33
G86
Cutting feed
SPDL STOP
Fast moving
Boring cycle
G87
Cutting feed
SPDL FWD
Fast moving
Back boring cycle
G89
Cutting feed
Time out
Cutting feed
Boring cycle
13.1 Fixed Loop Hole Processing
Generally, fixed loop hole processing usually consists of six action, as shown in Fig. 13-1.
Action 1: X, Y axis orientation, make knives rapid positioning to the machining position;
Action 2: move quickly to R point, cutting tool from the initial point quick feed to R point.
Action 3: hole processing, execute the hole in the way of cutting feed processing;
Action 4: action in the bottom of the hole, including suspension, warrant stop of spindle, cutter shift action;
Action 5: return R point, continue hole processing;
Action 6: a quick return to the initial point, hole processing generally should choose to return after the
completion of the initial point.
Fig. 13-1
1. The Initial Plane
The initial plane is stipulated for the safety of cutting. Initial plane distance on the surface of the parts can be
arbitrarily set in a safe value, the initial point of the plane is shown in Fig. 13-1. When using the same cutting tool
processing several holes, only the hole between the hurdles to jump or full hole processing is completed, just use
G98 functions make tool returns to the initial plane initial point, otherwise use G99to return to R point.
2. R Point
The plane "R" is also called R reference plane, the plane is the plane since the fast forward to work in. The
distance from the workpiece is considered by the dimension of main consideration the workpiece surface,
generally preferable 2
～
5mm. When using G99, the tool will return to the reference surface.
3
．
Flat Bottom of the Hole
In blind hole processing, the height of the plane is at the bottom of the bore hole at the bottom of the Z axis.
When machining hole general tool workpiece bottom plane distance and make sure all holes deep processing to
size. Pointed to the drilling process should also be considered a drill hole depth.
Command of spot facing cycle and planar selectively (G17,G18 or G19
）
is unrelated. No matter choose
which plane, spot facing work is in the XY plane positioning and drilling on the Z axis.
Specify a fixed cycle action sequence should consider three problems
：
1
）
coordinate data is absolute value or incremental value
；
2
）
Return point plane is choosing the plane initial point or the plane "R"
；
