Milling an AR lower from solid, got G-code?

[_Z_]

You guys are a lot smarter than I since you understand the whole cnc, numbers, and programming.

[eaglemike]

You guys are a lot smarter than I since you understand the whole cnc, numbers, and programming.

Once you get into it, it's not that hard to understand how to create simple tool paths. The trick is fixturing, as in how to hold the parts during each operation. There is artistry in doing that well. Speeds (cutter or work rpm)and feeds (how fast the tool moves across the work), most efficient cutter to use, how much material to remove each path, those are also handy to know. CNC is so cool. I started a long time ago in a manual shop, still had some machines driven by leather belts.

[_Z_]

I will probably end up getting more into it sooner or later

[darkcbr1000rr]

Don't bother with it. Too much work. Unless you have a lot of time to figure out how to hold your part. And how come everybody calls it g code when they are using cad/cam? I call it cam posts. When it is g code you actually write it out line by line. I don't think most people are writing code line by line on notepad.

[grymster]

Drill jigs? Don't need no stinking drill jigs!

[grymster]

Don't bother with it. Too much work. Unless you have a lot of time to figure out how to hold your part. And how come everybody calls it g code when they are using cad/cam? I call it cam posts. When it is g code you actually write it out line by line. I don't think most people are writing code line by line on notepad.

CAM systems generate machine specific g-code.

Personally, I wouldn't ask for g-code, rather I'd ask for the CAD model and generate my own code to be sure it works on the machine I'll be using. While g-code is a standard, it's not really standard. Different controllers sometimes use different codes for the same operations or the same code may do different things. Also, some machines use I and J offsets for circular interpolation and some use a radius value. Even the I and J can be used differently. You'd also want to know whether the g-code is in absolute, incremental or both. Are there subprograms in the code? Fanuc Custom Macros? Heidenhain Q parameter?

Actually, writing the g-code without a CAM system wouldn't be too difficult. After all, that's what we did before there were CAM systems!

[savs2k]

I was talking about g&m code but was saying mastercam is so much easier... I rather use mastercam and draw my part with lines then do this again... All this code is for a bottom jaw that looks like a tombstone for a can crusher

THIS IS G&M code for whoever doesn't know. It's also why you don't wanna sit there and program any gun parts by hand. This part is a simple 3x4" park or something i dont remember I just pulled out a random one I finished. Programed for a HAAS and run on vericut

%
O4444
(G54)
N1 G28 G91 Z0
N2 G00 G17 G20 G40 G49 G80 G90 M05
N3 T2 M06 (.5" END MILL)
N4 G54 X4.5 Y-4. S2400 M03
N5 G43 H02 Z.1 M08
N6 G01 Z0 F14.
N7 M98 P1000 L17
N8 Z.1
N9 G00 G90 X-.5 Y.5
N10 G01 Z0 F8.
N11 M98 P2000 L5
N12 G28 G91 Z0
N13 G00 G17 G20 G40 G49 G80 G90
N14 T01 M06 (.5"SPOT DRILL)
N15 G54 X3.5 Y.5 S2400 M03
N16 G43 H01 Z.1 M08
N17 G01 Z-.130 F8.
N18 M98 P3000
N19 G01 Z-.150 F8.
N20 M98 P3000 (CHAMFER SET RADIUS .050)
N21 G28 G91 Z0 M09
N22 G00 G17 G20 G40 G49 G80 G90 M05
N23 M00


