machines which I have made, am making, or intend to make, and some other stuff. If you find this site interesting, please leave a comment. I read every comment and respond to most. n.b. There is a list of my first 800 posts in my post of 17 June 2021, titled "800 Posts"
6″ Vertical Boiler. CNC Drilling Firetube Holes
After all of the careful flange forming I was careful to not screw up the firetube perforations in the boiler end plates. At times like this it is great to have a CNC mill/drill.
The wooden form is useful as a clamping aid.
No major stuff ups (or should it be “stuffs up”?). And I am not pointing out the small ones. I was unsure in the firebox plate which side to chamfer. Will I silver solder the top side or the bottom side? Eventually I decided that I would solder between the firetubes rather than the underside. Still unsure whether that was the best decision.
The “ligaments” (the metal between the holes) must not be less than 3mm. The minimum in these plates is 3.5mm. The holes are chamfered to make the silver soldering process easier. The extra hole in the top plate is to install the bronze bush for the attachment of the wet header.