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Post by rednorte on Dec 26, 2012 11:46:22 GMT -5
The project of a meter gauge EMD GR12 of the Ferrocarriles del Estado de Chile has been on the back burner for quite some time now. But finally I have returned to the workbench and done some serious work on it... Actually this project has been started some two years ago, when a friend of mine, together with another modeler, started design work on an EMD G16 of the former Yugoslavian state railroads. While I wasn't too much interested in a G16, I had soon started thinking about modifying such a G16 into a similar, but smaller Chilean GR12. Well, the G16 project was abandoned later, but we decided to design a proper GR12. The body parts have been designed in 3-D CAD by my friend. While he was doing the hard work, it was my duty to provide detail information on the prototype and to point out design errors on the CAD drawings. One exemple of the CAD-work: The first locomotive body has then been printed on a 3-D plotter and used as a master to cast subsequent bodies in resin. To make it short, the learning curve has been very steep, the process very frustrating at times, the costs higher than expected, but in the end we had a couple of usable GR12 bodies. I have built up the GR12 shown in the photographs, using a H0n3-mechanism from Hollywood Foundry, fabricated styrene and wire parts, homegrown truck frames, some nickel-silver custom etchings and detail parts from a variety of sources - the usual suspects, from Atlas to Cannon and Co and to Plano Products. It is equipped with a Micro Tsunami from Soundtraxx (the standard TSU doesn't fit under the narrow hood) and after some hours of tinkering with the CVs and working out a way to get rid of the heat of the decoder, my first GR12 is running and sounding the way I had been hoping it would some day. So far for now, next stop will be the paint shop! Some more pics will follow in a second post. I hope you like this one! Beat
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Post by rednorte on Dec 26, 2012 11:54:38 GMT -5
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soda
Probationary Member
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Post by soda on Dec 26, 2012 13:10:16 GMT -5
I like it! Nice!
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sgoti
Chairman
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Post by sgoti on Dec 26, 2012 14:31:43 GMT -5
Lookin' good so far!
Who makes the dynamic fan grill that you used?
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dekon
Staff Member
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Post by dekon on Dec 26, 2012 16:35:39 GMT -5
Real nice build. I was going to ask the same question on the fan.
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Post by CP_8530 on Dec 26, 2012 18:46:29 GMT -5
Impressive!
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Post by antlorch on Dec 26, 2012 19:16:11 GMT -5
That thing is pretty cool looking for being so strange looking. Your details are nice and make that thing look very unique.
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Deleted
Deleted Member
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Post by Deleted on Dec 26, 2012 21:42:26 GMT -5
Yes, a very unique and interesting build. I would definitley like to see som ephotos after you get it painted.
BTW, I will ask as well. Who makes that DB fan grill? That is a VERY important find you have there. You model is the ONLY one I have seen that on and correctly shaped. If it is indeed, a 48" fan, please tell us more abou tit.
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Post by rednorte on Dec 27, 2012 9:14:39 GMT -5
The screen on the dynamic brake fan is a custom-etched part specifically made for the GR12, it is 44''.
Beat
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Post by antlorch on Dec 27, 2012 9:17:48 GMT -5
Did you have this screen etched yourself and is it available for others to get?
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Post by tjmfishing on Dec 27, 2012 20:53:25 GMT -5
Looks very similar to one of the models CN used on the narrow gauge lines in Newfoundland up until 1988. I believe all of the ones which were not scrapped were sent south to Mexico or South America.
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Deleted
Deleted Member
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Post by Deleted on Dec 28, 2012 0:37:15 GMT -5
I can definitely see that the DB fan grill is domed. Naturally it was etched flat and then you domed it.
I can't really tell, but are the circular grill wires spiraling or are they concentric?
Anthony, the grills we would need have to be spiraling. Not a difficult part to design though. This would be the type of grill used late phase SD9's and the SD24's. You could use a Cannon fan base and then plop the grill ontop of it. The height of the grill is the same as the height of a standard 48" fan ring. Instead of the ring though, the grill tapers from what would be the top of the fan ring down to the fan base.
Sorry, did not mean to get off topic here.
Do you have any pictures of the prototype you can put a link here. It would be cool to see what the paint scheme you are going to be using.
