Yoke for 622

Once all six parts of each cylinder were soldered together, I really wondered if I would be able to add the yoke too. I wanted it soldered for strength, but feared turning the cylinder assemblies back into their constituent smithereens. I needn’t have worried. The hard part turned out to be holding the chassis in […]

Widening the Mary Street Bridge

I don’t know what I was thinking when I first mocked up the Mary Street Bridge at the south end of Pembroke. Perhaps I thought it was so lightly built that it could only have been one lane, and I do recall a reference to a foot bridge. At any rate, thanks to Facebook and […]

Cylinder assembly

Getting the first cylinder right could have been luck. By the time I’d completed the second one, I think I knew what I was doing. So here, for future Rene, are the fixtures I came up with to get the cylinders together straight, with a minimum of fuss!

Cylinder parts and jig

When I tested the dry fit of the first cylinder parts, I still needed to get the guides straight. Little did I realize at the time how difficult that would be. I was even more surprised by how difficult it would be to hold the guides straight for soldering. I shouldn’t have been surprised. Indeed, […]

Once more unto the breach: oil cups

Thanks to comments from Rob and Richard, I re-examined my approach to the crosshead guide oil cups. Rob encouraged me to look again at the prototype while Richard suggested I think like a jeweller. So, despite my earlier capitulation, I launched back into battle with the oil cups. It took a few attempts. One was […]

Capitulating to oil cups

I don’t believe I’ve ever had so much difficulty drilling holes. Five #80 drill bits lined up like casualties of war (where are their flags?), and not one successful hole achieved. #622 had oil cups mounted mid-way down the crosshead guides. They are quite prominent in the photos, and I would love to model them. […]

Cylinder dry fit

Fitting the the crosshead guides into the first cylinder took a morning’s filing. Perhaps it would have been quick work with a milling machine, but I didn’t find that the drawing as designed enabled me to assemble the parts the way I wanted anyway. There is still finishing to complete in the corners so the […]

Brakes Re-revisited (again)

I’ve lost track: this may be the fourth time I’ve designed 622’s brakes. But this time, I have real data to go upon, rather than just conjecture. In 2018, we discovered that the Prairie Dog Central’s #3 has the same pattern of brakes, and despite being out of storage and battery, I did manage to […]

HO steampunk bead

My first design for the cylinders made the end caps too thick. Six inches felt good at the time, but when I finally dropped a cylinder to the Assembly view in OnShape, I found the steam chest would overlap the end caps. Sadly, I saved that little virtual test until after I had finished the […]

Drawer organizer

I’ve been on a drawer organization binge since Christmas Eve. That’s when the bottom fell out of the tray in the kitchen junk drawer amid a cloud of unseasonal language. I emptied the whole drawer, evaluated and binned the true junk (including about 1/2 inch of tooth picks, which lined the bottom of the drawer) […]