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  #1  
Old 12-17-2010, 8:25 PM
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Default Milling an AR lower from solid, got G-code?

anyone out there got CNC programs for milling AR lowers or uppers from solid on a 3-axis mill? I'm thinking about trying this after the busy holidays. I looked into the 80% builds but I have CNC mills and lathes as well as 7050-T7451 aluminum at my disposal so i figure what the hell, this should be a fun project.

If no one is willing to give up their programs, how about a solid model? (preferably Mastercam or IGES format).
Oh and if you're concerned, no i'm not doing this as a business, for money we make aerospace parts and have no intention of making lowers for sale, just looking for a cool personal project.

Thanks
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Last edited by icentropy; 12-17-2010 at 8:43 PM..
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  #2  
Old 12-17-2010, 8:40 PM
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Let us (me) know what you come up with.
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Old 12-17-2010, 8:57 PM
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this maybe useful

solidworks e-drawings
solid model .igs files
blueprints

http://www.cncguns.com/downloads.html
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Old 12-17-2010, 9:03 PM
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Oh man that's alot of g&m code haha. I have the solidworks of it somewhere but you can get it from cncguns too. Run a 1911 80% for me and ill sit there and write the g codes for the ar for you lol jk (maby)

I think the drilling fixtures you need to make will take more time then the actual frame.
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Old 12-17-2010, 9:07 PM
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would really like to see the end results make sure to take pics/video of it in process
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  #6  
Old 12-17-2010, 9:11 PM
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Quote:
Originally Posted by savs2k View Post
Oh man that's alot of g&m code haha. I have the solidworks of it somewhere but you can get it from cncguns too. Run a 1911 80% for me and ill sit there and write the g codes for the ar for you lol jk (maby)

I think the drilling fixtures you need to make will take more time then the actual frame.
Doing the 1911 on a CNC is a lot harder than the AR haha

I think there are like 4 different operations you have to figure out.
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  #7  
Old 12-17-2010, 9:33 PM
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Originally Posted by _Z_ View Post
Doing the 1911 on a CNC is a lot harder than the AR haha

I think there are like 4 different operations you have to figure out.
plus i don't know much about 1911s (never had one) but i'm assuming the frame is steel? Aluminum cuts like butter.

My family draws names for Christmas and then makes our gifts instead of buying them. This year I'm making my brother a replica of Blackjack's Mamba knife out of 440C. It's my first attempt at making a knife and I still have to carve the handles (found some nice wavy grained wood for that) and finish the edge, but not bad for my first knife. The hardest part was making the complex curves on the solid model. Since i have no grinders of this kind, and my hand grinding jobs on a belt sander bit the big one, i ended up profiling the entire blade surface on both sides. I have one more week to finish them
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Old 12-17-2010, 9:47 PM
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Looks like a nice set of throwing knives.
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  #9  
Old 12-17-2010, 10:00 PM
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cncguns has the gcode in the forum section.
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  #10  
Old 12-17-2010, 10:28 PM
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cncguns has the gcode in the forum section.
can't find it, could you post a link?
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  #11  
Old 12-18-2010, 6:10 PM
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What control do you have on your mill. I think that will be important to know. Different controllers use different G/M code. So depending on your machine you might not be able to use someone else's code.

If you have the iges file and master cam it's not all that hard to punch one out. It is a lot of setups though. I think 7 or 8 total, pretty time consuming, but that's part of the fun.

I made one before and that was enough. 80% have become way more affordable and more readily available.
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Old 12-18-2010, 6:28 PM
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Quote:
Originally Posted by _Z_ View Post
Doing the 1911 on a CNC is a lot harder than the AR haha

I think there are like 4 different operations you have to figure out.
I think the ar has 5 operations if i remember right. But a 1911 has like 11. Thanks alot Z i wanted a 80%. Now i might jsut have to buy yours you tricky guy. Making either will be a PITA if you sit there and do gcode.


