Quote Originally Posted by Robin Hewitt View Post
The thread cutters look so flimsy I would be wary of practicing with an expensive one unless I had a lot of iron and huge floods of coolant to back it up
Robin,
It's not in the least bit scary, I've never broken a cutter and I've cut internal threads down to M3.
Provided you run at the recommended rpm you are fine, air + mist lube is sufficient to clear chips and lube the tool and the lovely part is that if you need to or if you are prototyping you can take multiple passes until you get where you need to be ;-)
Regards,
Nick