Hi
Back to the chimney. I figured out a way to do it with the tools I have and available materials.
Starting with some steel in the lathe turn the boss to size
Followed by some drilling then boring
Now I needed to create the bell mouth. The 2 red lines on the drawing show the 2 cuts I made by swivelling the top slide over
Followed by some work with course then medium emery cloth
Reverse in the chuck and part off
Then a combination of cutters to create the profile and bore out for the chimney tube
The chimney tube is a bit of steel tube
The saddle part starts life as a bit of 3/16" thick steel and a cardboard template
Drill 2 6mm holes in the steel plate and drill and tap 2 M6 holes in a bit of steel tube thats the same size as the smoke box
Then attack it with the oxy propane torch and a hammer
Set up in the mill and drill and bore the hole
Flatten off a bit
Remove the waste and file to shape gives us this
In the brazing hearth. I used sif bronze for this as it has better fill capabilities
A scrap of wood with an M8 coach bolt and a large washer to hold it for filing and fettling
Ladies and gentlemen I think we have a chimney base
Cheers
Rich