(G55)
N24 G28 G91 Z0
N25 G00 G17 G20 G40 G49 G80 G90
N26 T02 M06 ( .5" END MILL)
N27 G55 X4.5 Y-4. S2400 M03
N28 G43 H02 Z.1 M08
N29 G01 Z.01 F14.
N30 M98 P4000 L17
N280 G90 X-4.5 Y-4.
N290 G01 Z.01 F14.
N301 M98 P5000 L17
N31 G90 X4.5 Y-4.
N32 G01 Z0 F14.
N33 M98 P1000 L17
N34 G90 X-4.5 Y-4.
N35 G01 Z0 F8.
N36 G28 G91 Z0
N37 G00 G17 G20 G40 G49 G80 G90
N38 T01 M06 (.5" SPOT DRILL)
N39 G55 X3.5 Y.5 S2400 M03
N40 G43 H01 Z.1 M08
N41 G01 Z-.080 F8.
N42 M98 P3000
N43 G01 Z-.10 F8.
N44 M98 P3000
N45 G28 G91 Z0
N46 G00 G17 G20 G40 G49 G80 G90
N47 T05 M06 (.5" 135 DEGREE DRILL)
N48 G55 X1.9375 Y-.5630 S2400 M03
N49 G43 H05 Z.1 M08
N50 G99 G83 Z-.4 Q.1388 R.050 P.01 F19.
N51 G80
N52 G28 G91 Z0
N53 G00 G17 G20 G40 G49 G80 G90
N54 T02 M06 (.5" END MILL)
N55 G55 X1.9375 Y-.5630 S2400 M03
N56 G43 H02 Z.1 M08
N57 G13 Z-.3 I.2 K.305 Q.1 D02 F8.
N58 Z.1
N59 G13 Z-.5 I.2 K.312 Q.1 D02 F8.
N60 Z.1
N61 G28 G91 Z0
N62 G00 G17 G20 G40 G49 G80 G90 M05
N63 M00



(G56)
N64 G28 G91 Z0
N65 G00 G17 G20 G40 G49 G80 G90
N66 T01 M06 (.5" SPOT DRILL)
N67 G56 X.3125 Y-.5 S2400 M03
N68 G43 H01 Z.1 M08
N69 G99 G82 Z-.2 F14.P.03 R.2
N70 G80 Z.1
N71 G28 G91 Z0
N72 G00 G17 G20 G40 G49 G80 G90
N73 T03 M06 (#21 DRILL)
N74 G56 X.3125 Y-.5 S6000 M03
N75 G43 H03 Z.1 M08
N76 G99 G83 Z-.7829 Q.0783 P.01 R.1 F17.
N77 G80 Z.1
N78 G28 G91 Z0
N79 G00 G17 G20 G40 G49 G80 G90
N80 T04 M06
N81 G56 X.3125 Y-.5 S200
N82 G43 H04 Z.1 M08
N83 G99 G84 Z-.4750 R.1 F6.25
N84 G80 Z.1
N85 G28 G91 G49 Z0 M05
N86 M00

N87 G28 G91 Z0
N88 G00 G17 G20 G40 G49 G80 G90
N89 T01 M06 (.5" SPOT DRILL)
N90 G56 X.3125 Y-.5 S2400 M03
N91 G43 H01 Z.1 M08
N92 G99 G82 Z-.2 F14.P.03 R.2
N93 G80 Z.1
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N95 G00 G17 G20 G40 G49 G80 G90
N96 T03 M06 (#21 DRILL)
N97 G56 X.3125 Y-.5 S6000 M03
N98 G43 H03 Z.1 M08
N99 G99 G83 Z-.7829 Q.0783 P.01 R.1 F17.
N100 G80 Z.1
N101 G28 G91 Z0
N102 G00 G17 G20 G40 G49 G80 G90
N103 T04 M06
N104 G56 X.3125 Y-.5 S200
N105 G43 H04 Z.1 M08
N106 G99 G84 Z-.4750 R.1 F6.25
N107 G80 Z.1
N108 G28 G91 G49 Z0 M05
N109 M30












o1000 (FACING)
N100 G90 X-.5
N101 Z.1
N102 G00 X4.5
N103 G01 Z0 F14.
N104 G91 Y.25
N105 M99

o2000 (PERIMETER)
N200 X-.5 Y.5
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N208 G02 X3.1929 Y-3.2542 R1. (8)
N209 G01 X2.8365 Y-3.75
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N212 G02 X.5253 Y-2.4231 R1.(3)
N213 G01 X.8067 Y-1.3210 (2)
N214 G03 X.6593 Y-.9832 R.3 (1)
N215 G01 X0 Y-.6250
N216 Y.5
N217 G90 G40 X-.5 Y.5
N218 M99

o3000 (CHAMFER)

N300 G90 G41 D01 X3.875 F8.
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N305 G02 X3.1929 Y-3.2542 R1. (8)
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o4000
N400 G90 X-.5
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o5000
N500 G90 X-.5
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N503 G01 Z.01 F14.
N504 G91 Y.25
N505 M99
%

[savs2k]

*part

Anyways you can just draw it up in mastercam and take the g code out form there if you really wanted the g code

[grymster]

*part

Anyways you can just draw it up in mastercam and take the g code out form there if you really wanted the g code

Mastercam generates g-code. I think you know that, but there does seem to be some confusion here. CAM systems employ a graphical user interface, allowing the operator to easily select features on which to apply tool path, then generate (post-process) that tool path in controller specific g-code. That's what's sent to the machine.... g-code.

