This partiular section does not really belong to the chapter

 Setting This partiular section does not really belong to the chapter dealing Drilling Machine for Plate with tool off sets, but it is in –


cluded here as a re minder of the tool off sets used in pro gram ming of a typ i cal CNC lathe


In a typ i cal pro gram for a CNC lathe, the cut ting tool is called with the T-ad dress, fol lowed by a


four digit num ber, for ex am ple T0101 There is no M06 func tion for an au to matic tool change on

drill Machine


the lathe, the T-ad dress does the tool change (tool in dex ing) as well as set ting the off set val ues


The four digit num ber is, in fact, two pairs of two digit num bers The first pair al ways calls the


tool num ber sta tion on the tur ret, the sec ond pair is the off set num ber So T0101 means tool 1,


off set 1 With mem ory Type A, there is only a sin gle set of vari ables, and they re fer to the Wear


off set only There is no Ge om e try off set in Type A In the pro gram, it could be the G50 com mand that sets the ge om e try off set (G50 on lathes is equiv a lent to G92 on mills) Since this method of


set ting is to day con sid ered ob so lete, it is the Type B that is more com mon and pop u lar, us ing the


Ge om e try and the Wear Dished Head Punching Machine off sets In this case, the first pair of dig its in T0101 means se lec tion of the


tool sta tion num ber 1 on the tur ret (in clud ing the tool change) and the Ge om e try off set num ber, in


this ex am ple, also 1 The sec ond pair is strictly as signed to the Wear off set and does not have to be the same as the Ge om e try off set, al though of ten is


Al though there are CNC lathe op er a tors who to tally ig nore the Ge om e try/Wear off set dis tinc –


tion in the con trol and use only the Ge om e try off set, it is def i nitely not the rec om mended ap –


proach, Angle Punching def i nitely for macro pro grams For ex am ple, if the mea sured Ge om e try off set en try for


T0101 is Z-3750 and the Wear off set for the same tool is Z15, it is ex actly the same as hav ing


the Ge om e try off set set to Z-3735, and the Wear off set set to Z00 Not the right ap proach

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