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In many case, a manual CNC with digital display of position is sufficient for many simple works. The use of a control panel of a computer is not perfect for manual control.

The project is to use as basis GRBL-MEGA to have a CNC controlled by G-CODE the standard way (GRBL mode) AND have a full manually controlled CNC (manual mode).

A switch will select the mode at reset.

A MEGA is needed to handle all the extra I/O needed. Alternative would be to have a MEGA with CNC firmware controlling through G-CODE a standard GRBL-CNC. This seems less effective as there will be mainly the need for micro-step control.

Input for each axis will be made of rotary encorder with 100 steps per run. Positions will be displayed on some LCD. Buttons will be used to set references and move to these references. Lamps will indicate operating mode.