We use:

AlphaCam
SurfCam (my favorite)
Gibbs
Esprit
Hypermill (the very best tool paths if you ask me)
CamWorks
SolidCam
Some Flow waterjet software I've never used
Fanuc Custom Macro B
and plain old, hand generated g-code

Gives a lot of options to get the job done. It's all good.

[savs2k]

Mastercam generates g-code. I think you know that, but there does seem to be some confusion here. CAM systems employ a graphical user interface, allowing the operator to easily select features on which to apply tool path, then generate (post-process) that tool path in controller specific g-code. That's what's sent to the machine.... g-code.

We use:

AlphaCam
SurfCam (my favorite)
Gibbs
Esprit
Hypermill (the very best tool paths if you ask me)
CamWorks
SolidCam
Some Flow waterjet software I've never used
Fanuc Custom Macro B
and plain old, hand generated g-code

Gives a lot of options to get the job done. It's all good.

yeah I know it does =D. I was stating what I did because OP wanted gcode and I was pointing out to those who don't know CNC that doing that many operations for a lower isn't worth it to do just one. OP said if no one wanted to give up gcode that solidworks or mastercam is fine and I was saying mastercam is so much easier then writting g&m code.

I'm pretty rusty now a days and i'm sure advice is better given from someone else. I probably wouldn't even be able to get my toolpathing to work correctly at the moment. But I am HAAS certified if anyone thinks im bsing

[darkcbr1000rr]

**** grymster. That's a lot of cad/cam software. Our shop runs mastercam, surfcam, and geopath. When I started learning about writing g code by hand, the I and j values always effed me up. I wouldn't know if I had to use positive or negative values. I thought I was gonna go crazy. Thank god for cad/cam and igs files.

[grymster]

**** grymster. That's a lot of cad/cam software. Our shop runs mastercam, surfcam, and geopath. When I started learning about writing g code by hand, the I and j values always effed me up. I wouldn't know if I had to use positive or negative values. I thought I was gonna go crazy. Thank god for cad/cam and igs files.

We don't use the Gibbs, CamWorks or SolidCam much, but every now and then they're handy.

I used to have contests with other guys. See who could program bolt circles or O-ring grooves or other features faster; me at the controller with my HP15-C, or them using a CAM system. I won most of those. .... of course, with more complex geometry, you really need CAM. It's all fun stuff. Just wish I got to do it still.

[couch]

Sitting at my desk right now programming a thirty two hour long milling operation for a mold. If I posted the code it would shut the forum down.

It sounds like everyone in here knows a bit about machining/programming but some sound slightly confused.

G-Code =G-Code whether written via CAM Software or punched into the control by hand.

If I'm not mistaken, Justin over at CNCGuns even posted his CAM files... I remember finding code, setup sheets and pretty sure the CAM files. There is a step by step showing of how he did his in the Projects section of his site. Definitely worth a look.

[Lostsheep]

All this talk of writing out g-code for milling a lower from scratch makes me laugh. I am better than most at cartesian coordinates, and I can generate/read g-code, there is no way I would even think about trying to generate a 3d tool path for a lower. Could it be done, yes but it is not practical. This is my code for a 90's Fadal JUST FOR THE FCG. It's pretty long for how simple the geometry is but I was not especially concerned with cycle time or program size because I was only doing 2(Cycle time was about 20 minutes). Calculating all of the 3d points would take a team of skilled guys a long time.


%
O1
(.25" DRILL PILOT)
M6 T20
G0 G90 S5000 M3 E1 X-1.5484 Y0
H20 M8 Z1.
G83 G98 R0.1 Z-1.4251 X-1.5484 Y0 F30. Q0.1
G80
(.375" EM 2.625 REACH)
M1
M5 M9
G0 G49 G90 Z0
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[Lostsheep]

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(.375" EM SECOND STEP)
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