G78 FANUC THREADING CYCLE PROGRAM FOR LATHE CNC EXAMPLE

                            Friends , G76 and G78(G code system B) are similar threading cycle in fanuc contol cnc . Sometimes some fanuc control cnc model working with G78 Cycle . Mostly used for threading  cycle is G76 , behaves same as G78 threading cycle. Manin program will be same , change is only is place of G76 .

N10 M06 T01 01 ;
N20 M04 G97 S1000 ;
N30 G00 X45 Z5 ;
N40 G78 P020060 Q100 R50 ;
N50 G78 X38.7 Z-50 P1227 Q100 F2 ;
N60 G00 X45 Z5 ;
N70 M05 M09 M30 ;

DESCRIPTION OF MAIN PROGRAM :-

N10- Tool change command , select tool no. 1
N20- Spindle ON anti clockwise , constant spindle speed command , speed is 1000 rpm
N30- Rapid action command where X45 and Z5 .
N40- Threading cycle command , P020060
                                                    ( P02 = No. of finished path
                                                     00  = Chamfer amount at end
                                                     60 = Angle of tool tip ) ,
                                                     Q100 = Each cut is 0.1 mm ,
                                                      R20 = finishing allowance 0.02mm
N50- Threading cycle command , Minor dia X axis , threading along Z- axis up to -50 , Threading depth , Depth of finish cut 0.1 mm , pitch is 2 .

: M40X2   

Major diameter is 40 

Pitch is 2 

Thread depth calculation = Pitch x 0.61363

                                       =  2 x 0.61363

                                               =  1.227 mm in micron is 1227

        

Minor diameter =  40-1.23 = 38.7  mm       

                                            
N60- Rapid action command where X45 and Z5 .
N70- Spindle off , coolant off , main program end .

                                                                                                       More examples..........!!!!