The wonder of a local hobby store or It looks like Bachmann’s tender shell will work for 622

Today I stopped in to Central Hobbies to see if they had any of the parts I need for 622. It’s all esoteric stuff, and so I was happy to walk away with the gear box at least. It must be said that Central Hobbies is one of the better hobby stores I’ve ever encountered. […]

Tender sketch for 622

There’s not been much modelling going on for a couple of weeks as summer catches up with us. You know, warm evenings, barbeques, etc. The good life. I did, however, manage to scrape out an hour to roughly sketch the tender. I’m considering buying the tank from a Bachmann tender, but this sketch is scaled […]

622’s Fall plate will be removable

On #10, due to a lack of foresight, the fall plate was simply an extension of the cab floor. This was never satisfactory as it meant that it hovered slightly above the tender deck, rather than, well, falling on it. I also feel that it is vulnerable, hanging off the back of the engine as […]

Fake suspension for 622

Parts for 622 continue to appear on the drawing board. It’s easy to get carried away when you’re modelling in CAD. The keys that retain the springs, for example, are really miniscule – about .01 x .01 x .02. Will the 3D printer be able to resolve them? I hope so. I’m wondering if I should […]

Brakes for 622

As in modelling, drawing follows the 90-90 rule. The first 90% takes 90% of the time. The last 10% also takes 90% of the time. I’m in to the last 10% of this drawing. The trouble with brakes on steam engines is you have to remove them before you can remove the wheels. My previous […]

622: Backheads are harder to draft than make

It’s generally invisible except through the windows. So I don’t want to spend too much time on the cab interior and specifically the backhead. A modeller’s sketch is sufficient, I think. If I recall, the backhead for #10 took an enjoyable day of modelling. It was styrene plus a few pieces of lost wax jewelry representing […]

622’s pilot and the power of parametric CAD

I just finished drawing 622’s pilot. Actually, it is 623’s pilot as I don’t have any photograph showing 622 after she lost her link and pin. I think it’s a pretty good match to the photo. Perhaps the angle needs to be a little more acute. But here’s the thing: five minutes ago, it looked […]

Boiler fittings for 622

This week has seen me drawing the domes, stack and smokebox front for 622. These will all be 3D printed to start; depending on how they turn out, I will either use them as they are and fill them with lead, or cast them from Cerro-bend after cleaning up the castings. Again, OnShape amazed me […]

Drawing 622’s Stephenson gear

I just finished drawing up the valve gear for 622 in OnShape. This is certainly the most complex part I’ve drawn yet in the tool, and the idea is to have it 3D printed as a single piece. Sadly that means it won’t work, but in the interest of getting the locomotive running, I’m going […]

Crazy plan for 622’s crosshead guides

Compared to #10, the crosshead and guides on #622 are going to be a bit of a nightmare. First of all, they follow the raised pattern, which is going to make them difficult to locate vertically. Secondly, they are not plain bars, but are shaped to provide strength where the thrust from the connecting rod is […]