impact engraver

Hello.
I want to build an impact raster engraver.
X-Y axis are with belt transmision and Z with small ballscrew trivial kinematics.
Z axis is only for correcting height anomalies in engraving material.
The impact hammer is done by a small stepper motor that has coupled a small arm
that has attached a small diamond needle at the end.
For example when load an one bit dithered bmp image file and set engraving speed for example 100mm/s the motion must be constant speed inside engraving area (acceleration-deceration must done outside engraving area) and synchronized with needle impacts.
How this can be done with mesa card?

Is not too slow and gives far better quality than rotating diamond bit method

Something new about integration in linuxcnc of datapainter mesa firmware ?

yes datapainter.. any info about that ?