updated 24 October 2008
We are currently building a brand new locomotive for a customer of a GWR 14XX 0-4-2- tank .As there are no details or castings for this design in 10 1/4" gauge we are producing our own including patterns. This loco is being built to a scale of 2 1/2" to the foot rather than 2 1/4" as the customer has other locomotives which he wants it to match the overall size. To date frame and wheel drawings have been produced including the production of wheel patterns .Castings have been made in cast iron and have since been machined.
Here we see the finished wood patterns prior to delivery to the iron foundry for castings. The patterns are build up from several sections of wood to provide strength and durability .The could is the special pattern varnish which protects the pattern from the abrasive sand during the molding process.
A driving wheel on its last machining operation being held in a 12" 4 jaw chuck and a finish speed of of around 80 rpm which produces a supper finish without chatter. The next operation is to cut key ways in the bore then bore the crankpin holes. All the wheels including the trailing wheels have now been machined. More pictures will follow and the loco progresses.
A recent batch of patterns made at our works for the 14xx ready to be sent to the foundry .The patterns are all made from Bass wood and consist of up to 15 pieces of wood from strength . The patterns are made to allow for shrinkage in the finished casting and also for machining.
Here we have the new boiler for the 14XX locomotive. the boiler was designed and constructed by Gerry Dowd ,of the Gloucester steam and traction company and comes with full CE approval .This boiler design is exclusive to Joe Nemeth Eng ltd ,so if you require a Belpaire firebox type boiler for a large narrow gauge loco in 7 1/4" gauge or a 10 1/4" 14XX or perhaps a M R 3 F then please enquire. Castings are now available for this loco should you wish to build one.
The crank axle has been fabricated ,pressed together and pinned for extra security ,and here we see the crank undergoing final machining to the journals.
One of the driving wheels showing the boring operation for the crankpin. Shown on the wheel is the jig which is used to locate on the axle bore key way to allow for clocking the position of the crank pin.
Here is the leading coupled wheel set completed and quartered
Here we see the finished driving crank axle up between centers for checking the accuracy of the crank after pressing the wheels on. I am happy to say the run out is within .005".
Finished split axle boxes in there horn blocks ready for fixing into mainframes.
Bob Symes ,with his 14XX chassis so far on his Green Dene railway for clearance testing.
The cylinder blocks, covers, valve and valve buckles covers and glands nearing completion. The bores have been honed to a fine tolerance and finish.
Recent work on the cylinder assemblies included finishing stuffing box glands, and making cylinder drain cocks.
This view shows slide bar sets and motion bracket finished. The crosshead bronze slippers are also fitted.
Another view showing the neat drain cocks and glands.
MORE UPDATES TO FOLLOW SOON