It sounds like they've got a metal lathe in the workshop next door.
And that's quite all right, only it doesn't sound like they're using it for any actual constructive purpose.
It sounds like they're just trying to get it to sound like a cat. In heat.
Wow, that sound sure is annoying.
If I were the type to use the "Current Mood" feature here on LiveJournal this is where I'd choose the "Annoyed" mood to let you know that I am, indeed, annoyed.