Unfortunately, I made a small error in the drawing and the bogie pedestal on the right (under the truck) is missing its rounded center piece. This time, I added it in styrene. The new version would be improved.
A 10x12 brake cylinder is positioned near the center. According to Charlie Pitts, a cylinder with an auxiliar reservoir would be more suitable. I will add this part also in the updated version.
Once the last improvements made, this underframe could be used for any version of 38' Ohio boxcars with arched roofs or railraod roofs.
|The small dots (circled red) are 3D printing residues|
Resin printing produces a ready assembled body made of complex forms.
If you make abstraction of the time spent to draw the 3D file - this can take entire days or weeks - the printed shell out of the shipping box is immediatly superdetailed. But it is not ready to paint or to roll.
The resin printing process leaves remnants like this small "dots" who may look sometimes as rivets, but in fact they are not. The shell needs some cleanup before painting. For this, you need a cutting knife, fine sandpaper and a fiber glass brush. The dots are easy to cut, you must only take care not to cut away details.
Quicker than expected i.materialise shipped the resin print of the Ohio Electric Freight Trailer. Here is the car directly out of the shipping box, disposed on Kadee trucks. The "kit" is split in two parts, the carbody and the underframe with bogie pedestals and a brake cylinder.
|The car parts|
|Left : With End doors. On the right : without|
|Evi M. made the quality check|
|CERA interurban box car|
This car is still known as the CERA trailer, named after the Central Electric Railway Association. Even standardized, this car was built in several variants. Here is the drawing of the two basic versions, with square ends or rounded ends.
Download pdf-file (scale 1:72)
|Ohio Electric Interurban Freight Trailer, H0 scale|
The "kit" will be composed of two parts, the body and a floor ready for Kadee trucks and home build radial couplers. Some basic underbody parts as the brake cylinder are modeled.
The parts marked fluo green in the second image must be added, same as brake wheel and handlers.
|3D drawings of resistor bank and brake cylinder scaled for H0 resin printing|
Also, the old traction model pioneers like Fritz Hardendorf were not always so exact when drawing underbody parts. Looking after your old Suydam models is not helping too : resistor banks of Sudam models are clearly oversized, as an example
So you need to search other sources. The Council of Tramway Museums of Australasia has probably the best technical online library http://www.cotma.net.au/library/ in the folder "Westinghouse" or "General Electric" you can find some rare pearls.