12 Ton Coal waggon

thingiverse

This is a 1/32 scale "12 ton coal wagon" for G scale (45mm) garden railways. It's a remix of UTJTrain's open freight car 1:32 scale gauge 1, but since I work in 123D, I had to re-draw some parts. The body prints well if you use PLA, but attempts to print it in ABS have resulted in bad warping so far. Before assembling, make sure that all clearance holes are the correct size and drill them out if necessary for smooth movement. The wheels can be either Spoked or Solid, and they're set on 3mm stainless axles, 68mm long. You can use longer 76mm axles and fit directly to the side hubs, but then the "brakes" on the swinging arms will bind unless the swinging axles are fixed. The wheels are also the same size as those on LGB/PICO/Nuquida carriages so you can use their wheels if you prefer. I have a separate thingiverse entry for the wheel design, which includes an assembly/alignment tool, but I've included the wheels here. The swinging axle takes standard LGB couplings, and I've also designed some magnetic sprung versions that you can print. Use three 2mm long by 2mm diameter magnets in the loop, and one 2mm long by 3mm diameter magnet in the hook. Adjust their distance apart so that the "tension" is not too strong and check that the hook can displace downwards easily when coupling. Some filing of the slotted hole helps. The couplings use 13mm long #4 pan head screws, as do the swinging axle bosses. The buffer bar is screwed to the body and side axles with 10mm long 1.7mm pan head screws. The side hubs were supposed to be symmetric, but the end holes to fit the buffer beams are not quite the same at each end, so it's better to print all four rather than try to duplicate the ones that look the same. When fitting, look closely at the buffer beam and you should see which part fits where. You can also add some more 1.7mm screws to hold these hubs in place, but I found the tabs were sufficiently tight that extra screws were unnecessary. The photo shows two PLA printed wagons, with an early and much less successful ABS version in the background. Print Settings Printer: Shapeoko Rafts: No Supports: Yes Resolution: 0.2 layers, 0.4 nozzle Infill: 20% Notes: Use supports to make sure that the overhanging swinging axle coupling part is supported. Also, the side hubs have a small cut away and print better with supports. PLA seems essential for the body or else you will get warping. I used 123D to design this. Some parts translated to solids easily, but I found it easier to re-draw things like the swinging axles.