torch vibrates when moving slow

[cruz03]

hi everyone,

i've noticed something with my plasma table,
when cutting something with a "lower" speed the torch and torch mount vibrate.
this is only noticeable when it's moving in both (x and y) directions.
if i bump the speed up it gets way less worse.
with a speed of 3000mm/min it vibrates alot (small fast vibrations)
when i go up to 5500mm/min it's noticeable less

this may sound weird but i'm not sure if it has servo or stepper motor,
if needed i could take picture of the motor setup.

is this something in the motor tuning or is it in the machine build up (not rigid enough)?
or does anyone have a idea where the problem lies and could be solved

thank you!

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[cruz03]

has nobody any idea's or suggestions what the problem could be
here's a link to a video while the machine is running:
https://mega.nz/#!GPJwwSIb!Bv8JHZdQe...uGR1rmypSnujMI

some pics of mach3 setting for the motors: