Machine1,
When you say the part is hanging out in the air, that sounds like a big part of the problem. Is there any way to put a finger stop against it from one side, while you go at the other? Anything to help soak up the resonant vibes.
Also, brand new HSS endmills often have a little too much clearance, which "enhances" the chattering tendency. As a rule of thumb, when I set up to sharpen a cutter or a hand reamer, I like to see about .005" drop in 1/8" of circumferential rotation for a low clearance cutter that will not chatter so badly.
If you could "break it in" on something else without buggering it up, it might quiet down a little later. They say this is what a honing stone is good for, but it is pretty tough to hand hone the flutes of an endmill.
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |