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Fanuc 31i B5 control / arc issue...


Niezingerly
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Well, new machine, Quaser MF500u in shop.

 

Fanuc 31i B5 control.  Humongous screen.  Love it compared to our other "dinky" 31i A5 screens on our Roku machines....

 

Actually a really nice machine, but no State-side Applications Engineers...

 

Crazy...

 

 

 

Ran a line of code, to cut a full circle.  Cut fine, except that the hole produced is too small, by .008" per side.

 

Hole is round within .0005", but too small...

 

No G41 in code, No value in Diameter offset in machine control.

 

G40 is executed at beginning of program, to cancel any cutter comp...

 

Checked cutter diameter, over and over.  Spot on 1/4" End mill (maybe off by .0005" per side, but not .008" per side, for sure...)

 

Cutter is a Bull nose, yes, but straight diameter of cutter is doing the cutting, in this case...

 

Was programmed using 2D Swept, X9.  Not neccesarily what I would have used, but so what.    Not certain how that might affect things, but???

 

Hole is modeled in Mastercam as a 0.343" diameter.

 

2D Swept Operation has -.0005 stock to leave.

 

0.343" diameter / 2 = .1715" hole radius      0.1715" - 0.125" cutter radius = 0.0465"       0.0465" +.0005" stock t leave  = .047"

 

IJ value should be 0.047"...

 

CAMplete outputs J value to be -.047"...

 

 

 

Output I am getting from post (CAMplete) gives me (1) line of code, to do a full 360 degree circle.

 

If I manually break the arc into 4 quadrants, same exact IJ values, hole comes out on size.

 

Totally confused.

 

 

 

Code below cuts hole using (1) line of code...(Original CAMplete output)

 

%
O1001 (O1001)
(Generation Date = Tuesday November 10, 2015 Time = 09:21:27 AM)
(Machining Setup = Quaser MF500u - Fanuc 31iMB - No Fixturing)
(NC Format = Quaser - Fanuc 31i - [ G68.2 / G43.4])
(T3  ,Gauge Length=4.219 in,Stickout Length=1.219 in)
(G54 X, Y, and Z Machine Coords: X: 0 in   Y: 0 in   Z: -13.2951 in)
G00 G17 G40 G80 G90 G94 G98
G49
G49 G53 Z0.0 M05
G69
(Cutting Tool = T3: 1/4 EM WITH .02 RAD - Bullnose 0.25-0.02 in)
T3 M06
G49 G53 Z0.0
M01
(O1000)
S3820 M03
G00 G90 G54 X0.0 Y0.0 A0.0 C0.0
G43 Z3.0000 H3
G01 X2.6181 Y1.4053
Z1.65 F60.0
G03 X2.6181 Y1.4053 I0.0 J-0.047 F30.0
G01 Z5.0 F60.0
G00 G90
G69
G49 G53 Z0.0
M05
M09
T1
M30
%

 

 

Code below here cuts hole using 4 lines of code: (Hand edit I did)

(Drew up the arc / circle in Mastercam, in the exact position in X / Y, got the coordinates for the quadrants, manually edited the code...)

 

 

%
O1099 (O1099)
(Generation Date = Tuesday November 10, 2015 Time = 09:21:27 AM)
(Machining Setup = Quaser MF500u - Fanuc 31iMB - No Fixturing)
(NC Format = Quaser - Fanuc 31i - [ G68.2 / G43.4])
(T3  ,Gauge Length=4.219 in,Stickout Length=1.219 in)
(G54 X, Y, and Z Machine Coords: X: 0 in   Y: 0 in   Z: -13.2951 in)
G00 G17 G40 G80 G90 G94 G98
G49
G49 G53 Z0.0 M05
G69
(Cutting Tool = T3: 1/4 EM WITH .02 RAD - Bullnose 0.25-0.02 in)
T3 M06
G49 G53 Z0.0
M01
(O1000)
S3820 M03
G00 G90 G54 X0.0 Y0.0 A0.0 C0.0
G43 Z3.0000 H3
G01 X2.6181 Y1.4053
Z1.65 F60.0
G03 X2.5711 Y1.3583 I0.0 J-0.047 F30.0
G03 X2.6181 Y1.3113 I0.047 J0.0 F30.0
G03 X2.6651 Y1.3583 I0.0 J0.047 F30.0
G03 X2.6181 Y1.4053 I-0.047 J0.0 F30.0

G01 Z5.0 F60.0
G00 G90
G69
G49 G53 Z0.0
M05
M09
T1
M30
%

 

 

 

Probably some parameter on the machine, but it just blows my mind.

 

Watched it cut away the material with my own eyes, when I broke it into 4 quadrants...

 

No other change than that...

 

 

 

Anyone ever experience this?

 

All our other posts (Mastercam posts) output the arc in 4 quadrants....

 

Working on getting CAMplete to break circles into quadrants.

 

 

Thank you for your help...

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