Pocket milling

In the case of pocket milling, the tool drills a rectangular pocket at the selected spindle speed and feed rate in multiple-step operations down to the specified machining depth, and the number of feed operations is programmable. Internally in the cycle, the resulting feed depth is determined on the basis of the final drilling depth. Depending on the command, the cycle can either perform roughing or finishing machine or combined roughing/finishing with one tool. Machining always starts from the pocket's centre point.

The following parameters are required for calling of a pocket milling operation:

Cycle parameters

Description

@P1

Retraction plane (absolut)

@P2

Reference plane (absolut)

@P3

Safety clearance (relative to the reference plane, unsigned)

@P4

Pocket depth (absolute) or...

@P5

...Pocket depth (relative to the reference plane, unsigned)

@P6

1st pocket side ("length" with respect to the 1st main axis of the plane, unsigned)

@P7

2nd pocket side ("width" with respect to the 2nd main axis of the plane, unsigned)

@P8

Corner radius (unsigned)

@P9

Pocket centre point, 1st main axis (absolute)

@P10

Pocket centre point, 2nd main axis (absolute)

@P11

Number of feeds

@P12

Finishing allowance (unsigned)

@P13

Milling direction (clockwise (2), counter clockwise (3))

@P14

Machining type (roughing (1), finishing (2), roughing + finishing (3))

@P15

Machining direction (for offsetting the safety clearance)

@P16 (optional)

Overlapping factor of milling routes (optional in %)

@P17 (optional)

Plunging process (Inclined path (1-Default), Perpendicular (2), Helical (3))

Syntax: 

L CYCLE [NAME=pocketmill.cyc @P1=.. @P2=.. @P3=.. @P4=.. | @P5=.. @P6=.. @P7=.. @P8=..  @P9=.. @P10=.. @P11=.. @P12=.. @P13=.. @P14=.. @P15=.. @P16=.. @P17=..]
Pocket milling 1:
Figure 1-9: Cycle parameters for pocket milling

Programming example

Pocket milling 2:
(Creation of a pocket, 15 mm deep) 
N10 T8 D8 Current tool data 
N20 M6 Tool change 
N30 G00 G17 G90 M03 S4000 Technology values 
N40 Z100 Travel to return plane 
N50 Y50 X65 F500 Milling starting position 
(Pocket roughing, @P14=1) 
N60 L CYCLE [NAME=pocketmill.cyc @P1=100 @P2=80 
@P3=5 @P5=15 @P6=80 @P7=60 @P8=10 
@P9=65 @P10=50 @P11=3 @P12=1 @P13=2 
@P14=1 @P15=-1 @P16=40 @P17=3] 
N65 M5 
N70 T9 D10 New tool data 
N75 M6 Toll change 
N80 G00 G17 G90 M03 S5000 Technology values 
N85 Z100 Travel to return plane 
N90 Y50 X65 F500 Milling starting position 
(Pocket finishing, @P14=2) 
N95 L CYCLE [NAME=pocketmill.cyc @P1=100 @P2=80 
@P3=5 @P5=15 @P6=80 @P7=60 @P8=10 
@P9=65 @P10=50 @P11=1 @P12=1 
@P13=2 @P14=2 @P15=-1] 
N100 G00 Z100 M5 Parking position, spindle stop 
N110 M30 Program end