Although I haven’t posted an update since before Christmas, I have been doing a bit here and there. Mostly this has been making the additional bits and pieces needed for the inside motion. The motion for the J6 differs from other versions of Stephenson’s motion in that it has four valves rather than the more usual two. There are two between the cylinders and two above them. Although I have the full LG Stephenson’s motion set, in the end I doubt that I will be able to use much more than the connecting rods, eccentric rods and the slide bars and cross heads. The other bits will go in the spares box for a future build.
The arms that fit to the lower linkages still need to be shortened to 5.5mm between hole centres.
The expansion links in the motion kit are a couple of millimetres longer than the GA and have a lug on one side which I would have to cut off for this particular application.
As I am making all the other parts to match the dimensions on the GA, I opted to make a pair of expansion links to match. Working on the theory that I always have the LG castings as a fall back, if my home brewed ones don’t fit for any reason.