Fanuc G71 G72 equivalent

More
21 Jun 2020 17:17 #172262 by rudydp
Replied by rudydp on topic 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.

Please Log in or Create an account to join the conversation.

More
24 Jun 2020 02:56 - 24 Jun 2020 16:41 #172528 by Barry
Replied by Barry on topic Fanuc G71 G72 equivalent
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.

This browser does not support PDFs. Please download the PDF to view it: Download PDF

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
Attachments:
Last edit: 24 Jun 2020 16:41 by Barry. Reason: I hit submit too soon. Added an attachment

Please Log in or Create an account to join the conversation.

More
28 Jan 2021 19:26 #196986 by tom-rock
Replied by tom-rock on topic Fanuc G71 G72 equivalent
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
Attachments:

Please Log in or Create an account to join the conversation.

More
29 Jan 2021 00:24 #197011 by andypugh
Replied by andypugh on topic Fanuc G71 G72 equivalent
Are you using the built-in G71 or the Python remap?

(At this point I would very much recommend the built-in version)

Please Log in or Create an account to join the conversation.

More
29 Jan 2021 13:23 #197060 by tom-rock
Replied by tom-rock on topic Fanuc G71 G72 equivalent
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

Please Log in or Create an account to join the conversation.

More
29 Jan 2021 13:51 #197061 by andypugh
Replied by andypugh on topic Fanuc G71 G72 equivalent
You can update to 2.7.14 on your existing OS and kernel, unless you are using something very old indeed.

Please Log in or Create an account to join the conversation.

More
29 Jan 2021 15:13 #197063 by tom-rock
Replied by tom-rock on topic Fanuc G71 G72 equivalent
Hi,

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

Thanks
Ralf

Please Log in or Create an account to join the conversation.

Time to create page: 0.272 seconds
Powered by Kunena Forum