In this video, we dive into Basic CNC Programming using Absolute Mode (G90) for a turning operation.
Learn how to write a CNC program step-by-step for a product with a defined geometry.
Understand the Cartesian coordinate system, workpiece dimensions, and tool movement.
Explore the use of key G-codes and M-codes like G00, G01, G90, G28, M03, M08, and more.
Compare Absolute Mode (G90) with Incremental Mode (G91) and identify their differences with examples.
The video is perfect for students, CNC beginners, and machining professionals who want to enhance their programming skills and master CNC turning operations.
🔗 Topics Covered:
Workpiece geometry and operation identification.
Step-by-step coordinate table for absolute programming.
Complete CNC program for Absolute Mode.
Spindle speed, feed rate, and toolpath safety.
Quick comparison with Incremental Mode.
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Watch the previous lecture on Absolute vs. Incremental Modes for better understanding.
Learning Outcomes
Understanding CNC Programming Modes
Students will understand the fundamental difference between absolute mode (G90) and incremental mode (G91) in CNC programming.
They will learn when and how to use these modes effectively in different machining scenarios.
Program Development for Absolute Mode
Students will be able to write a complete CNC turning program in absolute mode using:
Basic G-codes like G00 (rapid movement), G01 (linear interpolation), G28 (return to home), and G90 (absolute positioning).
Supporting M-codes like M06 (tool change), M03 (spindle on clockwise), M08/M09 (coolant control), and M30 (end of program).
They will learn the logical sequence of CNC program blocks, including initial setup, machining operations, and tool retraction.
Geometrical Analysis of Workpiece
Students will develop the ability to:
Analyze the geometry of a given part (e.g., diameters, tapers, lengths).
Identify and calculate Cartesian coordinates (X and Z positions) for each machining point based on absolute mode.
They will prepare a coordinate table to simplify CNC programming.
Program Development for Incremental Mode
Students will learn to write the same CNC program using incremental mode.
They will understand:
How each machining point is referenced relative to the previous point instead of a fixed origin.
Mathematical calculations for incremental values to achieve the desired shape.
Decision-Making for Operations
Students will learn to identify whether a given machining operation involves turning, milling, or drilling.
They will recognize that turning involves a rotating workpiece with a stationary tool.
Tool Path and Safety Considerations
Students will understand the importance of avoiding tool collisions by positioning the tool slightly away (e.g., X11.0 instead of X10.0) during initial movements.
They will be able to safely retract the tool and return it to the datum position after completing the operation.
Application of Feed Rates and Spindle Control
Students will apply the correct feed rates (F200) and spindle speeds (S1000 RPM) to optimize machining performance.
They will understand spindle direction commands like M03 (clockwise) and M04 (counterclockwise).
Practical Hands-on Programming
By comparing absolute and incremental programs, students will gain confidence in creating accurate CNC programs for real-world applications.
They will identify the advantages and limitations of each approach in CNC operations.
Skills Acquired
Writing CNC programs for turning operations in both absolute and incremental modes.
Identifying toolpaths and calculating coordinates for machining points.
Understanding and applying essential G-codes and M-codes.
Developing logical thinking for CNC program sequences and safety protocols.
Applying mathematical concepts to determine relative and absolute positions.
Future Applications
Students will be equipped to:
Write programs for more complex parts requiring multi-step machining processes.
Transition seamlessly between absolute and incremental programming modes.
Work on industrial CNC lathes to produce precision components.
Develop advanced CNC machining skills for CAD/CAM integration.
This comprehensive understanding will build a strong foundation for further learning in CNC programming and operations.