- November 21, 2016 at 6:52 pm #21342
I was doing my first cut with the MPCNC
so I was using a 1/4″ double flute end mill on plywood
I had a couple spots when the bit was travelling at about a 45 degree angle across the x and y axis
that resulted in some chatter of the end mill.
What is chattering generally an indication of?
the rest of the cutting was very smooth, no burnt spots, didn’t hear the spindle bog at all.
the “saw dust” was very fine… not sure if this is good or bad?
I’m using a 1.5kw spindle… spindle speed was 28,000 rpms
x/y rate was 12mm/sNovember 21, 2016 at 7:00 pm #21345
Tough to say could be anything, loose tool/gantry/machine flex, or bad tool path
The easiest thing to try is spindle speed, if you get a poor cut heavy vibration bad dimensions it is usually too slow, too fast and you can get burning of the wood.
Powder usually means too fast, you want shreds, or small chips. Powder means you are recutting your chips because they can’t get out of the way of the bit as it comes back around so they get cut several times, giving a poor cut quality because your tool is working harder than it should. high spindle speeeds are best with a single flute if you can’t turn your speeds down. 1 cut per revolution is half the speed of 2 cuts per revolution.November 21, 2016 at 7:16 pm #21347
tool is securely fastened…gantry all seems to be tight..
tool path was generated by estlcam .. not too sure of ways to change this.
interesting… alright I may run it again and try lowering the speed to see how it changes things.
thanks for your time it’s appreciated.November 22, 2016 at 12:02 am #21359
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