How To Countersink Brass W/O Chatter

As Mike said, countersinking before drilling the hole, fairly well eliminates chatter. Slowing the rpm also helps. In some cases, I have actually turned the spindle by hand. I have seen countersinks where the flutes are not equally spaced which will tend to eliminate the harmonics that cause chatter but I haven't actually tried one as yet.
 
Ok! And wow! Rhanks to everyone for the excellent tips. Will try the MA Ford Uniflute and the many tips on same test material. Will let you know how it goes.
 
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