The O Scale Resource

September October 2020

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The O Scale Resource September/October 2020 41 By Glenn Guerra For a long time one of my desires has been to scratch build a steam locomotive model. When I was doing the Mullet River kits, I was doing a lot of brass forming and soldering. Once I started to learn more about soldering and brass work, it became fun and really opened up new possibilities for me. I designed some brass locomotive kits and assembled them learning even more, so I thought it was time to try scratch building my steam locomotive. If that were not enough, I decided to do two similar models at the same time. The work was started a few years ago with cutting the frames. The project lay dormant while I had to do other things and I was missing some machines I would need. I have a lathe and have been using it for years and am getting more comfortable with the lathe, but I needed a milling machine. A few years ago, I acquired a Sherline milling machine and have been learning how to use it. There is a separate article on the milling machine in this issue. Now that I had the milling machine and some time, I decided this was the year I would build my models, and I started in earnest in May of this year. While I have been working, I have been taking photos and Dan asked if I would do a series of articles, so here we go. As Dan and I were talking about the articles, I was telling him about the two different prototype locomotives I was modeling. He suggested that my first article should be, where do you start? There are a lot of things to do before you make the first piece of your model. Where do you get prototype information? Then how do you translate the prototype dimensions into some model dimensions and a design? Let's start with the prototype information. Scratch Building Steam Locomotives Pt. 1 Where to Start This is one of the locomotives I want to model. It's a one of a kind and class A-4. It was made in 1884 along with class A-3 locomotives. The difference is the #274 has 1" larger cylinders, a slightly bigger boiler and larger drivers. Some of the class A-3 locomotives where made in the Chicago shops where this photo was taken. I am working on the assumption that what happened was they took one of the class A-3 engines and modified it, more on that later.

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