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"
Trevithick Dredger Engine Boiler Bushes
Drilled previously, with wooden plug to prevent boiler deformation
Bushes made, but one is a bit tight, so using the Dremel to make it a loose fit, in preparation for silver brazing.
That is about right. Roughly 3-5 thou gap.
The middle bush and the right hand one are additions to the Trevithick concept. The middle one is a banjo fitting which will eventually connect to a modern pressure gauge… a boiler inspector requirement. The big one is a water filler point.
All plugged up, ready for silver brazing then a boiler inspector hydrostatic test. The thread which is visible is blind. It does not communicate with the boiler cavity.