2. FUNCTION TO SIMPLIFY
(For the Power Mate i–D/D2)
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.
G76 X_ Z_ R_ Q_ P_ F_ ;
X_ : 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
Q_ : Shift amount at the bottom of a hole
P_ : Dwell time at the bottom of a hole
F_ : Cutting feedrate
Shift amount q
Oriented spindle stop
Q (shift at the bottom of a 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 G73 and G83.
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.
Before specifying G76, use a miscellaneous function (M code) to rotate
When the G76 command and an M code are specified in the same block,
the M code is executed at the time of the first positioning operation. The
system then proceeds to the next operation.
When a tool length offset (G43, G44, or G49) is specified in the canned
cycle, the offset is applied at the time of positioning to point R.
Fine Boring Cycle