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User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

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8 Cycles<br />

8.2 Simple Fixed Cycles<br />

CIRCULAR POCKET MILLING G77/G78<br />

<strong>TNC</strong> <strong>360</strong><br />

Process<br />

• Circular pocket milling is a roughing cycle. The tool penetrates the<br />

workpiece from the starting position (pocket center).<br />

• The cutter then follows a spiral path at the programmed feed rate (see<br />

Fig. 8.10). The stepover factor is determined by the value of k (see<br />

POCKET MILLING cycle G75/G76: calculations).<br />

• The process is repeated until the programmed milling depth is reached.<br />

• At the end of the cycle the tool returns to the starting position.<br />

Required tool<br />

This cycle requires a center-cut end mill (<strong>ISO</strong> 1641) or a separate pilot<br />

drilling operation at the pocket center.<br />

Direction of rotation for roughing out<br />

Clockwise direction of rotation G77<br />

Counterclockwise direction of rotation G78<br />

Input data<br />

• SETUP CLEARANCE A<br />

• MILLING DEPTH B : DEPTH of the pocket<br />

• PECKING DEPTH C<br />

• FEED RATE FOR PECKING:<br />

Traversing speed of the tool during penetration.<br />

• CIRCLE RADIUS R :<br />

Radius of the circular pocket.<br />

• FEED RATE:<br />

Traversing speed of the tool in the working plane.<br />

Fig. 8.10: Tool path for roughing out<br />

C<br />

Fig. 8.11: Distances and infeeds with<br />

CIRCULAR POCKET MILLING<br />

Fig. 8.12: Direction of the cutter path<br />

A<br />

B<br />

F<br />

G78 G77<br />

R<br />

8-13

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