Ideas for making "Making the throat plate " Throat plate First mark our where I need to flange by chain drilling Then drill the holes for the stays   and then cutting with a metal Chisel and finish by filing Make up the former in MDF  and drill holes to fix locating pins With the throat place the work requires opening out the smaller hole to fit the former and continue this with period of annealing A backing piece of MDF is also required to ensure the copper remains flat Use a piece of MDF the size of the tube to check that the hole formed will fit the tube Then former needs to be made to bend the sides of the throat Remember to check square with a try square.
24th Feb 2025 I have bought a piece of MDF 18mm thick which is quite heavy !! This is in preparation for cutting the formers for bending and folding the part for the boiler.
26th Feb 2025 Tidying up the workshop ready to cut formers for boiler from MDF.
14th March 2025 The size of the MDF that I need to cut takes account of two side and the front which is 4 1/4" plus 4 1/4" plus 4 1/4" so that makes 12 3/4" x 7 1/4".
The piece has been marked out to find the centre of the circle to be drawn to make an opening through which the copper will be beaten to form the connection to the boiler barrel. The copper sheet is measured at 2.5mm  so a circle must be drawn of 53.3mm Radius.
The copper sheet has been marked out and the hole cut which will be annealed and then fixed the the MDF and then beaten to make the fit to the boiler barrel.
20th March 2025 Today being the warmest in 2025 I decided to cut the hole in the former.
23rd March 2025 Cut the backing piece and cut the hole in it to match that of the front piece.