4
Spindle speed is generally selected based on cutting speed, the formula is:
Where: D is the tool diameter, Vc is the cutting speed.
The spindle speed override (override) switch on the CNC operator panel, It can be in the process of the
spindle speed to be adjusted. As shown in Fig. 1-5:
Fig. 1-5
1.4 Tool Function
When drilling, boring, milling and other processing, you must select the appropriate tool. To assign a number
to each tool, command different numbers in a program, you select the appropriate tool.
In the machining center T code is typically used in conjunction with the MO6. When the 1st bit when
specified as:
Position the tool magazine 01 positions, the T01 can be selected by an instruction that the tool, which is
called the tool function.
Format:
T ○○
；
1.5 Accessibility
Start command machine components and stop operations function is called auxiliary functions.
Typically, the function specified by M codes. Sports instruction and auxiliary function commands can be
executed simultaneously in the same block.
For example: When the instruction M03, the spindle speed specified spindle clockwise.
2 The Basic Structure of Program
Program is a set of instructions which is sent to CNC for running. Program guides tool moving along
straight or circular at a certain speed, and spindle motor rotate or stop according the command.
2.1 Program
Program is made of multiple blocks which is a set of single step instructions, and block is the basic unit of
processing program. Block is composed of one or more words and is end by end mark
（
EOB
，
ISO code is LF,
ELA code is CR, screen displays. The basic structure of program is as follows.
Chart 2-1 Program for Example
