Getting Jiggy with Eccentric Sheaves

A post on a few forums by Nick Dunhill on his build of a Rhymney Railway R class on preparing the eccentric sheaves couldn’t have been timelier.

I am just at that point so the night before last I made up a similar jig from a couple of bits of wood that I had on the bench and having consulted the GA for the length of the sheave I marked up and drilled a hole for the pin (a 0.8mm drill bit). Finally, I filed and soldered up the first sheave. Last night I managed a couple more.

Gladiator J6 Eccentric Sheaves Sizing Jig
Inside Motion Eccentric Sheaves – for Gladiator J6
Inside Motion Eccentric Sheaves – for Gladiator J6

GCR Class 5A A lot less progress than I had hoped…

I am not sure where last weekend went as I had hoped to achieve a bit more on this build but sometimes that’s the way it goes.

First off I cut out the Diane Carney number plates with a no 6 blade in my piercing saw and filed them to final size. Not knowing for certain whether the actual plates had a rim around the beading or whether the beading was in fact the edge of the plate I left two of them with a rim and asked Brian which he preferred.

Then I soldered the boiler to the formers and fitted it to the body. The bottom edge of the boiler section that fits between the tanks has three tabs either side which fit into corresponding slots on a fold out on the inner tank sides. What a fiddle it was to get all six in the slots together. I hadn’t slept well on Saturday night and in the end, I had a snooze before my brain was clear enough to get them all in place.

GCR Class 5A Boiler
GCR Class 5A Boiler
GCR Class 5A Boiler

[img]https://live.staticflickr.com/65535/50825369877_89a3a43791_b.jpg[/img]

Gladiator J6 Home Brewed Inside Motion Parts

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.

Gladiator J6 Scratch Built Inside Motion Parts

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.

Gladiator J6 Inside Motion Parts
Gladiator J6 Inside Motion Parts

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.

Gladiator J6 Scratch Built Inside Motion Parts
Gladiator J6 Scratch Built Inside Motion Parts