What is MDI/MDA mode in CNC ?

MDI /MDA MODE – MDI (Manual dada input ) /MDA (Manual data automatic )

                        Some siemens (sinumerik) control case MDI is called MDA. If the CNC command has a competent operator, it uses this mode to perform very fast functions. MDI mode is used for single commands. It executes several 3 functions. These include Axis home position, indexing tool and spindle rotation. Let's take a closer look at how this mode is used.

        1) HOME POSITION – This  function is used for home position to XZ axis .                                                                   The following block is used for a home position ;

                                                G28 U0.00 W0.00 ;

                               ( Reference point command , where X 0 & Z0)

                 Step1 – Press “ MDI” key

          Step2 – Press “PROG” (Program) key. Keep pressing 

                  that key constantly until the “Program MDI” 
                  is written to the screen.

          Step3 – Type code “G28 U0.00 W0.00”

          Step4 – To complete Block Press “EOB key. (;)

          Step5 – Press “INSERT” key.

          Step6 – Press “ CYCLE START” key.

                    

        2) TOOL INDEXING – This function is used to change tool on turret by using                                                             the following code ;

                                                      T0100 ;  or  T0202 ;

                               (where 01 or 02 – tool no. , 00 Or 02 – tool offset no .)

          Step1 – Press “ MDI” key

          Step2 – Press “PROG” (Program) key. Keep pressing 

                  that key constantly until the “Program MDI” 
                  is written to the screen.

          Step3 – Type code “T0100”

          Step4 – To complete Block Press “EOB key. (;)

          Step5 – Press “INSERT” key.

          Step6 – Press “ CYCLE START” key.

          3) SPINDLE ROTATION – This function is used to rotate the spindle .                                                                                Following code is used for spindle rotation ;

                                                      G97 S200 M03 ;

                  (where G97- constant surface speed control, S2000- speed 2000 r.p.m. ,                                                    M03 – spindle rotate clockwise )

                     We can use simply S2000 M03; but above is a perfect way.

          Step1 – Press “ MDI” key.

          Step2 – Press “PROG” (Program) key. Keep pressing 

                that key constantly until the “Program MDI” 
                is written to the screen.

          Step3 – Type code “G97 S200 M03”

          Step4 – To complete Block Press “EOB key. (;)

          Step5 – Press “INSERT” key.

          Step6 – Press “ CYCLE START” key.