gf beranek
Old Schooler
This guy talks you through it.
Yes, but not much thing on it to catch, and small speed. I'd guess he does that to dampen it and limit the vibrations/resonnance resulting in chattering and wavy surface.Was anyone else concerned about the guy holding his hand on the rotating shaft?
Thay's exactly that, but the grease is vaporized like micro explosions which blow away the liquid metal.Btw, he said you can't weld over grease, I get that but doesn't the heat of welding vaporize grease and pretty much everything else?
Yes and yes. If hole(s) or spongy material is left, this area can't hold locally the same load as the good ones. The bearing isn't supported as good as it should be. That can lead to some moves between the parts and/or fatigue failure (either of the bearing or the holding part)..So duh, Q: the big bearing (?) he pressed into the repaired piece at the end, he did all that work so that the bearing would be fully and evenly seated on good, virgin-type material, right? And then, over time, the bearing will take the wear and hopefully when it is getting worn out, they will press out the worn bearing and press in a new one without the need for all that machining, right?