even in blocks with out a cutting motion

performed, even in blocks with out a cutting motion Exact stop check provides


spe Drilling Machine for Plate busbar bending machine cial means to check a tool po si tion with the pro gram commands G09 (non-modal blocks), or


G61 (modal blocks) This state is not avail able on Fanuc 0


Ex am ple of Spe cial Tap ping Operation


busbar Machine


In Chap ter 8 (macro O8004) in tro duced a spe cial tap ping macro (or a tap ping macro as a cy cle)


Al though cor rect in prin ci ple, it did not pro vide built-in safety fea tures The macro re quired that


when pro cessed by the con trol sys tem all over rides must be set to 100% This re quire ment is dif fi –


cult to main tain and se ri ous ma chin ing prob lems could hap pen Us ing var i ous modes of the vari –


able set tings will dis able the feedhold, the feedrate over ride and the sin gle block modes If the


ex


act stop check should not be dis


abled, the macro def


i


ni


tions of the two vari


ables will be


#3003=1, and #3004=3 If the ex act stop check should be dis abled, the macro def i ni tions of the


two vari ables will be #3003=1, and #3004=7 See the above ta ble for de tails


As sys tem vari ables automatic punching machine #3003 and #3004 are of ten used for spe cial cy cles, for ex am ple, a cus –


tom cy cle for tap ping (de scribed later in the hand book) In this macro ex am ple, we want to sim u –


late the ef fect of the G84 fixed cy cle, ex cept the cut ting feedrate on the way in will be 80% of the


given feedrate and on the way out 120% of the given feedrate The tap ping macro will be called at


the cur rent X and Y tool lo ca tion


u


Macro call (in English units):


First, the G65 block has to be de fined with all re quired ar gu ments and their as sign ments:


G65 P8020 R035 Z115 S750 T36


+


where 锟?


R = (#18) R-level clearance equivalent


Z = (#26) Z-depth


S = (#19) Spindle speed (r/min)


T = (#20) Number of threads per inch (TPI)


Other ar gu ments could be added, for ex am ple, cal cu la tion of the tap ping depth, au to matic cal –


cu la tion of the top clear ance (known as the R-level in G84 cy cle), etc For the pur pose

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