probably a dumb question but i have been watching some vids on utube about boiler making and i have this question,why do you beat and aneal the ends of the boiler why cant you do them by spinning?
No reason why you can't spin them but most people find hammering them over a former easier than spinning and the firebox, backhead and throatplate would have to be done with hammer and former anyway. I have also seen press tools made to press the round tubeplate.