Kozo K27 Cylinders



I happened to find an ad on the auction site listing a matched set of 2 3/8 diameter bars that already had a 1" hole through them. This saved quite a bit on cost and machining time. The first cylinder has been machined to size with a 1.338" bore and just under 3" long. September 9, 2019.


The pair of cylinders have been completed with the flats machined to support the steam chest and steam passage. September 14, 2019.


The first steam chest with all of the lathe work completed. A series of 5 internal grooves had to be machined in this piece which is about 2" in diameter and over 3" long. The outer diameter will need a couple of flats milled into it like was done with the cylinders. September 17, 2019.


The lathe work for both of the steam chests has been completed. September 21, 2019.


This shot shows how the steam chests fit into the flats that were milled on the top sides of the cylinders. September 21, 2019.


The flats have been milled into the steam chests to all them to mate up with the cylinders at the correct angle. This view is the side that will face the locomotive and a steam passage block will fit into the visible flats. September 28, 2019.


Four brass end plates have been stacked and bolted together so that they can all be bored for the cylinders and steam chests at the same times. The three holes will be used to attach them to the faceplate on the lathe at various stages of the machining. The steel plate will be used as a spacer between the brass and the faceplate during boring of the hole for the cylinders. A second spacer will be required for the boring of the hole for the steam chests. October 5, 2019.


The end plates have been bored for the cylinders and steam chests as a matched set. Two 30 degree angles have been machined which will be used to orient the cylinder assembly during further machining operations. The next step will be machining the steam passage blocks before soldering the assemblies together. October 20, 2019.


The cylinder assemblies have been temporarily assembled to check the fit. The next piece will be the steam passage block that will fit into the V seen on the backside of the assembly on the right. November 10, 2019.