Fanuc G71 G72 equivalent

In master there seems to be a problem when using G71. When running the demo profile and stopping the program while running, eg. to edit the program and change some parameter, and then reloading, an error in the gcode is given. The only way out seems to be to restart axis.

Does anyone know how to correct what appears to be a coding error for G72?

Per the information on this G-Code, "G72 works identically to the G71 cycle except that the axes used for feed and cut are swapped as are the effects of K& I and L&J." So therefore, Parameter L should control the amount of extra material left in the radial direction during rough cuts prior to the finishing passes, and it does, so Parameter L works properly. Whereas Parameter J should control the amount of extra material left in the axial direction during rough cuts prior to the finishing passes. However, instead it shifts the entire cut by the input value. The attached document shows the issue visually. Parameters I & K do not appear to control anything but I think this is due to incomplete code and not a coding error.

G71 appears to work correctly. Parameter J leaves material in radial direction and Parameter L leaves material in the axial direction prior to the finishing pass. Parameters I & K do not appear to control anything but I think this is due to incomplete code and not a coding error.

Thank you,

Barry

Hi,

first of all I want to thank andypugh for his fantastic work on G71/G72 and all other things.

I have similar problems:

J works correct
L only accepts integer (no decimal like 0.2) but even with integer it has no effect
I and K have no effect

G71 works with G7 and G8 correct but G72 only works in G8 and makes errors with G7(diameter mode).

What is the meaning of argument Q which andy used in his examples in the G71/G72 line? I cant notice any effect?

I use 2.7.14 and I am very happy with the G71/G72 remap but would like to use G72 in G7(diameter mode).

Has anybody an idea why G72 does not work in G7?

Thanks for your attention

Ralf




Code:
G18 G21 G7
T01 M06 G43
S2000 M03
G0 X25 Z1.0
G72 P100 D1 F300 J0.9 L1 I1 K1
O100 SUB
G0 X25 Z-30
G1 X18 Z-20
G1 Z-10
G1 X10
G1 Z-5
O100 ENDSUB
G0 Z1
G0 X26
O100 CALL
G0 Z1
G0 X26
M2



Code:
G18 G21 G7
T01 M06 G43
S2000 M03
G0 X25 Z1.0
G72 P100 D1 F300 J0.9 L1 I1 K1
O100 SUB
G0 X25 Z-30
G1 X10
G1 Z-10
G1 X1
G1 Z-5
O100 ENDSUB
G0 Z1
G0 X26
O100 CALL
G0 Z1
G0 X26
M2

I am using the remap with 2.7.14.

Because of the new realtime kernel I want to stay on the old version till I purchase a mesa card.

Thanks

Ralf

Hi,

I have already 2.7.14 and dont want to upgrade to 2.9.

Thanks
Ralf