Building the Victoria - Piston and Piston Rod.

The piston and rod would need to be concentric to ensure the rod passed through the front cover of the cylinder with minimal friction.

The Piston and Rod

The piston was cut from the cast iron bar stock in one setting in the 3jaw chuck.

The overall diameter was made to suit
the cylinder.

The parting off tool was used to create a groove large enough for the O-ring provided

Before parting the work off the stock the end was recessed with a boring too and drilled and tapped to suit the piston rod.

Creating the piston profile

Boring the recess

Parting off the completed piston.

The piston rod was held perfectly central in the 4-jaw chuck so that a concentric shoulder could be turned on the part (a collet chuck could also be used if one is available).

The shoulder was turned with a sharp tool to create a nice square datum face for the piston to pull up to.

Turning a shoulder on the piston rod

The piston was fitted to the rod before removing from the chuck to check for absolute concentricity. The piston was secured with a lock nut and a dab of Loctite.

In reality there will always be small run out due to assembly variation but it should close enough such that the packing in the piston rod gland and the compliance of the O-ring should allow the engine to run.
Piston and ring assembled