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I have tried every speed and feed combination and almost anything works for 90% or more. It is just that less than 1% where I have to reduce the feed to about 40% and it still chatters.

I tried to make the motor driver fault when the motor is overloaded and can not do it. The minimum max amps is something like 1.9 amps and holding a wooden stick on the spindle nuts until it burns, the motor does not stall or trip the overcurrent so this is not an option.

However I think I finally figured out what the "real" problem is. The motor has plenty of power and the bit can certainly cut through almost anything. I have a forth axis to machine three surfaces of the part. It uses a stepper and a pneumatic that "locks" the forth axis in place. However is is just a block that clamps one of the three surfaces of the pneumatic "vise"

What is actually happening is that when the bit hits the strange hard uneven end grain instead of cutting it moves the part along the third axis tries to climb the block and just plain fucks up. I had noticed the vise moving along the fourth axis (rotary) but never made the connection that this is the beginning of the serious fuckup. If the fourth axis did not budge the bit would probably roughly chew through the tough grain.

So after I get some work done today I am going to make the "lock" a real lock with a pin instead of just a clamp. However when the awful chatter happens it is likely to lose steps so I have to re home the machine but at least I will not break the cutter or run it into the cylinder on the vise or ??? in the next move.

Spencer, you might try reducing your spindle rpm. Hardwoods sometimes burn and form a carbon layer at higher speeds.

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Best regards, Spencer Chase
67550 Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...


(425) 791-0309