Fixed cycle (Boring 2)

Q: What does Mazak G-code G76 do?

G76 — Fixed cycle (Boring 2) on the MAZATROL SmoothX control (INTEGREX e-670H). (Direction determined by bits 3 & 4 of I14) (b ) Value except 0 ····· M04 after machining X, Y, P, Q, D, and/or J(B) can be omitted. Whether argument J or B is to be used depends on the value that has been set in bit 1 of Parameter F84 bit 1 = 1: Argument J-command (argument J-command), setting a B-command will cause the table to rotate. Be care- ful in that case to ensure no interference between the workpiece and the tool. Normally, asynchronous feed (G94) is used for the pass marked with (). If f = 0, or if f is omitted, however, synchronous feed (G95) is used (feed rate = 0.5 mm/rev). X, Y, P, Q, E, J (B), and/or D can be omitted. Whether argument J or B is to be used depends on the value that has been set in bit 1 of Parameter F84 bit 1 = 1: Argument J-command (argument J-command), setting a B-command wi

Q: What is the programming format of G76?

G76 [Xx Yy] Rr Zz [Pt Qq ] Ff [Dd Jj (Bb )]

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

(Direction determined by bits 3 & 4 of I14) (b ) Value except 0 ····· M04 after machining X, Y, P, Q, D, and/or J(B) can be omitted. Whether argument J or B is to be used depends on the value that has been set in bit 1 of Parameter F84 bit 1 = 1: Argument J-command (argument J-command), setting a B-command will cause the table to rotate. Be care- ful in that case to ensure no interference between the workpiece and the tool. Normally, asynchronous feed (G94) is used for the pass marked with (). If f = 0, or if f is omitted, however, synchronous feed (G95) is used (feed rate = 0.5 mm/rev). X, Y, P, Q, E, J (B), and/or D can be omitted. Whether argument J or B is to be used depends on the value that has been set in bit 1 of Parameter F84 bit 1 = 1: Argument J-command (argument J-command), setting a B-command will cause the table to rotate. Be careful in that case to ensure no interference between the workpiece and the tool. […]

G76 is modal (group 09) — it stays in effect until another code of the same group replaces it.

Programming format

G76 [Xx Yy] Rr Zz [Pt Qq ] Ff [Dd Jj (Bb )]

Address words

t c : Dwell (in time or No. of revolutions) f 1 : Feed rate
q 0 : Amount of relief on the XY-plane j 0 : 0 or omitted ········· M03 after machining
Note: For a horizontal machining center, if the value of bit 1 of parameter F84 is 1
t c : Dwell (in time or No. of revolutions) j 0 (b 0 ) : Output order of M03 and M04 at hole bottom.
t z : Distance from the initial point 0: M03, then M04 (for normal spindle rotation)
f 0 : Feed rate 0 1: M04, then M03 (for reverse spindle rotation)
f 1 : Feed rate 1 d 0 : Distance from point R’
Note: For a horizontal machining center, if the value of bit 1 of parameter F84 is 1

Notes & precautions

For a horizontal machining center, if the value of bit 1 of parameter F84 is 1

Source

Mazak PROGRAMMING MANUAL for EIA/ISO PROGRAM, manual H747PB0030E, section 13-1-8 G76 [Boring], p. 3-11, 13-11, 13-12. Reference and explanation only — not a reproduction of the manual.

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