G7 and G8 don't seem to change how the paths are read

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25 Apr 2019 21:47 #131894 by Vitran
I am using BobCAD on a lathe. I tried to run code and noticed it was producing a diameter, not a radius, for the X value. When I was using CamBam before I changed it so X was 1/2 the diameter.

I found in the post processor how to change it from radius to diameter. It changed the G8 to a G7 at the start. With that change in the code, no difference. When I loaded it back into LinuxCNC it produced the same path lines with the radius=diameter.

I can go into MDI mode and do G7 G0X1 and G8 G0X1 and see it moving to 1" diameter and 1" radius. However not in the code. Changing the G7 and G8 at the start of the code does not change the paths on the screen. It will not let me start the code as it sees an arc with an excessive radius error.

Any ideas what I am missing?

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26 Apr 2019 00:04 #131905 by Todd Zuercher
Posting the beginning of the gcode file would be helpful diagnosing your problem.

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26 Apr 2019 01:03 - 26 Apr 2019 01:04 #131912 by Vitran
I found the solution about an hour after I posted. Not really a solution, but here.

This is the start of the code that failed.
G20
G64 G40 G18 G7 G95
(TOOL #5    TRIANGLE FACE)
T05 M6 G43
G90 S500 M3
G00 X.71 Z1.125
M8
G00 Z.325
G00 Z.075
G01 X.51 F.015
G01 X0.
G01 Z.125
G01 X.1414 Z.1957
G00 X.71
G00 Z.025
G01 X.51
G00 X.931
G00 X.431
G01 Z.125 F.015
G01 Z-1.2726
G03 X.5156 Z-1.3125 I-.0247 K-.0555
G01 X.531

The code above would always have X value in terms of diameter instead of radius. It would fault on the G03 line as shown (I did truncate some of the code). What I changed was make the post processor export the G03 as a radius, or X,Z,R and that made the lines work in terms of radius instead of diameter.

Below are the two complete codes. The first did not work, the second did.
My Drive
G20
G64 G40 G18 G7 G95
(TOOL #5    TRIANGLE FACE)
T05 M6 G43
G90 S500 M3
G00 X.71 Z1.125
M8
G00 Z.325
G00 Z.075
G01 X.51 F.015
G01 X0.
G01 Z.125
G01 X.1414 Z.1957
G00 X.71
G00 Z.025
G01 X.51
G01 X0.
G01 Z.075
G01 X.1414 Z.1457
G00 X.71
G00 Z-.025
G01 X.51
G01 X0.
G01 Z.025
G01 X.1414 Z.0957
G00 X.71
G00 Z-.026
G01 X.51
G01 X0.
G01 Z-.025
G01 X.1414 Z.0457
G00 Z.325
G00 Z5.
G00 X0.
G00 X.71
Z1.125
G00 Z.325
G00 Z-.0362
G01 X.51 F.015
G01 X0.
G01 Z.125
G01 X.1414 Z.1957
G00 Z.325
G00 Z0.
G00 X10.
G00 X2.51
Z.225
G00 X.931
G00 X.431
G01 Z.125 F.015
G01 Z-1.2726
G03 X.5156 Z-1.3125 I-.0247 K-.0555
G01 X.531
G01 X.6724 Z-1.2418
G00 Z.225
G00 X.331
G01 Z.125
G01 Z-.0529
G01 X.376 Z-.0754
G03 X.391 Z-.0935 I-.0362 K-.0181
G01 Z-1.2713
G01 X.4063
G03 X.431 Z-1.2726 I0. K-.0569
G01 X.5724 Z-1.2019
G00 Z.225
G00 X.2632
G01 Z.125
G01 Z-.019
G01 X.331 Z-.0529
G01 X.4724 Z.0178
G00 X.931
G00 Z5.
G00 X0.
G00 X2.51
Z.225
G00 X.8947
G00 X.2344
G01 Z.125 F.015
G01 Z-.0188
G01 X.2785 Z-.0408
G01 X.3619 Z-.0825
G03 X.371 Z-.0935 I-.0221 K-.011
G01 Z-1.2813
G01 X.4063
G03 X.4947 Z-1.3125 I0. K-.0469
G01 X.6361 Z-1.2418
G00 X.8947
G00 X10.
G00 Z0.
M5
M9
M1

G8
G0 X3
G0 Z4
M5

(thread)
t3 m6
g43
s600 m3
g4p1
g0z.2x.1970
g76 p.0625 z-1.0 i-.0025 j.008 k.05 h3 r2.0 q29.5 e.07 
g0x3
g0z4
m5
M30
My Drive
G20
G64 G40 G18 G7 G95
(TOOL #5    TRIANGLE FACE)
T05 M6 G43
G90 S500 M3
G00 X.71 Z1.125
M8
G00 Z.325
G00 Z.075
G01 X.51 F.015
G01 X0.
G01 Z.125
G01 X.1414 Z.1957
G00 X.71
G00 Z.025
G01 X.51
G01 X0.
G01 Z.075
G01 X.1414 Z.1457
G00 X.71
G00 Z-.025
G01 X.51
G01 X0.
G01 Z.025
G01 X.1414 Z.0957
G00 X.71
G00 Z-.026
G01 X.51
G01 X0.
G01 Z-.025
G01 X.1414 Z.0457
G00 Z.325
G00 Z5.
G00 X0.
G00 X.71
Z1.125
G00 Z.325
G00 Z-.0362
G01 X.51 F.015
G01 X0.
G01 Z.125
G01 X.1414 Z.1957
G00 Z.325
G00 Z0.
G00 X10.
G00 X2.51
Z.225
G00 X.931
G00 X.431
G01 Z.125 F.015
G01 Z-1.2726
G03 X.5156 Z-1.3125 R.0568
G01 X.531
G01 X.6724 Z-1.2418
G00 Z.225
G00 X.331
G01 Z.125
G01 Z-.0529
G01 X.376 Z-.0754
G03 X.391 Z-.0935 R.0256
G01 Z-1.2713
G01 X.4063
G03 X.431 Z-1.2726 R.0569
G01 X.5724 Z-1.2019
G00 Z.225
G00 X.2632
G01 Z.125
G01 Z-.019
G01 X.331 Z-.0529
G01 X.4724 Z.0178
G00 X.931
G00 Z5.
G00 X0.
G00 X2.51
Z.225
G00 X.8947
G00 X.2344
G01 Z.125 F.015
G01 Z-.0188
G01 X.2785 Z-.0408
G01 X.3619 Z-.0825
G03 X.371 Z-.0935 R.0156
G01 Z-1.2813
G01 X.4063
G03 X.4947 Z-1.3125 R.0469
G01 X.6361 Z-1.2418
G00 X.8947
G00 X10.
G00 Z0.
M5
M9
M1


G8
G0 X3
G0 Z4
M5

(thread)
t3 m6
g43
s600 m3
g4p1
g0z.2x.1970

g76 p.0625 z-1.0 i-.0025 j.008 k.05 h3 r2.0 q29.5 e.07 
g0x3
g0z4
m5
M30
Last edit: 26 Apr 2019 01:04 by Vitran.

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