HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 121)

˜ ˜¢¬ 121
6.3 Cont
our Appr
oac
h
and Depar
tur
e
Approaching on a straight line with tangential
connection: APPR LT
^F˜›ppd˜hp¦F’˜pm˜"˜’›"aV^›˜damF˜Oph˜›^F˜’›"›amV˜zpam›˜ ˜›p˜"m˜
"¤¨ada"©˜zpam›˜ ˜›˜›^Fm˜hp¦F’˜›p˜›^F˜Oa’›˜4pm›p¤˜zpam›˜ ˜pm˜"˜
’›"aV^›˜damF˜›^"›˜4pmmF4›’˜›"mVFm›a"dd©˜›p˜›^F˜4pm›p¤˜^F˜"¤¨ada"©˜
zpam›˜ ˜a’˜’Fz""›F=˜Oph˜›^F˜Oa’›˜4pm›p¤˜zpam›˜ ˜*©˜›^F˜=a’›"m4F˜

8 ’F˜"m©˜z"›^˜O¤m4›apm˜›p˜"zzp"4^˜›^F˜’›"›amV˜zpam›˜ 
8 ma›a"›F˜›^F˜=a"dpV˜§a›^˜›^F˜ — ˜cF©˜"m=˜ ˜˜’pO›˜cF©9
8 pp=am"›F’˜pO˜›^F˜Oa’›˜4pm›p¤˜zpam›˜
8 9˜ a’›"m4F˜Oph˜›^F˜"¤¨ada"©˜zpam›˜ ˜›p˜›^F˜Oa’›˜
4pm›p¤˜zpam›˜
8 "=a¤’˜4phzFm’"›apm˜—˜Op˜h"4^amamV
Example NC blocks
Approaching on a straight line perpendicular to
the first contour point: APPR LN
^F˜›ppd˜hp¦F’˜pm˜"˜’›"aV^›˜damF˜Oph˜›^F˜’›"›amV˜zpam›˜ ˜›p˜"m˜
"¤¨ada"©˜zpam›˜ ˜›˜›^Fm˜hp¦F’˜›p˜›^F˜Oa’›˜4pm›p¤˜zpam›˜ ˜pm˜"˜
’›"aV^›˜damF˜zFzFm=a4¤d"˜›p˜›^F˜Oa’›˜4pm›p¤˜FdFhFm›˜^F˜"¤¨ada"©˜
zpam›˜ ˜a’˜’Fz""›F=˜*©˜›^F˜=a’›"m4F˜ ˜zd¤’˜›^F˜›ppd˜"=a¤’˜Oph˜›^F˜
Oa’›˜4pm›p¤˜zpam›˜ ˜
8 ’F˜"m©˜z"›^˜O¤m4›apm˜›p˜"zzp"4^˜›^F˜’›"›amV˜zpam›˜ 
8 ma›a"›F˜›^F˜=a"dpV˜§a›^˜›^F˜ — ˜cF©˜"m=˜ ˜˜’pO›˜cF©9
8 pp=am"›F’˜pO˜›^F˜Oa’›˜4pm›p¤˜zpam›˜
8 FmV›^9˜ a’›"m4F˜›p˜›^F˜"¤¨ada"©˜zpam›˜ ˜ d§"©’˜
Fm›F˜ ˜"’˜"˜zp’a›a¦F˜¦"d¤FM
8 "=a¤’˜4phzFm’"›apm˜—˜Op˜h"4^amamV
Example NC blocks
X
Y
20
10
20
P
A
RR
P
S
R0
15
P
H
RR
RR
40
35
35
7 L X+40 Y+10 RO FMAX M3
zzp"4^˜ ˜§a›^p¤›˜"=a¤’˜4phzFm’"›apm
8 APPR LT X+20 Y+20 Z-10 LEN15 RR F100 ˜§a›^˜"=a¤’˜4phz˜:˜=a’›"m4F˜ ˜›p˜ 9˜ KsQ
9 L Y+35 Y+35
m=˜zpam›˜pO˜›^F˜Oa’›˜4pm›p¤˜FdFhFm›
10 L ... F¨›˜4pm›p¤˜FdFhFm›
X
Y
10
10
20
P
A
RR
P
S
R0
P
H
RR
RR
40
15
35
20
7 L X+40 Y+10 RO FMAX M3
zzp"4^˜ ˜§a›^p¤›˜"=a¤’˜4phzFm’"›apm
8 APPR LN X+10 Y+20 Z-10 LEN15 RR F100 ˜§a›^˜"=a¤’˜4phz˜
9 L X+20 Y+35
m=˜zpam›˜pO˜›^F˜Oa’›˜4pm›p¤˜FdFhFm›
10 L ... F¨›˜4pm›p¤˜FdFhFm›