Fixed cycle (High-speed deep-hole drilling)

Q: What does Mazak G-code G73 do?

G73 — Fixed cycle (High-speed deep-hole drilling) on the MAZATROL SmoothX control (INTEGREX e-670H). The feed rate will remain unchanged if either I or J(B) is omitted. X, Y, P, D, K, I, and/or J(B) can be omitted. If D is omitted or set to 0, the machine operates according to the value of parameter F12. The alarm 809 ILLEGAL NUMBER INPUT will occur if Q is set to 0. 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. The feed rate is f only if the starting point of a cutting pass is within the range of i . return point [1] falls outside the range of feed override distance i , feeding does not decelerate and cutting is performed at feed rate f ; durin

Q: What is the programming format of G73?

G73 [Xx Yy] Rr Zz Qt [Pt ] Ff [Dd Kk Ii 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

The feed rate will remain unchanged if either I or J(B) is omitted. X, Y, P, D, K, I, and/or J(B) can be omitted. If D is omitted or set to 0, the machine operates according to the value of parameter F12. The alarm 809 ILLEGAL NUMBER INPUT will occur if Q is set to 0. 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. The feed rate is f only if the starting point of a cutting pass is within the range of i . return point [1] falls outside the range of feed override distance i , feeding does not decelerate and cutting is performed at feed rate f ; during the third cutting operation, since pecking return point [2] falls within the range of i , feeding decelerates and cutting is performed at feed rate f . c the return speed override (%) for synchronous (b ) 2...M03 before dwell at hole bottom 0 X, Y, P, J(B), D, H, and/or K can be omitted. […]

G73 is modal (group 09) — it stays in effect until another code of the same group replaces it.

Programming format

G73 [Xx Yy] Rr Zz Qt [Pt ] Ff [Dd Kk Ii Jj (Bb )]

Address words

t : Depth of cut per pass j : Feed override ratio (%)
t : Dwell (in time or No. of revolutions) (b)
d : Return distance f : Feed rate
k : Distance from R-point to the starting f : Feed overridden f = f×j(b)/100
point of cutting feed f : Return speed (fixed)
i : Feed override distance Max. speed: 9999 mm/min (for metric spec.)
Note: For a horizontal machining center, if the value of bit 1 of parameter F84 is 1
Example: In the diagram shown above, during the second cutting operation, since pecking
t : Dwell (always in time) h 0 : Flag for synchronous/asynchronous tapping and
f 0 : Feed rate
j : 1...M03 after dwell at hole bottom

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 13-1-5 G73 [High-speed deep-hole drilling], p. 3-11, 13-8, 13-9. Reference and explanation only — not a reproduction of the manual.

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