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CNC Program Execution Modes: MDI, Single Block, and Auto

 


CNC Program Execution Modes: MDI, Single Block, and Auto

CNC (Computer Numerical Control) machines offer different execution modes to cater to various operational needs, from manual interventions to fully automated production runs. Here's a detailed look at three fundamental execution modes: MDI (Manual Data Input), Single Block, and Auto (Automatic).

1. MDI (Manual Data Input) Mode

  • Purpose: MDI mode allows the operator to enter and execute individual CNC program blocks or a short sequence of blocks directly through the machine's control panel. It's primarily used for:

    • Manual machine setup: Executing commands for tool changes (M06), spindle start/stop (M03, M05), coolant control (M08, M09), and axis movements for referencing or positioning.
    • Performing quick operations: Running a simple facing cut, drilling a single hole, or checking machine functionality without writing a complete program.
    • Troubleshooting and testing: Isolating and executing specific commands to diagnose issues or verify program logic.
    • Teaching: Some controls allow using MDI in conjunction with a "Teach In" function to record manual movements and store them as program blocks.

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