Flying Scotsman
Having machined the crosshead blanks it was then on to the more involved parts of the design. First I clocked one of the crossheads upright in the machine vice, as the two types are the same width, they could all be quickly machined from this register. After first drilling/reaming
Flying Scotsman
I'll begin by showing the drawings, the 'valve' (bobbin) will be redesigned, I haven't drawn this up yet, that will be the last item on this current list. Something to note here is that both the glands and the cross-heads vary in spec.
Flying Scotsman
Once I had finished the bushes for the outside links I then moved on to the 6 pins, one of which is slightly longer for the 1:1 lever fulcrum. It may be that I'll need to shorten the pins for the cross heads but as those are
Flying Scotsman
Continuing with the valve connecting links I next machined the small collar around the holes. I have modified these a little to give more metal to the slot tabs, basically I haven't machined as close to the hole as seen on the full size and also allowed a
Flying Scotsman
Valve connecting links These are another one of those parts which require a number of setups and a little thought in machining them, this is how I have tackled them. First job was to cut up 3 lengths of 5/8 x 3/8 gauge plate, 1 longer than the
Flying Scotsman
Onto the final machining operations for the 2:1 lever, I'll make the bronze bearings in one batch once I have made the 1:1 lever and the 3 connecting links as except for the fulcrum pin they all share the same bearing specs. Before moving on to
Flying Scotsman
With the mill repaired (the inverter/speed controller was the guilty party) I could return to the lever. At the time of failure I was in the middle of machining the long section down to 3/8 wide, this is the widest part of the taper. A few things to
Flying Scotsman
I'm now returning to the motion and I'm going to start with the 2:1 gear for connecting the valve events for the middle cylinder, before doing so I need to finish the gear stay which involves turning up the fulcrum bearings and their pin. I
Flying Scotsman
This will be short entry just to show that the brakes now refitted to the chassis and tested. First picture is a general side view to show the brakes once more fitted to the chassis, as you can see the model is being held aloft by it's lifting
Flying Scotsman
The brake shaft pull rods, adjusters and leading pull rods are the last parts required to complete the brake gear. I haven't taken pictures during their manufacturer as they are very similar to the other pull rods, the exception being the adjuster. This begins life as Hex BMS,
Flying Scotsman
On to the pull rods, I began with the 'U' shaped ends which slide over the beams and are then secured with the remaining pins. These are the same width and thickness as the links shown in the last entry but these are doubled over and thus why
Flying Scotsman
I decided that it would be wise to test fit the hangers along with their cross beams before moving on to the pull rods. You can see the brakes hanging in the 'off' position, No drama here but as expected I will need to re-shape the steam