's just loose.
- Trying to print a little bit smaller wheels, these big ones has a tendency to derail in the switches despite bogies, maybe it would also help to make them thinner, but there is some serious weight in this locomotive so too thin wheels would not cope if you just place it on the table and not on tracs.
- 2-axle drive. Right now only one axle is powered by the gears in the exact same way as the Z70 locomotive, with the exception that this one doesn't have room for a servo, it needs a 16mm motor with gearbox. This is due to the fact that this locmotive has bogies that both turn and tilt. Of course it's possible to engineer the drive mechanism differently, and I encourage anyone to do that if you desire a different type of drive! This was the quickest way for me to get it running. My idea right now to make it dual axle drive is to put 2 belt wheels and a rubber band between, much simpler than having more axles and bevel gears.
- Scale stuff under the "belly". There is supposed to be some tanks, boxes and stuff under the middle of the chassis, between the bogies.
- car coupler. This version do not yet have a car coupler.
This locomotive is really big, but not that hard to print. It is a fairly accurate replica of the RC6 locomotive and the size in O-scale meant that it's longer than the build plate of most FDM printers. This is why the chassis and body is divided into 3 parts.
The parts can be glued together using super glue (cyano acrylate). I prefer the gel-type as it's not as fluid as the regular one, it works really well. Melt glue works good but it hardens so quickly so it's really tough to glue these big parts together using that.
The bearing houses can be used with the same size ball bearings I've used for the cars and the Z70, 6mm OD, 3mm ID and 2,5mm thickness. However, in a test I did I found that PLA has very low friction so a set of PLA dummy bearings worked really well, so don't be set back if you don't have ball bearings, print the PLA bearings at least for a start.
This locomotive is developed to function with this railway even in curves and tilting angles, thus the bogies can both rotate and tilt. However, it really needs a low center of gravity as it has a tendency to fall of sharp curves if it goes too fast. An idea I have is to place an integrated battery compartment into the middle chassis part. This would lower the CG and make it more stable. But on a flat track it runs really smooth and well in the current version.
The main controller is an Arduino Micro Pro together with a standard Hitec servo circuit board extracted from an old servo, but used with a high-end DC-motor with gearbox. I will post a link here to a suitable motor soon, so check back for that!
The Arduino controlls headlights on both sides, red tail lights and extra lights, in total 6 light channels. It is controlled by an IR remote kit.
Link to the IR-remote kit: http://www.gearbest.com/transmitters-receivers-module/pp_227122.html?currency=SEK&vip=1041013&gclid=CNP7pK7TwNMCFUeZGwodTHcImQ
Arduino micro pro: https://www.aliexpress.com/store/product/Free-Shipping-New-Pro-Micro-for-arduino-ATmega32U4-5V-16MHz-Module-with-2-row-pin-header/318950_1348800135.html
As stated above, source code and schematics will be published soon.
Printing of the parts is pretty straight forward. The prototype in the pictures has been printed with PLA.
The only support-critical parts are the front and rear "cabins", which required both support from the build plate and part for the windows.
All the parts in the pictures were printed using the standard Prusa i3 mk2 and all color changes were done by changing filament, not by dual nozzles.
A resolution of 0,2mm is generally enogh in my view, but I leave that to your taste. The most critical parts are the power assembly for the roof which needs to be printed at 0,1 or smaller to turn out good enough. Don't use a brim here because it's very hard to get off the brim from such small components without damaging them. Also make sure your build plate is very clean for the power rig stuff. I clean my Prusas bed with acetone.
Depending on the settings of your printer, many parts will need a bit of work, like the holes which I needed to use a drill because the holes turned out too narrow. I don't want to change this in the CAD as you might have your printer better calibrated than mine. But if you think the screws are too hard to turn, use a drill to carve out a bit of the holes before assembling and it will work.
The bogies are assembled using M3 hex screws. I will add more details here soon, but if you want to get started printing do so and measure. Most times I try to leave room for long screws so it's possible to use whatever you have laying around instead of forcing you to buy screws in exact lengths.
M2x16 is what I've used as I purchased a bag full. I used countersunk M2x16 that I have cut off to suitable lengths where needed. This is far easier than ordering lots of different lengths so if you plan on ordering, order a bag full of this dimension and you'll have enough for the whole build. The only place where M3 is used is the bogies.
The locomotive in the picture has had no post-print processing other than removing support marks. No sanding, acetone smoothing or other process has been used. This also means that if you print with higher resolution and use a post-processing you can achieve far better surface quality than the prototype shown in the pictures.
glue the 3 body parts together, and the 3 chassis parts together but don't glue them all together after, it's good to mount the body onto the chassis using the screws so you have a way to do maintenance or changes later.
Most parts are straight forward to mount, most using M2 screws that I simply cut off in length if needed.
The roof top power assembly uses thin piano wire <0,8mm in the joints. You can probably fit legs from components such as LED's if you don't have piano wire.
The windows are easiest assembled by gluing the window frames onto a clear plastic and cutting around them. The windows can then be glued to the body using gel CA or other glue of your choice. I printed many versions of the frames in different scaling until I got a good fit, maybe you need a different scaling, if so, print the window frames from the ZIP-file and adjust the scale according to your needs. The window frame assembly file has a scale of 96%.
Don't hesitate to ask questions in the comments if something is unclear!
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RC6 Locomotive for OS-Railway - fully 3D-printable railway system! by Depronized is licensed under the Creative Commons - Attribution - Non-Commercial license.
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