Peck Tapping Cycle (G84 Or G74) - Siemens SINUMERIK 802D sl Programming Manual

Enhanced Level Commands
4.1 Program support functions (1)
4.1.13

Peck tapping cycle (G84 or G74)

Due to chips stuck to the tool or increased resistance to cutting, the tapping a deep
hole in rigid tapping mode could be difficult. The peck rigid tapping cycle is useful
when this is the case.
Cutting is carried out several times in this cycle until the bottom of the hole is
reached. For this, two peck tapping cycles are available: High--speed peck tapping
cycle (deep hole tapping with chip--breaking) as well as the standard peck tapping
cycle (deep hole tapping with swarf removal.
By using GUD7 and setting data _ZSFI[1], these cycles are selected as follows:
_ZSFI[1] = 2: High--speed peck tapping cycle
_ZSFI[1] = 3: Standard peck tapping cycle
Format
G84 (or G74) X... Y... Z... R... P... Q... F... K... ;
X,Y: Hole position
Z: Distance from point R to the bottom of the hole
R: The distance from the initial level to point R level
P: Dwell time at the bottom of the hole and at point R when a return is made
Q: Depth of cut for each cutting feed
F: The cutting feedrate
K: Number of repeats
Point R
q
q
q
Fig. 4-19
4-124
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition
G84, G74 (G98)
d = retraction distance
Initial level
(1)
d
(2)
Point Z
High--speed peck tapping cycle (GUD7 _ZSFI[1] = 2)
G84, G74 (G99)
Point R
q
q
d
q
© Siemens AG 2007 All rights reserved
04.07
(1)
d
(2)
d
Point Z