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Post by rednorte on Dec 28, 2012 1:13:32 GMT -5
We had a few of these covers custom etched from nickel silver. They are etched flat and then pressed into the conical shape you see on the model. Right now we don't have any spare etchings at all, and we are not set up to do any series production. But then, there seems to be some interest in the GR12 around here. While the master and the casting moulds have been destroyed during the casting of the locomotive bodies (the steep learning curve, you remember...), we still have the CAD files of course. And while we had experienced far more problems with the 3-D printing (rapid prototyping) process than we expected, this technology is progressing at a fast pace. So there is a fair possibility that we will do more GR12 bodies at some time in the future. And of course this will be the time we will need to do more etchings - maybe some more than just to fulfill our own needs. Btw the rings on the cover are really concentric, not spiraling. Beat
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sgoti
Chairman
Posts: 459
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Post by sgoti on Dec 28, 2012 2:09:06 GMT -5
Looks very similar to one of the models CN used on the narrow gauge lines in Newfoundland up until 1988. I believe all of the ones which were not scrapped were sent south to Mexico or South America. I think one (G8?) survives stuffed and mounted in Colorado: maps.google.com/maps?q=39.908539,-105.240516&ll=39.908479,-105.240488&spn=0.000421,0.000573&num=1&t=h&z=21
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Post by antlorch on Dec 28, 2012 9:16:53 GMT -5
I have seen some engines with this type of fan on them here lately. I saw a GP40 with this on the dynamic brake hatch and recently I saw a NS 40-2 with one of these as a radiator fan. Neat looking cause it was different..
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Post by cartelcaipira on Dec 29, 2012 6:41:45 GMT -5
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Post by cartelcaipira on Dec 29, 2012 7:01:39 GMT -5
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Post by rednorte on Dec 29, 2012 7:29:39 GMT -5
The photobucket link in Cartelcaipira's reply is pointing to a drawing of a Brasilian version of an EMD G12. This is a 4-axle locomotive. The GR12 is actually very similar, but riding on C-C trucks. At the time the GR12 was released, the "R" designation was indicating a special 6-axle "heavy duty" version of EMD's export model roadswitchers. The locomotive that is standing in an industrial area not far from Denver, CO is an EMD G8. Again a very similar locomotive, but equipped with an 8-cylinder version of EMD's 567 diesel as opposed to the 12-cylinder diesel in the G12 and GR12 locomotives. Canadian National had a couple of G8 locomotives. Some were 4-axle standard gauge ones and some were narrow gauge (cape gauge) for use on the Newfoundland narrow gauge lines. The narrow gauge ones were riding on A1A-trucks. I do not know if the loco standing in Colorado came from Canada.
Beat
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Post by cartelcaipira on Dec 29, 2012 7:56:57 GMT -5
The photobucket link in Cartelcaipira's reply is pointing to a drawing of a Brasilian version of an EMD G12. This is a 4-axle locomotive. The GR12 is actually very similar, but riding on C-C trucks. At the time the GR12 was released, the "R" designation was indicating a special 6-axle "heavy duty" version of EMD's export model roadswitchers. The locomotive that is standing in an industrial area not far from Denver, CO is an EMD G8. Again a very similar locomotive, but equipped with an 8-cylinder version of EMD's 567 diesel as opposed to the 12-cylinder diesel in the G12 and GR12 locomotives. Canadian National had a couple of G8 locomotives. Some were 4-axle standard gauge ones and some were narrow gauge (cape gauge) for use on the Newfoundland narrow gauge lines. The narrow gauge ones were riding on A1A-trucks. I do not know if the loco standing in Colorado came from Canada. Beat yes I know, we had around 100 G12 G8 with and without dynamic brakes on broad gauge and narrow had also a truck 1-A-1
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Post by CP_8530 on Dec 31, 2012 2:10:27 GMT -5
Looks very similar to one of the models CN used on the narrow gauge lines in Newfoundland up until 1988. I believe all of the ones which were not scrapped were sent south to Mexico or South America. Nah, those were the NF110/NF210's that were mostly exported. Of CN's fleet of G8's, most were scrapped IIRC. with one to the Canadian Ry Museum in Delson QC, two on display in Newfoundland (802 & 803, although I recall one was later scrapped) and one standard-gauge unit became a Cargill grain elevator switcher in the US (no idea if it's still there): www.flickr.com/photos/8226029@N06/3283646848/
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