Bolton part ten
I centred the valve chest in the 4 jaw chuck on the lathe and turned the boss to shape. Note the Aluminium packing required due to the square void in the middle of the chest
The chest was then returned to the mill vice to tap the gland boss
Using the same centring process the hole was drilled and tapped for the valve rod tail guide.
And finally the steam inlet hole and tapped holes to take the pipe flange fixings added.
This concludes the work on this chest for now. I have tapped holes to add later to carry a valve guide bracket and a take off port for a pressure gauge. I intended to add pressure gauges to each cylinder valve chest before I obtained Lees' book, having first seen them on a fine example of this engine built by Brian Newbound. I have the drawings of how James did the cross drilling for this take off but Brian did his slightly differently so I am pondering options.It is an easy job but I want to ensure I am happy with the aesthetics of my chosen method.
I received the chunk of Aluminium today to mill the Engine base along with integral Thrust block. mounting. This is a 400mm long billet of 6" x 2.5" T6. As you can see it isn't light. There is a mountain of material to remove and the finished piece will probably weigh between 1 and 2 kg.
.
I centred the valve chest in the 4 jaw chuck on the lathe and turned the boss to shape. Note the Aluminium packing required due to the square void in the middle of the chest
The chest was then returned to the mill vice to tap the gland boss
Using the same centring process the hole was drilled and tapped for the valve rod tail guide.
And finally the steam inlet hole and tapped holes to take the pipe flange fixings added.
This concludes the work on this chest for now. I have tapped holes to add later to carry a valve guide bracket and a take off port for a pressure gauge. I intended to add pressure gauges to each cylinder valve chest before I obtained Lees' book, having first seen them on a fine example of this engine built by Brian Newbound. I have the drawings of how James did the cross drilling for this take off but Brian did his slightly differently so I am pondering options.It is an easy job but I want to ensure I am happy with the aesthetics of my chosen method.
I received the chunk of Aluminium today to mill the Engine base along with integral Thrust block. mounting. This is a 400mm long billet of 6" x 2.5" T6. As you can see it isn't light. There is a mountain of material to remove and the finished piece will probably weigh between 1 and 2 kg.
.