Building the Victoria - Small Parts.


All the glands and steam unions were made from the same piece of blank bar and followed the same process described here.

Also shown here are some general guidelines for creating some of the small intricate parts of the valve gear.

Exhaust Gland
The blank bar was mounted in the 4-jaw chuck as shown.
To make the process easier the DTI was mounted on the carriage so that small motions on and off the work piece could be used to measure its position. This was necessary because the ovality of the workpiece was greater than the travel of the DTI needle.

Centring up the Workpiece
 
Once centred then the face of the part was machined to give any shoulder required and a hole drilled, reamed and tapped if necessary.

Parting off was trouble, so each part was hand cut from the bar stock.
 
Each part was then reversed and placed in the 3 jaw chuck to tidy up the back face, and machined to final thickness.

Also in this setting, a sharp tool was used to mark the diameter of the two locating screw holes.

A centreline was scribed by eye before drilling the two holes in the drill press.

Marking the Mounting Hole Radius

The pivot block for the valve gear was machined on the milling machine.
Drilling Mounting Holes

Milling Shoulders
The blank bar was set up in the milling vice ensuring that the vice was square to the milling axis.

The centre of the part was found using a centre finder.

First, two mounting holes were drilled on the centreline equidistant from the centre of the part.

Then milling cutters were then used to create the end shoulders and the central slot.

Cutting Centre Slot
The 4-jaw chuck was used in the lathe to create a pivot hole that was exactly square to the frame of the block.

First the hole was marked on one of the end faces.
Then this was used to set the part central for centre drilling, drilling and reaming of the hole.

Drilling the pivot block

The pivot bar for the block was an axle with two reduced diameter sections, one on each end.
To avoid difficultly expected when machining a long thin length of bar to a precise diameter, the part was made from a piece of sliver steel and a machined collar silver soldered in place.


Drilling the collar part.

Pivot parts

Pivot assembled

The eccentric link bar required a bent section with a certain offset.
The part was bent in the vice with a soft mallet and then clamped around one of the pivot links to find where the return bend should be made.
Drilling for the pivot bolt was done with all the parts assembled and clamped in place so that there would be no misalignment.
Locating the return bend position against one of the pivot links.

Drilling for the pivot bolt.
All of the pivot links and rounded rod ends we made using filing buttons clamped in place.

The filing buttons were drilled to take a bolt and turned to the required outside diameter.
They were heated to red hot and quenched to make them hard.

Filing up to the buttons then resulted in a smooth curve to each part.

Filing a Rod End

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