Lowe's (a big US chain home improvement store) offers black iron pipe cutting and threading services to customers. Basically they sell the pipe & will alter it for you.
From their website in the "We Cut It" section says that they offer:
... pipe threading and cutting for any size galvanized or black iron pipe. The process involves a machine-based cutting operation with a metal wheel that creates threads in the ends of pipes. This service is specifically designed to both thread and cut pipes. No blade is involved in the process.
I italicized the last part of this statement - what is the significance that no blade is involved? I assume it is important or why would they even bother to mention it?
I'm no expert but do have a little experience cutting threads (manual taps & dies) and from what I'd seen I thought pipe threading was essentially the same thing. But this makes me think I'm missing something?
I need to do some pipework projects soon and mainly I just want to make sure I'm educated well enough to do it right! Thanks
Note - there is a "learn more" link on their website, but it doesn't offer information about this.