Mastercam X > g-code
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  #13  
Old 12-18-2010, 6:42 PM
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This might also be helpful
http://arlower.ray-vin.com/ar15/
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  #14  
Old 12-18-2010, 7:16 PM
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Quote:
Originally Posted by CHAD PEZZLE View Post
What control do you have on your mill. I think that will be important to know. Different controllers use different G/M code. So depending on your machine you might not be able to use someone else's code.

If you have the iges file and master cam it's not all that hard to punch one out. It is a lot of setups though. I think 7 or 8 total, pretty time consuming, but that's part of the fun.

I made one before and that was enough. 80% have become way more affordable and more readily available.
I'd either use some older mid 90's Fadals or some 2009 Haas' if i do it. Depends on what's available at the time. We're not a high production shop so there's usually one or two mills that aren't being used for a few days at a time.

Quote:
Originally Posted by savs2k View Post
I think the ar has 5 operations if i remember right. But a 1911 has like 11. Thanks alot Z i wanted a 80%. Now i might jsut have to buy yours you tricky guy. Making either will be a PITA if you sit there and do gcode.

Mastercam X > g-code
Yeah, I can program, but i'm not our programmer so i'm not very proficient at it. We just got Catia with the prismatic machining plugin so this might be a fun way to learn to use it.
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  #15  
Old 12-18-2010, 8:57 PM
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Quote:
Originally Posted by icentropy View Post
can't find it, could you post a link?
its posted on there but its linked to another site. here it is.
http://www.homegunsmith.com/cgi-bin/...;t=6103;st=150
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  #16  
Old 12-18-2010, 9:04 PM
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You guys are a lot smarter than I since you understand the whole cnc, numbers, and programming.
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Old 12-18-2010, 10:00 PM
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Quote:
Originally Posted by _Z_ View Post
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.
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  #18  
Old 12-18-2010, 10:12 PM
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I will probably end up getting more into it sooner or later
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  #19  
Old 12-19-2010, 4:36 AM
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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.
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Old 12-19-2010, 5:40 AM
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Drill jigs? Don't need no stinking drill jigs!

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  #21  
Old 12-19-2010, 5:54 AM
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Quote:
Originally Posted by darkcbr1000rr View Post
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!
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  #22  
Old 12-19-2010, 12:53 PM
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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
N94 G28 G91 Z0
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
N201 G01 G91 Z-.202 F8.
N202 G41 D02 G90 Y0 F14.
N203 G90 X3.875
N204 Y-.6250
N205 X3.2157 Y-.9832 (5)
N206 G03 X3.0683 Y-1.321 R.3 (6)
N207 G01 X3.3497 Y-2.4231 (7)
N208 G02 X3.1929 Y-3.2542 R1. (8)
N209 G01 X2.8365 Y-3.75
N210 X1.0385
N211 X.6821 Y-3.2542 (4)
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.
N301 Y-.6250
N302 X3.2157 Y-.9832 (5)
N303 G03 X3.0683 Y-1.321 R.3 (6)
N304 G01 X3.3497 Y-2.4231 (7)
N305 G02 X3.1929 Y-3.2542 R1. (8)
N306 G01 X2.8365 Y-3.750
N307 X1.0385
N308 X.6821 Y-3.2542 (4)
N309 G02 X.5253 Y-2.4231R1.(3)
N310 G01 X.8067 Y-1.3210 (2)
N311 G03 X.6593 Y-.9832 R.3 (1)
N312 G01 X0 Y-.6250
N313 Y.5
N314 G90 G40 X-.5 Y.5
N315 M99

o4000
N400 G90 X-.5
N401 Z.1
N402 G00 X4.5
N403 G01 Z.1 F14.
N404 G91 Y.25
N405 M99

o5000
N500 G90 X-.5
N501 Z.1
N502 G00 X4.5
N503 G01 Z.01 F14.
N504 G91 Y.25
N505 M99
%
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Old 12-19-2010, 12:55 PM
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*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
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Old 12-19-2010, 1:31 PM
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Quote:
Originally Posted by savs2k View Post
*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.
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Old 12-19-2010, 1:51 PM
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Quote:
Originally Posted by grymster View Post
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
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Old 12-20-2010, 5:59 AM
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**** 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.
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Old 12-20-2010, 7:38 AM
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Quote:
Originally Posted by darkcbr1000rr View Post
**** 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.
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Lay me dun in the caul caul grun.....

