Drilling cycle G83 or G87

Drilling cycle (G83 or G87):-

If depth of cut is not specified for each drilling, the normal drilling cycle is used.  The tool is then retracted from the bottom of the hole in rapid traverse.

Format:-

G83 X(U)_ C(H)_ Z(W)_ R_ P_ F_ K_ M_ ;

or

G87 Z(W)_ C(H)_ X(U)_ R_ P_ F_ K_ M_ ;

X_ C_ or Z_ C_  :  Hole position data

Z_ or X_   :  The distance from point R to the bottom of the hole

R_  :  The distance from the initial level to point R level

P_  :  Dwell time at the bottom of a hole

F_  :  Cutting feedrate

K_  :  Number of repeats (When it is needed.)

M_  :  M code for C–axis clamp (When it is needed.)Examples

Example:-

M51  ;                       Setting C–axis index mode ON

M3 S2000 ;               Rotating the drill

G00 X50.0 C0.0 ;       Positioning the drill along the X– and C–axes

G83 Z–40.0 R–5.0 P500 F5.0 M31 ;   Drilling hole 1

C90.0 M31 ;              Drilling hole 2

C180.0 M31 ;            Drilling hole 3

C270.0 M31 ;            Drilling hole 4

G80 M05 ;    Canceling the drilling cycle and stopping drill rotation

M50 ;                        Setting C–axis index mode off

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Canned Cycle For Drilling G80-G89

Canned Cycle For Drilling (G80 – G89):-

The canned cycle for drilling simplifies the program normally by directing the machining operation commanded with a few blocks, using one block including G code.

Canned cycle:-

        G80  =      Cancel

        G83  =      Front Drilling Cycle

        G84  =      Front Tapping Cycle

        G85  =      Front Boring Cycle

        G87  =      Side Drilling Cycle

        G88  =      Side Tapping Cycle

        G89  =      Side Boring Cycle

In general, the drilling cycle consists of the following six operation sequences.

Operation 1  = Positioning of X (Z) and C axis

Operation 2  = Rapid traverse up to point R level

Operation 3  = Hole machining

Operation 4  = Operation at the bottom of a hole

Operation 5   =  Retraction to point R level

Operation 6  = Rapid traverse up to the initial point

Notes:-

                                          i.    For the B or C G–code system, G90 or G91 can be used to select   an  incremental  or  absolute  command  for  hole position data (X, C or Z, C), the distance from point R to the bottom of the hole (Z or X), and the distance from the initial level to the point R level (R).

                                        ii.    In each canned cycle,R_ (distance between the initial level and point R) is always handled as a radius.Z_ or X_ (distance between point R and the bottom of the hole) is, however, handled either as a diameter or radius, depending on the specification.

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