DHG 700 in Gauge 1 (1/32) for Märklin Chassis
Description
Updates: --------- 2020-11-06: Video added 2019-03-28 Added Decals for locomotive 31994; https://www.rangierdiesel.de/index.php?nav=1403959&lang=1&id=31160&action=portrait 2018-12-19: Minor corrections on Chassis_A and Chassis_C. <iframe width="560" height="315" src="https://www.youtube.com/embed/Jy7W3wfXNWo" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> Overview: --------- The DHG 700C was produced by HENSCHEL in Germany from 1973. In total 55 locomotives were built and mostly used by industrial railways in Europe. The model is designed to fit the Märklin 5720 (DHG 500) chassis. The Märklin 5720 was offered from 1969 until 1981. So, the distance between the axles and the position of the brake cylinders is not prototypically. But the chassis from used Märklin 5720 locomotives is widely available and cheap. The chassis from the 5719 (1982-1986) does not fit. This version drives the axles with coupling rods. The body is separated in seven parts which should be glued together. The single parts are small enough to be printed on most home FDM printers. The total view of the body is for illustration only. It does not always show the latest version. I would not try to print it. To see possible liveries, visit <https://www.rangierdiesel.de/index.php?nav=1401813&lang=1> . For more information about the prototype see German Wikipedia: <https://de.wikipedia.org/wiki/Henschel_DHG_700_C> How to print: ------------- The model is large. Nothing to make on a rainy Sunday afternoon. Printing in 0.1mm layers and with 50mm/s speed all parts together need about 100 hours of printing time. The parts of the model shown are printed in usual PLA. Only the lights are printed in transparent material. I used transparent window-color to finish the red lights. If you live in a warmer country or want to use the locomotive outdoors in the summer, it would be a good idea to print the model in PETG, ABS or another heat-resistant filament. ### Chassis: #### Front and rear Chassis (Chassis A and Chassis_C): I got best results printing the parts upside down and with support to build plate only. The support generated with “support everywhere” is very difficult to remove at these parts, especially behind the shock-absorbers. #### Middle *Chassis:* (Chassis B) This part is best printed vertically with the ladders at the lower end. #### Buffers: The locomotive can be built with the original buffers from the 5720 or printed buffers. A round and a rectangular version are included. ### Body: #### Body A: I got better results printing it with support to build-plate only. It is very difficult to get the support out of the small vents at the top. #### Body *B:* This must be printed with support everywhere. It is advantageous to have a picture of the part at hand while removing the support. To remove the support from the windows it can be useful to drill some holes in the support first. ### Finishing: ### Colors*:* I used signal grey RAL 7004 and pure orange RAL 2004. The strip is sun yellow RAL 1037. #### Mounting the body to the chassis: Put the body on the chassis and mark the position of the original screw-holes. Drill small holes in the plastic and use self-tapping-screws. ### Windows: Windows are not included. I don’t know a way to print really transparent windows with a FDM printer. I suggest cutting windows from a transparent material. I enclosed a drawing of the windows in the files. ### Head lamps Due to the heat – sensibility of PLA I would remove the conventional light-bulbs at least in digital operation. I suggest gluing LEDs to the printed lamp-inserts. In this case the lamp inserts should be mounted with some aluminum foil around the transparent parts. Otherwise the whole body will glow when the lights are on.
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