Lesson-4: Address Characters:

Address Characters:

Alphabet	Meaning / Used in
A	Angle
F	Feed function( mm/revolution)
N	Sequence number / block number
O	Program number/address
R	Radius
S	Speed in RPM (revolution/minute)
T	Tool number
U	Incremental in X axis
W	Incremental in Z axis
P, U, X	Designation of dwell time
G	Preparatory function - Specifies a motion mode (Linear, arc, etc)
M	Auxiliary function -Command of on/off for operating parts of machine
L	Sub program repetition count

Lesson-3 : CNC Turning - Axis Nomenclature

Number of axes:

            The most common distinction of different CNC lathes is by the number of programmable axes. A typical CNC lathes have two standard axes – one axis is the ‘X’ axis, other axis is the ‘Z’ axis. The X-axis also represents the cross travel of the cutting tool, the Z-axis represents its longitudinal motion.

                        X – Diameter

                        Z – Length

Lesson-2 : Incremental method

2) Incremental Method
         In Incremental method we must calculate values from the previous point.
Assume that we are calculating values in counter clock wise direction. so for point 2 we take point 1 as a ref. point. for point 3 we take point 2 as a ref. point.

Lesson-1 : Fanuc control- Absolute method

Now we are going to see Fanuc control programming for CNC Turning machines.

There are two methods we can use for writing a CNC program.
1) Absolute Method 2) Incremental Method.

1) Absolute Method

      In Absolute method we should calculate values from the reference point.

About CNC Machines

Dear friends,

   " பல்லவை கற்றும் பயமிலரே நல்லவையுள்
நன்கு செலச்சொல்லா தார்"

                                               - திருவள்ளுவர்

    " Though many things they've learned, yet useless are they all,
To man who cannot well and strongly speak in council hall"

                                                 

                                                - Thiruvalluvar

      CNC is the short form of Computer Numerical Control. In CNC Machines a mini computer controls the machine using numbers and codes.In 1950 JOHN T.Parsons and Frank L.Stulen developed CNC machines with their team.After many developments now we have advanced CNC machines in all the industries.

      There are so many types of CNC machines. In that CNC Turning and Milling machines are mostly used in Automobile industries.

      Types of CNC Machines:

      CNC Turning (Lathe/VTL)

      CNC Milling (VMC/HMC)

      CNC Wirecut

      CNC Grinding

      CNC Laser Cutting

      CNC Plasma Cutting

      CNC Routers

      CNC Drilling and Tapping

      CNC winding 

      etc...

      Types of Controls:

      Fanuc

      Siemens

      Mazatrol (Mazak)

      Mitsubishi

      Hurco

      Heidenhein

      etc...