HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 123)

˜ ˜¢¬ 123
6.3 Cont
our Appr
oac
h
and Depar
tur
e
Example NC blocks
Departing on a straight line with tangential
connection: DEP LT
^F˜›ppd˜hp¦F’˜pm˜"˜’›"aV^›˜damF˜Oph˜›^F˜d"’›˜4pm›p¤˜zpam›˜ ˜›p˜›^F˜
Fm=˜zpam›˜ ˜^F˜damF˜daF’˜pm˜›^F˜F¨›Fm’apm˜pO˜›^F˜d"’›˜4pm›p¤˜
FdFhFm›˜ ˜a’˜’Fz""›F=˜Oph˜ ˜*©˜›^F˜=a’›"m4F˜ 
8 pV"h˜›^F˜d"’›˜4pm›p¤˜FdFhFm›˜§a›^˜›^F˜Fm=˜zpam›˜ ˜"m=˜"=a¤’˜
4phzFm’"›apm
8 ma›a"›F˜›^F˜=a"dpV˜§a›^˜›^F˜ — ˜cF©˜"m=˜ ˜˜’pO›˜cF©9
8 9˜ m›F˜›^F˜=a’›"m4F˜Oph˜›^F˜d"’›˜4pm›p¤˜FdFhFm›˜
˜›p˜›^F˜Fm=˜zpam›˜ 
Example NC blocks
Departing on a straight line perpendicular to the
last contour point: DEP LN
^F˜›ppd˜hp¦F’˜pm˜"˜’›"aV^›˜damF˜Oph˜›^F˜d"’›˜4pm›p¤˜zpam›˜ ˜›p˜›^F˜
Fm=˜zpam›˜ ˜^F˜damF˜=Fz"›’˜pm˜"˜zFzFm=a4¤d"˜z"›^˜Oph˜›^F˜d"’›˜
4pm›p¤˜zpam›˜ ˜ ˜a’˜’Fz""›F=˜Oph˜ ˜*©˜›^F˜=a’›"m4F˜ ˜zd¤’˜›^F˜
›ppd˜"=a¤’
8 pV"h˜›^F˜d"’›˜4pm›p¤˜FdFhFm›˜§a›^˜›^F˜Fm=˜zpam›˜ ˜"m=˜"=a¤’˜
4phzFm’"›apm
8 ma›a"›F˜›^F˜=a"dpV˜§a›^˜›^F˜ — ˜cF©˜"m=˜ ˜˜’pO›˜cF©9
8 9˜ m›F˜›^F˜=a’›"m4F˜Oph˜›^F˜d"’›˜4pm›p¤˜FdFhFm›˜
›p˜ 
d§"©’˜Fm›F˜ ˜"’˜"˜zp’a›a¦F˜¦"d¤FM
Example NC blocks
7 L X+40 Y+10 RO FMAX M3 zzp"4^˜ ˜§a›^p¤›˜"=a¤’˜4phzFm’"›apm
8 APPR LCT X+10 Y+20 Z-10 R10 RR F100 ˜§a›^˜"=a¤’˜4phz˜:˜"=a¤’˜Ks¬
9 L X+20 Y+35
m=˜zpam›˜pO˜›^F˜Oa’›˜4pm›p¤˜FdFhFm›
10 L ... F¨›˜4pm›p¤˜FdFhFm›
X
Y
20
P
E
RR
P
N
R0
RR
12.5
23 L Y+20 RR F100 "’›˜4pm›p¤˜FdFhFm›9˜ ˜§a›^˜"=a¤’˜4phzFm’"›apm
24 DEP LT LEN12.5 F100
Fz"›˜4pm›p¤˜*©˜ Ks¢Q˜hh
25 L Z+100 FMAX M2
F›"4›˜am˜!:˜F›¤m˜›p˜*dp4c˜s:˜Fm=˜zpV"h
X
Y
20
P
E
RR
P
N
R0
RR
20
23 L Y+20 RR F100 "’›˜4pm›p¤˜FdFhFm›9˜ ˜§a›^˜"=a¤’˜4phzFm’"›apm
24 DEP LN LEN+20 F100
Fz"›˜zFzFm=a4¤d"˜›p˜4pm›p¤˜*©˜ K¢¬˜hh
25 L Z+100 FMAX M2 F›"4›˜am˜!:˜F›¤m˜›p˜*dp4c˜s:˜Fm=˜zpV"h