G & M Codes

G & M Codes

G&M Codes make up the most of the contents of the CNC program. The definition of each class of code and specific meanings of the most important codes are covered next.

G-Codes

Codes that begin with G are called preparatory words because they prepare the machine for a certain type of motion. The most common G-codes are shown in Table 5.3 and a complete list and their meaning is included in Appx D - G-M Codes Reference.

	Note: Older controls required G-codes to be written with a leading zero, like G01. Most machines now allow the leading zero to be omitted, as shown in the table below.
Table 5.3: Common G-Codes
Code	Meaning
G0	Rapid motion. Used to position the machine for non-milling moves.
G1	Line motion at a specified feed rate.
G2	Clockwise arc.
G3	Counterclockwise arc.
G4	Dwell.
G28	Return to machine home position.
G40	Cutter Diameter Compensation (CDC) off.
G41	Cutter Diameter Compensation (CDC) left.
G42	Cutter Diameter Compensation (CDC) right.
G43	Tool length offset (TLO).
G54	Fixture Offset #1.
G55	Fixture Offset #2.
G56	Fixture Offset #3.
G57	Fixture Offset #4.
G58	Fixture Offset #5.
G59	Fixture Offset #6.
G80	Cancel drill cycle.
G81	Simple drill cycle.
G82	Simple drill cycle with dwell.
G83	Peck drill cycle.
G84	Tap cycle.
G90	Absolute coordinate programming mode.
G91	Incremental coordinate programming mode.
G98	Drill cycle return to Initial point (R).
G99	Drill cycle return to Reference plane (last Z Height)

Questions on CAD/CAM

All about CAD/CAM

COMPUTER-AIDED DESIGN (CAD) 

AND COMPUTER-AIDED MANUFACTURING (CAM)

Computer-aided design (CAD) and computer-aided manufacturing (CAM) are a pair of often interdependent industrial computer applications that have greatly influenced the chain of processes between the initial design and the final realization of a product. Many would add to this duo a third technology, computer-aided engineering (CAE). Ongoing refinements in CAD/CAM systems continue to save manufacturers tens of millions of dollars in time and resources over non-computerized methods. As a consequence, CAD and CAM technologies are responsible for massive gains in both productivity and quality, particularly since the 1980s. For some purposes CAD and CAM methods can be used exclusively of one another, and in general, CAD is used more commonly than CAM.

CAD involves creating computer models defined by geometrical parameters. These models typically appear on a computer monitor as a three-dimensional representation of a part or a system of parts, which can be readily altered by changing relevant parameters. CAD systems enable designers to view objects under a wide variety of representations and to test these objects by simulating real-world conditions.

CAM picks up where CAD leaves off by using geometrical design data to control automated machinery. CAM systems are associated with computer numerical control (CNC) or direct numerical control (DNC) systems. These systems differ from older forms of numerical control (NC) in that geometrical data is encoded mechanically. Since both CAD and CAM use computer-based methods for encoding geometrical data, it is possible for the processes of design and manufacture to be highly integrated.

Full forms

Meaning (Full Forms) of Automobile Technology -
CRDi - (Common Rail Direct Injection)
TDi - (Turbocharged Direct Injection)
DTS-i - (Digital Twin Spark Ignition)
VTVT - (Variable Timing Valve Train)
MPFI - (Multi point fuel injection)
ABS - (Anti Lock Braking)
SOHC - ( Single OverHead Camshaft)
DOHC - (Double Overhead Camshaft)
SUV - (Sport Utility Vehicle)
MUV - (Multi Utility Vehicle)
SAE - (Society of Automotive Engineers)
HCV - (Heavy Commercial Vehicle)
LCV - (Light Commercial Vehicle)
CVTi - (Charged motion Variable Time Ignition)
CCVTI - (Controlled Combustion Variable Timing Ignition)
EBD - (Electronic Brakeforce Distribution)
BHP - ( Brake Horse Power)
BMEP - (Brake Mean Effective Pressure)
BSFC - (Brake Specific Fuel Consumption
CC - (Cubic Capacity)
CDI - (Capacitor Discharge Ignition)
C.I ENGINE - (Compression Ignition Engine)
CNG - (Compressed Natural Gas)
DFI - (Digital Fuel Injection)
DI ENGINE - (Direct Injection Engine)
EC ENGINE - (External Combustion Engine)
FHP - (Frictional Horse Power)
GVW - (Gross Vehicle Weight)
HVAC - (Heating ventilating and Air Conditioning)
IC ENGINE - (Internal Combustion Engine)
IHP - (Indicated Horse Power)
IMEP - (Indicated Mean Effective Pressure)
ISFC - (Indicated Specific Fuel Consumption)
Kph - (Kilometer Per Hour)
Kpl - (Kilometer Per Liter)
OHV - (Over Head Valve)
SFC - (Specific Fuel Consumption)
SI ENGINE - (Spark Ignition Engine)
VDB - (Ventilated Disc Brake)
VVTi - (Variable Valve Timing intelligence)
4WD - (Four Wheel Drive(FWD))
2WD - (Two Wheel Drive)
TC - (Traction Control)
ESC -(Electronic Stability Control)
ARAI -(Automotive Research Association of India)
EGR -(Exhaust Gas Recirculation)
EVRV -(Electronic Vacuum Regulator Valve)
WGT -(Waste Gas Turbocharger)
VGT - Variable Geometry Turbocharger)

How to install NX-9.0

Hey guys here is the solution for most common problem with so many Mechanical engineers, installing the software.

I'm uploading a video which will let you know the procedure to install Unigraphics NX-9.0 in your pc or lapi.  

CAD/CAM/CAE

Today onward ill be adding some videos and other stuff that will help you learn CAD tools.