Classification of CNC machine

1. Based on control system characteristics

• Point to point position system  

In this method, either cutting tool or worktable moves from one point to the required other point
as per requirement.

• Straight line system

In this system, provision is made to machine the workpiece along straight line like
milling and turning.

• Countering system

this system generates a continously controlled motion of the tool
2.Based on positioning co-ordinates:

• Absolute system

In this system, the coordinates of any point are always taken from a fixed pont or workpiece zero.
fixed point is generally the south west corner of workpiece

• Incremental system

In this system, reference point is not fixed but it varies with respect to previous point.
In this system, the coordinates of any poinnts is calculated with reference to the previous position of the tool

 3. Based on feedback or type of control system:

• Open loop control system
• Closed loop control system