Fanuc Series 15i/150i-MA (Programming) Operators Manual

13.FUNCTIONS TO SIMPLIFY PROGRAMMING PROGRAMMING B-63324EN/03
- 292 -
13.1.3 Fine Boring Cycle (G76)
The fine boring cycle bores a hole precisely.
When the bottom of the hole has been reached, the spindle stops, and
the tool is moved away from the machined surface of the workpiece and
retracted.
Format
G76(G98) G76(G99)
G76 X_ Y_ Z_ R_ I_ J_ P_ F_ L_ ;(When the parameter SIJ (No. 6200#2) is 1)
or
G76 X_ Y_ Z_ R_ Q_ P_ F_ L_ ;(When the parameter SIJ (No. 6200#2) is 0)
X_ Y_ : Hole position data
Z_ : The distance from point R to the bottom of the hole
R_ : The distance from the initial level to point R level
I_ J_ : Shift amount at the bottom of a hole
Q_ : Shift amount at the bottom of a hole
P_ : Dwell time at the bottom of a hole
F_ : Cutting feedrate
L_ : Number of repeats (if required)
Spindle CW
Initial level
Point R
Point Z
q
P
Spindle CW
Point R level
Point Z
q
P
Point R
OSS
OSS
Shift amount q
Oriented spindle stop
Tool
Explanation
- Operation
When the bottom of the hole has been reached, the spindle is stopped at
the fixed rotation position, and the tool is moved in the direction
opposite to the tool tip and retracted. This ensures that the machined
surface is not damaged and enables precise and efficient boring to be
performed.
- Spindle rotation
Before specifying G76, use a miscellaneous function (M code) to rotate
the spindle.

Leave a Reply

Your email address will not be published. Required fields are marked *