8 Cycles
8.2 Drilling Cycles
d
TAPPING with a floating tap holder (Cycle 2)
NOW
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Program a positioning block far the
starting
point fhote centeit in thevv&&g plane with radius comprx&ion RO.
* Program a positioning block far the @tatting paint in the tool axis {setup clearance abdvfs the ~&piece surffacet.
* The algebraic sign for cycis parameter TAPPING DEPTH defines the working dire&xx
* A floating tap hoi&r is required far tapping. The ffoitting tap holder compensates ths tototerances for feed rate
and spindle speed during the tapping process.
+ When
a
~yclg is being run, the spin& swed override control is d&bled. The feed rats override contra1 is only
active within a fimited range (preset by tha machine
t#ol buitd&+
* for tapping
right-hand threads activate the spindfe v&h MS: for left-hanci threads use M4.
Process
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The thread is cut in one pass.
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When the tool reaches the total hole depth, the
direction of spindle rotation is reversed. After the
programmed dwell time the tool is retracted to
the starting position.
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At the starting position, the direction of rotation
is reversed once again.
1.
1
Input data
Fig. 8.7: TAPPING
cycle
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SET-UP CLEARANCE @ (incremental value):
Distance between tool tip (starting position) and workpiece surface.
Standard value: 4x thread pitch.
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TOTAL HOLE DEPTH @ (thread length, incremental value):
Distance between workpiece surface and end of thread
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DWELL TIMI3 IN SECONDS:
Enter a dwell time between 0 and 0.5 seconds to prevent wedging of
the tool when retracted.
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FEEDRATEF:
Traversing speed of the tool during tapping.
The feed rate is calculated as follows:
F = S-p
F: Feed rate (mm/min)
s: Spindle speed (rpm)
P:
Pitch (mm)
4
4
4
8-12 TNC 370 -
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