8 Cycles
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8.2 Drilling Cycles
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BORING (Cycle 202)
Machine and corttrot must be speciatly preparezi by the machine taol builder to snnble Cycte 202.
Note:
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Program a pasitioning block for the starting pa& {hole cant&r) in the WA&‘@ p&3 with r&ius compensation RO.
* The algeb& sign for cy&i:le parameter DEPTH deffinesthe warking dirstion:
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‘Y
Process
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The TNC positions the tool in the Z axis at rapid traverse to the pro-
grammed setup clearance above the workpiece surface.
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The tool drills at the programmed drilling feed rate to the programmed
depth.
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The tool dwells at the bottom of the hole-if this has been specified-
to allow the spindle to free run.
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The TNC subsequently stops the tool with Ml 9 at the 0” position
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If retraction is selected, the TNC retracts in the programmed direction
by 0.2 mm (fixed value).
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The TNC subsequently moves the tool at the retraction feed rate to the
setup clearance and from there-if this has been specified-at FM/W
to the 2nd setup clearance.
Input data
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SET-UP CLEARANCE Q200 (incremental value):
Distance between tool tip and workpiece surface. Enter a positive
value.
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DEPTH Q201 (incremental value):
Distance between workpiece surface and bottom of hole. Enter a
negative value.
. FEED RATE FOR PECKING Q206:
Traversing speed of the tool boring in mm/min.
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DWELL TEVE AT DEPTH Q211:
Time in seconds which the tool spends at the bottom of the hole.
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RETRACTION FEED RATE 0208:
Traversing speed of the tool when withdrawing from the hole in mm/
min. If Q208=0 entered, then withdraw at BORING FEED RATE.
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WORKPIECE SURFACE COORDINATE 0203 (absolute value):
Coordinate of the workpiece surface.
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2ND SET-UP CLEARANCE Q204 (incremental value):
2 coordinate at which no collision between tool and workpiece (clamp-
ing devices) can occur. Enter a positive value.
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DISENGAGING DIRECTN (O/l/2/3/4) Q2 14:
Specify the direction in which the TNC retracts the tool at the bottom of
the hole (in accordance with spindle orientation).
Fig. 8.5:
Input parameters,
BORING
cycle
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Attanthtl
Danger cyf colliafon.
Check
the position of the ttrof
tip
if programming a spindle ori@%ation to O” (for
example, in
operating mc4e PDSI-
TIONINE WtTH MANUAL DATA INPUT). Align the toot rip so that it is paraltel to a coordinate
axis. Select the retrac-
tion direction so that the toot LOVES away from the edge of th# hole.
0: Do not retract tool
1: Retract tool in negative main axis direction
2: Retract tool in negative secondary axis direction
3: Retract tool in positive main axis direction
4: Retract tool in positive secondary axis direction
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TNC 370
8-9
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