Since I don't know what it is, I probably don't need it, but what is it for?
Think of a lathe spider as a ( set ) of integrated parallels for the chuck. A lathe spider is used as a part dead stop or to keep thin profile work parallel to the machine or both.^^
Same. I'm not dense but I still don't get what it does/it's purpose even after seeing it in action in the pics. There's no explanation in the article, but since it's a pro machinists technical magazine it's likely obvious to the intended audience.
Oh and congratulations getting published again.
It's a beautiful, spread wide-open, laying on the bench with nothing covering it...That's great!
But who is the centerfold?