Re: 1:8 H Couplers
Now that's just awesome!toggle quoted messageShow quoted text
It's been a very long time since I was involved with miniature rail (7 1/4" gauge but most stuff was 1:6 or 1:4.8" scale) and I don't know a lot about the inner workings of the couplers we used but a couple of things you could consider.
The knuckle couplers we used had what amounts to a bolt with a loop welded to the top which functioned as the lock and lift pin (top operated obviously). They also had a coil spring in them somehow that threw the knuckle open a bit when you lifted the lock enough to clear the knuckle "tang" (for want of a better word).
I'd look at the possibility of modifying the coupler drawing so that knuckle pivot hole goes all the way through so you can use a bolt like on the commercial couplers; it may be stronger than the short stubs on the Sergent design.
I'd definitely look at getting them cast in metal. You should easily be able to use the prints as the pattern for doing that, though you will have to take into account shrinkage etc.
On 29/07/2020 17:57, Nathan Rich wrote:
Thought you guys might enjoy this, I upscaled the H coupler to 1:8 scale, for 7 1/2" gauge. I wanted to test the theory, because I wanted to use a correct H coupler on the front of a PA locomotive a friend is building.