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3.4.1 Structure of an NC Part Program

Commands are input into the controller in units called blocks or statements.

Block Format:

1. Fixed sequential format

2. Tab sequential format

3. Word address format

EXAMPLE:

Assume that a drilling operation is to be programmed as:

1. The tool is positioned at (25.4,12.5,0) by a rapid movement.

2. The tool is then advanced -10 mm in the z direction at a feed rate of 500 mm/min., with the

flood coolant on.

3. The is then retracted back 10 mm at the rapid feed rate, and the coolant is turned off.

1. Fixed sequential format

0050 00 +0025400 +0012500 +0000000 0000 00

0060 01 +0025400 +0012500 -0010000 0500 08

0070 00 +0025400 +0012500 +0000000 0000 09

2. Tab sequential format

0050 TAB 00 TAB +0025400 TAB +0012500 TAB +0000000 TAB TAB

0060 TAB 01 TAB TAB TAB -0010000 TAB 0500 TAB 08

0070 TAB 00 TAB TAB TAB -0000000 TAB 0000 TAB 09

3. Word address format

N50 G00 X25400 Y125 Z0 F0

N60 G01 Z-10000 F500 M08

N70 G00 Z0 M09

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