Fixed cycle (Boring 7)

Q: What does Mazak G-code G89 do?

G89 — Fixed cycle (Boring 7) on the MAZATROL SmoothX control (INTEGREX e-670H). In an EIA/ISO program, synchronous tapping can be selected by additionally setting data at the address H in the tapping cycle block of G74 or G84. Address H is used to select between a syn- chronous and asynchronous tapping cycle and to designate the override of return speed. Special preparatory functions G84.2 and G84.3 are also provided for both types of synchronous tapping. Moreover, addresses Q and I are provided for specifying a deep-hole tapping and high-speed deep-hole tapping cycle. Arguments Q and I are used respectively to specify the depth of cut per pass for pecking and to select between a standard and high-speed deep-hole tapping cycle. 1. G74 [Reverse tapping]/G84.3 [Synchronous reverse tapping] Deep-hole tapping cycle High-speed deep-hole tapping cycle (Set the pitch for synchronous tapping) h

Machine-specific. This G-code reference is specific to the Mazak INTEGREX e-670H / e-670H-S with the MAZATROL SmoothX control (EIA/ISO programming manual H747PB0030E). G-code availability depends on fitted options, and groups and behaviour differ between Mazak models and control generations — verify against the manual for your own machine before programming with any code.

What it does

In an EIA/ISO program, synchronous tapping can be selected by additionally setting data at the address H in the tapping cycle block of G74 or G84. Address H is used to select between a syn- chronous and asynchronous tapping cycle and to designate the override of return speed. Special preparatory functions G84.2 and G84.3 are also provided for both types of synchronous tapping. Moreover, addresses Q and I are provided for specifying a deep-hole tapping and high-speed deep-hole tapping cycle. Arguments Q and I are used respectively to specify the depth of cut per pass for pecking and to select between a standard and high-speed deep-hole tapping cycle. 1. G74 [Reverse tapping]/G84.3 [Synchronous reverse tapping] Deep-hole tapping cycle High-speed deep-hole tapping cycle (Set the pitch for synchronous tapping) h  1 .... Synchronous tapping 1 ... High-speed deep-hole tapping cycle (b ) 2 ... M03 before dwell at hole bottom  X, Y, P, Q, I, J(B), D, H, and/or K can be omitted. If, however, J(B) is omitted or set to 0, the setting of J(B) will be regarded as 2. […]

G89 is modal (group 09) — it stays in effect until another code of the same group replaces it.

Programming format

G89 [Xx Yy] Rr Zz [Pt ]

Address words

t c : Dwell (in time or No. of revolutions)
t c : Dwell (always in time) d 0 : Distance from R-point (Tap lifting distance)
q 0 : Depth of cut per pass for pecking h 0 : Return speed override (%)
f 0 : Feed rate h 0 = 0 ..... Asynchronous tapping
i 0 : 0 ... Deep-hole tapping cycle k 0 : Distance from R-point
j : 1 ... M03 after dwell at hole bottom
Argument Q: Given Argument Q: Omitted (or Q0)

Source

Mazak PROGRAMMING MANUAL for EIA/ISO PROGRAM, manual H747PB0030E, section 13-1-20 G89 [Boring], p. 3-11, 13-20, 13-21. Reference and explanation only — not a reproduction of the manual.

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