G73 is used for deep hole drilling. It adopts interrupted feed during drilling, which is good for chip breaking and chip removal and is suitable for deep hole machining. Figure 1 shows the working process of high-speed deep hole drilling. Where Q is the incremental value, specify the depth of each cut. d is the amount of chip removal, set by system parameters.

Figure 1 High-speed deep hole drilling cycle

For example, the 5-mm-8 mm deep 50 mm hole shown in Fig. 2 is machined. Obviously, this is deep hole machining. The procedure for deep hole drilling with G73 is:

Figure 2 Application example

O40
N10 G56 G90 G1 Z60 F2000 //Select the No. 2 machined coordinate system to the Z start point
N20 M03 S600 //Start Spindle
N30 G98 G73 X0 Y0 Z-50 R30 Q5 F50 // Select high-speed deep hole drilling method No. 1 hole
N40 G73 X40 Y0 Z-50 R30 Q5 F50 // Select high-speed deep hole drilling method No. 2 hole
N50 G73 X0 Y40 Z-50 R30 Q5 F50 // Select high-speed deep hole drilling method No. 3 hole
N60 G73 X-40 Y0 Z-50 R30 Q5 F50 // Select high-speed deep hole drilling method No. 4 hole
N70 G73 X0 Y-40 Z-50 R30 Q5 F50 // Select high-speed deep hole drilling method No. 5 hole
N80 G01 Z60 F2000 //Return Z start point
N90 M05 //Spindle stop
N100 M30 //The program ends and returns to the starting point

The machining coordinate system settings: G56 X=-400, Y=-150, Z=-50.
In the above procedure, high-speed deep hole drilling was selected to perform hole machining, and after G98 was determined for each hole, it was returned to the R plane. Set the Z coordinate of the surface of the orifice to be 0, the coordinate of the R plane to 30, and the Q of each cutting depth to be 5. The system sets the removal amount d of the cuttings to 2 places.

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