**Keyword：**
CNC machining parts
Auto Spare Parts
Milling machining
Fixture Parts
Turning parts

Contact person: Mrs Wendy

Phone: (86) 15362889256

E-mail: sales@dgmtwj.cn

Tel: (86) 769-88315115

wechat: +86 15362889256

Factory: No.2, Baidai Industrial Park, Daojiao Town, Dongguan, China ，

Hotline：*(86) 15362889256*

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**Computer numerical control** (**CNC**)
is the automation of machine tools by means of computers executing
pre-programmed sequences of machine control commands. This is in contrast to
machines that are manually controlled by hand wheels or levers, or mechanically
automated by cams alone.

In modern CNC systems, the design of a mechanical part and its
manufacturing program is highly automated. The part's mechanical dimensions are
defined using computer-aided design (CAD) software, and then translated into
manufacturing directives by computer –aided manufacturing (CAM) software. The
resulting directives are transformed (by "post processor" software)
into the specific commands necessary for a particular machine to produce the
component, and then are loaded into the CNC machine.

Since any particular component might require the use of a number
of different tools –drills, saws, etc. – modern machines often combine multiple
tools into a single "cell". In other installations, a number of
different machines are used with an external controller and human or robotic
operators that move the component from machine to machine. In either case, the
series of steps needed to produce any part is highly automated and produces a
part that closely matches the original CAD.

Example Of CNC
Machining:

%

o0001

G20 G40 G80 G90
G94 G54(Inch, Cutter Comp. Cancel, Deactivate all canned cycles, moves axes to
machine coordinate, feed per min., origin coordinate system)

M06 T01 (Tool
change to tool 1)

G43 H01 (Tool
length comp. in positive direction, length compensation for tool)

M03 S1200
(Spindle turns CW at 1200RPM)

G00 X0. Y0.
(Rapid Traverse to X=0. Y=0.)

G00 Z.5 (Rapid
Traverse to z=.5)

G00 X1. Y-.75
(Rapid traverse to X1. Y-.75)

G01 Z-.1 F10
(Plunge into part at Z-.25 at 10in per min.)

G03 X.875 Y-.5
I.1875 J-.75 (CCW arc cut to X.875 Y-.5 with radius origin at I.625 J-.75)

G03 X.5 Y-.75
I0.0 J0.0 (CCW arc cut to X.5 Y-.75 with radius origin at I0.0 J0.0)

G03 X.75 Y-.9375
I0.0 J0.0(CCW arc cut to X.75 Y-.9375 with radius origin at I0.0 J0.0)

G02 X1. Y-1.25
I.75 J-1.25 (CW arc cut to X1. Y-1.25 with radius origin at I.75 J-1.25)

G02 X.75
Y-1.5625 I0.0 J0.0 (CW arc cut to X.75 Y-1.5625 with same radius origin as
previous arc)

G02 X.5 Y-1.25
I0.0 J0.0 (CW arc cut to X.5 Y-1.25 with same radius origin as previous arc)

G00 Z.5 (Rapid
traverse to z.5)

M05 (spindle
stops)

M30 (Program
End)

%G00 X0.0 Y0.0
(Mill returns to origin)

Having the correct Speeds and Feeds in the
program provides for a more efficient and smoother product run. Incorrect
speeds and feeds will cause damage to the tool, machine spindle and even the
product. The quickest and simplest way to find these numbers would be to use a
calculator that can be found online. A formula can also be used to calculate
the proper speeds and feeds for a material