We are progressing with the building of the boiler. The first job is drilling all the holes in the steam and mud drums.
We have 1,236 to do, and so far we have finished 824 of them – it’s boring!
The next job is to use a countersink bit on a air ratchet (hopefully) to de-burr the inside of all the holes.
Then we will mount the drums into the casing end-plates. and start fitting the tubes… We are using Ashby Welding in Church Crookham to plasma-cut the casing bits from 3mm plate, and they are also cutting the blanks for the drum end covers and the economiser and super-heater headers from 20mm plate.
Here is a picture of the CAD drawings I created to drive the plasma machine…