Reciprocal Feed - YASKAWA yasnac i80m Instruction Manual

2.13
PROGRAM SUPPORT FUNCTIONS (Cont'd)
(b)
Two-step feed*
In drilling operation, if the cutting speed in the vicinity
of drill
start
is slowed down, the
accuracy
of hole
position can be increased without
performing
center
hole machining.
QL
INITIAL POINT
T
R-
POINT
hiiO
:
F FEED
Z- POINT
Address
E: Speed in
1st
step
Address
tj:
Distance
for 1st
step
speedtemmanded without
a situii
Fig.2.13.4
(c)
Reciprocal feed*
Cutting speeds in forward and
return
can be separately
commanded such
as in tapping or boring operations. In
tapping operations, machining can be completed before the
tap
is fully
extended.
Furthermore, the machining time in boring operations can
be reduced.
In reaming operations, possible damage
to
the
machined surface
in the
return process can
be prevented.
Q
INITIAL POINT
R-POINT
F KF.FD
E FEED
Z-POINT
Address E: Return speed
Fig.2.13.5
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172
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