A New Smokebox Door Seal For 6A
Re-Wheeling An NG/G16
NG/G16 129 Engine Unit Frames Near Completion
Another New Boiler For Puffing Billy!
Sustaining The Operation
NG/G16 129 Is Coming Together....Virtually!
First Pictures Of The New NG/G16 Boiler Construction!
NG/G16 Workshop Progress
Machining has progressed a long way since we last wrote about the new Na locomotive cylinder castings. The first two (seen here) are currently undergoing final machining, whilst at the foundry in South Australia, another 4 pairs are being cast. This allows for a new pair of cylinders for all 5 of Puffing Billy's operating Na class engines.
Below, the casting has been bored to receive the cylinder liner, and holes drilled and tapped in the end face to accept the studs which hold the end covers in place. You can also see the steam port openings, through which steam travels to and from the cylinder from the valve chest, and the small step in the bore which locates the liner in the correct longitudinal position.
A view from underneath, showing the bosses where the holes for the drain cocks will be, and the machined face where the cylinder sits on top of the lower bar frame. There will also be holes to mount the bracket which supports the suspension equalising beam to the front pony truck; there are still to be drilled.
With the cylinders on the existing fleet being over 100 years old, we have a long record of the weak points and where the problems develop. With the design of new patterns for the cylinders, we have taken the opportunity to make all the wearing faces replaceable; the cylinder bores have liners which can be replaced, the port face will have a removable wear plate, and the steam pipe flanges will also be replaceable.
This article first appeared on puffingbillyworkshops.blogspot.com
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