Can anyone explain why on earth you would counter bore a pipe at all, let alone after installation? I read the article but couldn’t understand the explanation. It seems like a totally ludicrous way to make a pipe.
The counterbore accommodates a filter element. Maybe they were worried it could change the interference fit if they drilled them before installation, or wanted the swaging effect.
It's probably significantly easier to machine it this way. The pipe is curved, so work holding isn't straightforward. Once the blank is installed in its place in the bearing chamber face then you can just move that larger part around to machine all the features in it, including the counterbore.
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Can anyone explain why on earth you would counter bore a pipe at all, let alone after installation? I read the article but couldn’t understand the explanation. It seems like a totally ludicrous way to make a pipe.
The counterbore accommodates a filter element. Maybe they were worried it could change the interference fit if they drilled them before installation, or wanted the swaging effect.
It's probably significantly easier to machine it this way. The pipe is curved, so work holding isn't straightforward. Once the blank is installed in its place in the bearing chamber face then you can just move that larger part around to machine all the features in it, including the counterbore.