Specifications

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CONCISE GUIDE FANUC 7
1.0 FOREWORD
On an NC machine tool the sequence of the instructions programmed to process a workpiece consists of
codes which are made up of functions or addresses with a relevant numeric value.
When preparing a part program the tool path is imagined referring to a system of co-ordinates, the origin
of which (
=> zero point to which all the dimensions refer) can be chosen. In the specific case of
an NC lathe this co-ordinates system is composed of two or more axes:
• axis X (for diameters).
• axis Z (for lengths).
• axis C (for angle divisions on lathes
with controlled spindle).
• axis B (for the longitudinal position of the back spindle
on machines fitted with this option).
• axis A (for angle division on lathes with controlled
back spindle).
X+ X+
C+ A+
Z+ B-
The tool path is programmed with co-ordinated points written in the correct sequence and established
according to the workpiece profile. Each movement of the tool along this path is written as a separate
instruction (block) together with any technological data required. The group of blocks forms the “PART
PROGRAM”.