The machine is choppy when using MPG

Hello!
    I installed the LinuxCNC on my machines. When using MPG, the machine shakes violently. I referred this  [topic][ www.forum.linuxcnc.org/38-general-linuxc...choppy-motion#299365 ].
Set the axis.N.jog-accel-fraction 0.5   One machine goes well, but the other doesn't work. I use the ilowpass to them, it can run smoothly, but it will be very 'lazy'. Even I stop the MPG, the axis still run. I set ilowpass.scale 0.9   ilowpass.gain 0.85 . Now I want to know is there other methods to salve it.

I appreciate you for your replay.
 

I think it is probably worth investigating _why_ jog-accel-fraction isn't working on the second machine.

One drawback of ilowpass is likely to be that it prevents the joint.N.jog-vel-mode setting from working properly (as the rest of the system dosn't see the jogwheel stop)