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CNC Programming “Milling” Module Objectives: 1) To use Topmill 2)To create NC programs for different milling operations

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Milling Machine

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G-Codes FunctionDescription G17,G18, and G19Working plane selection G40Cutter radius compensation OFF. G41Cutter radius compensation ON Left. G42Cutter radius compensation ON Right. G70Input system inch G71Input system metric G00, G01, G02, G03, G04, G54, G90, G91, G94 and G95 Are the same as explained in module 4. New important G codes:

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G-Codes FunctionDescription G111Polar coordinate interpolation G147Approach with a straight line. G148Leave in a straight line. G247Approach with a quarter a circle. G248Leave with a quarter a circle. The following G-Codes and their relative slides will be used as a reference when solving some practical tasks in this module.

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G17, G18, and G19 Used to select the working plane G17 XY Plane G18 ZX Plane G19 YZ Plane The tool axis is vertical to the working plane

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What Is The Correct G-code To Select The Top Surface Of The Workpiece As a Working Plane ? G17

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G41, G42 and G40 With G41 / G42 the tool traverse at equal distances to the programmed contour along its path. This distance is the dimension of the radius of the cutter. If the cutter is left to the contour this is programmed by G41 (This called cutter radius compensation left).

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G41, G42 and G40 If the cutter is right to the contour this is programmed by G42. (This called cutter radius compensation right) To cancel the radius compensation use G40

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G70 / G71 G70: The controller of the CNC milling machine reads the input values in imperial system (Inch) G71: The controller of the CNC milling machine reads the input values in metric system (mm)

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G111 If we want to use polar coordinate system to move the tool, we need first to locate the pole (zero point of the polar coordinate system) measured from original workpiece zero point, this is done by G111. Then write the required movement in polar system by specifying the Angle (AP) and the radius (RP). Example: G111 X30 Y40 Z0 G01 RP=40 AP=60 F300

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G147, G148, G247 and G248 Soft approach and leaving commands. The function of soft approach and leaving serves to approach the starting point of a contour tangentially irrespective of the position of the initial point. The function is mainly used in connection with the tool radius correction; however, it is not obligatory.

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G147, G148, G247 and G248 G147 Approach with straight line G148 Leave in straight line. G247 Approach with a quarter a circle G248 Leave in a quarter a circle

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Cycles CycleDescription Cycle 81Drilling; to make a hole in one phase. Cycle 83Deep Drilling; to make a deep hole, which requires introducing the tool with several phases. (Chip-breaking and chip removal). PocketTo engrave a circular or a rectangular area on a surface. HolesTo repeat a drilling operation following circular or linear contours.

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Cycle 81 – Drilling Cycle To make a hole in one phase

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Cycle 81

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To make a hole in one phase Example: Make a hole at point X20 Y20 to a depth = 10mm

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Cycle 81 Solution: G54 S1500 M3 F120 G00 X20 Y20 Z2 Cycle 81 (2,0,1,-10,0) G0 Z40 M30 Cycle Parameters: Return plane absolute 2 Reference plane absolute 0 Safety distance 1 Final drilling depth -10 Depth incremental 0

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Cycle 83 Deep Drilling Cycle

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Cycle 83

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Cycle 83 (2,2,,-86,,,35,4,1,1,1,1)

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Holes 1 To make a row of holes

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Holes 1

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Holes 1 - Example

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Holes 2 To make a circle of holes

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Holes 2

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Holes 2 - Example

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Pocket – (Pocket1/Pocket2)

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Pocket 1

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Pocket 1 - Example

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Pocket 2

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Pocket 2 - Example

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Example of CNC Programming What Must Be Done To Drill A Hole On A CNC Vertical Milling Machine? Given That: Absolute Positioning Mode, Cutting Tool No. 1, Spindle Speed 1000 RPM, Clockwise Direction Of Rotation At Feed Rate 200 mm/min. Hole Position X10, Y12, And Depth Of Hole 10 mm.

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Solution NC-Program %Mill_1 N005 G54 N010 G90 N015 G97 S1000 M03 N020 T1 D1 M6 N025 ………………… N030 …………………

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Rapid To Hole Position (Above The Hole) N025 G00 X10 Y12 Z10 Tool Home Top View Front View

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Z Axis Feed To Drill The Hole N030 G01 Z-10 F200 Top View Front View

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Rapid Movement In Z Axis Out Of Hole N035 G00 Z6 Top View Front View

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The NC-Program %Mill_1 N005 G54 N010 G90 N015 G97 S1000 M03 N020 T1 D1 M6 N030 G01 Z-10 F200 N035 G00 Z6 N025 G00 X10 Y12 Z10 N045 G00 X100 Y100 Z100 N040 M05 N050 M30

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