
Manual Guide M Cycle Programming
GE Fanuc Automation S.A. - 51 -
GFKE-0046-EN/01
3. 2. 6 Boring Cycle G87
(Back Boring)
The Back Boring cycle enable to bore a hole from the
backside.
By pushing [BACK], the following items are displayed
Z POINT DISTANCE
In the case G90 (Absolute = Default)
- the Z axis position of the bottom of the hole
In the case G91 (Incemental)
- the distance from point R to the bottom of the hole
R POINT DISTANCE
In the case G90 (Absolute = Default)
- the Z axis position of point R level
In the case G91 (Incemetnal)
- the distance from the initial level to point R level
TOOL SHIFT AMOUNT
Shift amount at top and at the bottom of the hole
DWELL TIME
Dwell time at the bottom of the hole
FEED RATE
Cutting feed rate for boring
Return to Initial level Return to R-level
Important note
Q
(Shift amount at the bottom of the hole) is a modal value,
retained within canned cycles. It must be specified
carefully, because it is also used as the depth of cut for
G83 and G73.
G87 (G99)
Not use
G87
G98
Point Z
Point R
P
OSS
S
indle
S
indle
OSS