Fanuc G74 left hand peck tapping cycle program

What is tapping ?

       Tapping is operation of making internal threading in existing hole. It is similar to drilling process , only there is requirement of existing hole to perform the operation . friends here we see the fanuc G74 left hand peck tapping cycle . It is also known as reverse tapping cycle and counter tapping cycle.

Parameter of left hand peck tapping cycle :-

                   XY- XY position where operation will perform .

                   Z   - Operation perform depth .

                   Q  - Depth of each cut .

                   R  - R plane position .

                   F  - Cutting feed rate

G74 and G84 cycle are used for tapping operation but difference is G74 is used for left hand tapping and G84 is used for right hand tapping .

FEED RATE CALCULATION

                              F= RPM X Pitch

O4231

N10   M06 T07 ;
N20   G90 G80 G17 G00 G54 X20 Y20 ;
N30   G43 Z100 H11 ;
N40   M04 S1500 ;
N50   M08 ;
N60   G99 G74 Z-55 R5 Q20 F2.5 ;
N70   G98 G80 G00 Z100 ;
N80   M05 M09 M30 ;

                                                                                  More examples..........!!!!
DESCRIPTION OF PROGRAM

N10- Tool change command , select tool no. 7
N20- Absolute co-ordinate command , cancel canned cycle command , selection of  XY plane, rapid command, work coordinate for tool positioning at  X20 and Y20.
N30- Tool height offset compensation command , where tool is 100 along Z axis , tool hight code H11.
N40- Spindle on anti-clockwise ( for LH), speed is 1500 rpm .
N50- Coolant ON .
N60- Return to R-plane in canned cycle , left hand tapping cycle command , Depth of drill is 55 , R- plane distance is 5 , depth of each cut is 20(incremental), feed rate per minute is 2.5 .

Description of fig :-  when tapping operation start , tool is  perform first cut tapping operation up to Q1( each cut is 20 and it is incremental ) and return at R plane . After that it will take next cut up to Q2  and return at R plane . And it will take last cut up to Q3 and then tool return upto initial position .

N70- Tool is return at intial position , cancel canned cycle , rapid command where tool is 100 mm up along z axis.
N80- Spindle off , coolant off , main program end .