Pipe threads in brass/bronze?

[Fred_V]

This was a brand new die from Japan. I think the biggest problem is the naval brass, tough stuff. I've had problems with regular brass also but I think it was more that the dies/taps were used on steel too. I should follow Bill's suggestion.

[Bruce_Mowbray]

I like to use Moly-Dee on stringy naval and aluminum bronze. It keeps the brass from sticking to the die teeth and tearing the threads. I also keep my new dies for brass and the old ones for steel. For a tapered thread, it's always best to taper the part being threaded, especially with the fine MTP threads. The excess chips get bound in there quickly and the excess heat causes the brass to expand into the back clearance of the die. Can you say SQUEEEAAAAL

[Fred_V]

I like to use Moly-Dee on stringy naval and aluminum bronze. It keeps the brass from sticking to the die teeth and tearing the threads. I also keep my new dies for brass and the old ones for steel. For a tapered thread, it's always best to taper the part being threaded, especially with the fine MTP threads. The excess chips get bound in there quickly and the excess heat causes the brass to expand into the back clearance of the die. Can you say SQUEEEAAAAL

I think my problem has been technique. I'm making changes and the last 1/4" thread went better. I'll try the Moly-Dee. I use it on steel threads.
Thanks Bruce,