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!
To be honest, I don’t know if I would have this much patience if the real workshop were not still out of commission. The sheet metal design for the crosshead guides and crossheads took several days (well hours, as I don’t spend whole days on this stuff!) due to a disagreement between OnShape and me about how some sheet metal models should work. We’ve finally … Continue reading Redesigned crossheads refine OnShape technique
A couple of weeks ago, The Boy and I were lucky to be invited to visit Dan Gelbart’s amazing lab. The Boy was so inspired, we’ve been working our way through Dan’s YouTube channel. There, Dan stresses the benefits of keyholes to facilitate removal of parts. As he says, they’re free with a water jet cutter, and they really help to keep from losing screws inside … Continue reading Improved cab design
When I built #10, one of the innovative and useful ideas was to create both running boards out of a single large piece of brass. This helped me get the boiler level relative to the running boards, and since Pembroke is not an incline railway, a level boiler is desirable. I’ve planned the same approach with the virtual model of #622. Interestingly, using the Finish … Continue reading Sheet metal construction fixtures