Thanks to Don Ball for replying to my previous post regarding brakes. He came up with a page from the 1906 Locomotive Builder’s Dictionary, and a Model Railroader article by Gordon Odegard that completely reformed my belief about how these brakes probably worked. Rather than that tiny vertical equalizing lever, it is likely that they had a horizontal equalizing lever beneath the ash pan. So, … Continue reading 622 brakes revisited (again)
“I do all my best work in bed,” famously and salaciously declared Mae West. And so it was, I awoke the other night with the solution to a problem I’d given up on long ago – the drawbar. Confusingly, the drawbar of a locomotive is not the thing that pulls the train; I think that’s called a coupler, but the book that would confirm it … Continue reading Drawbar dreams
The basement shows no sign of being finished, and so, I am continuing to refine the plans for 622. One of the challenges will be maintaining the relationship between the two frame halves while the insulating epoxy layer sets. I had been thinking I would add sacrificial tabs at the ends of the frame, and hold them the correct distance apart with a spacer. The … Continue reading Loco frame jig
It appears that the brakes are another part that has now been redesigned. I’ve simplified them somewhat from the first version. To tell the truth, I’m hoping that someone can point me to a resource that shows how this pattern of brakes worked. It seems they were favoured by Baldwin for a short period in the early nineties. Prior to that, the brake cylinder was … Continue reading Brakes in the darkness
…or at least an hour anyway. As I was working my way through design of the running gear for 622, the reach rod for the reverser proved to be an interesting conundrum. According to the drawing from Baldwin, the lever for lifting the valve gear is supposed to be 21 inches long. This, along with the length of the Johnson bar, would determine the amount … Continue reading 3D CAD saves the day
The valve gear for #622 will be printed as a single part. As with most of the parts, the original drawing needed to be redone. The first time around, I thought I was very clever by using a minimum of sketches. I chose parts of the sketches to extrude to different depths, but hard-coded the extrusions. This time I think I’m even more cunning: rather … Continue reading Valve gear – a complex OnShape part
As we don’t want another flood, the Boy and I spent more than an hour getting at the offending floor drain today. Naturally, it is under a stud (supporting an electrical outlet), and so, it wasn’t a simple matter to get at it. The hole is simply straight through the concrete, 3 1/2 inches in diameter. Rona and Home Depot were no help whatsoever in … Continue reading Flood update: but of course it’s under a stud!