Novice lathe users, first time threading. I keep getting bad to very bad results, the thread is very very rough, looks like it's tearing more than cutting. I'm attempting to cut M15 x 1 thread, using a hss bit ground to 60°, 300 rpm, 0,25mm depth of cut. I've tried both the straight in method feeding in with the cross slide as feeding in with the compound at 29°. Both had same result. Usually it all goes well till I'm getting near to the final pass, then it starts tearing and often a bit of metal is stuck to the bit (see picture). Any advice, thanks Christof?