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  #28  
Old 12-20-2010, 8:49 AM
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couch couch is offline
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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.
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  #29  
Old 12-20-2010, 8:52 AM
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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)
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Last edited by Lostsheep; 12-20-2010 at 9:04 AM..
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Old 12-20-2010, 8:53 AM
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Lostsheep Lostsheep is offline
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Old 12-20-2010, 8:53 AM
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Lostsheep Lostsheep is offline
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Z-1.034
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X-1.3684 Y0
Z-1.097
G1 Z-1.249 F15.
X-2.0187 Y-0.0302 F30.
G3 X-2.1578 Y0.0071 I-0.1391 J-0.2409
G1 X-2.1483 Y-0.0071
X-0.7003
Y0.0071
X-2.1578
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G3 X-0.5804 Y0.1555 I-0.0285 J0
G1 X-2.2244
G3 X-2.2479 Y0.1431 I0 J-0.0285
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G1 X-2.7054
G3 Y0.0015 I0 J-0.0295
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G2 X-2.279 Y-0.0786 I0 J-0.1895
G1 X-2.3305 Y0.0554
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G3 X-2.2244 Y-0.1575 I0.0293 J0.0085
G1 X-0.5804
G3 X-0.5499 Y-0.127 I0 J0.0305
G1 Y0.127
G3 X-0.5804 Y0.1575 I-0.0305 J0
G1 X-2.2244
G3 X-2.2496 Y0.1442 I0 J-0.0305
G2 X-2.4044 Y0.0625 I-0.1548 J0.1058
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G3 Y-0.0005 I0 J-0.0315
G1 X-2.4337
G2 X-2.2806 Y-0.0797 I0 J-0.1875
G1 X-2.3321 Y0.0542
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G3 X-2.2244 Y-0.1595 I0.0312 J0.0091
G1 X-0.5804
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(.25" EM TRIGGER SLOT)
M1
M5 M9
G0 G49 G90 Z0
M6 T22
G0 G90 S4774 M3 E1 X-1.3684 Y0
H22 M8 Z0.5
G0 Z-1.149
G1 Z-1.284 F10.
X-1.4565 Y0.0049 F20.
G3 X-1.5484 Y0.0295 I-0.0919 J-0.1591
Y-0.0295 I0 J-0.0295
G1 X-1.1804
G3 Y0.0295 I0 J0.0295
G1 X-1.5484
X-1.4565 Y0.0069
G3 X-1.5484 Y0.0315 I-0.0919 J-0.1592
Y-0.0315 I0 J-0.0315
G1 X-1.1804
G3 Y0.0315 I0 J0.0315
G1 X-1.5484
X-1.3684 Y0
Z-1.319 F10.
X-1.4565 Y0.0049 F20.
G3 X-1.5484 Y0.0295 I-0.0919 J-0.1591
Y-0.0295 I0 J-0.0295
G1 X-1.1804
G3 Y0.0295 I0 J0.0295
G1 X-1.5484
X-1.4565 Y0.0069
G3 X-1.5484 Y0.0315 I-0.0919 J-0.1592
Y-0.0315 I0 J-0.0315
G1 X-1.1804
G3 Y0.0315 I0 J0.0315
G1 X-1.5484
X-1.3684 Y0
Z-1.35 F10.
X-1.4565 Y0.0049 F20.
G3 X-1.5484 Y0.0295 I-0.0919 J-0.1591
Y-0.0295 I0 J-0.0295
G1 X-1.1804
G3 Y0.0295 I0 J0.0295
G1 X-1.5484
X-1.4565 Y0.0069
G3 X-1.5484 Y0.0315 I-0.0919 J-0.1592
Y-0.0315 I0 J-0.0315
G1 X-1.1804
G3 Y0.0315 I0 J0.0315
G1 X-1.5484
X-1.4565 Y0.0089
G3 X-1.5484 Y0.0335 I-0.0919 J-0.1592
Y-0.0335 I0 J-0.0335
G1 X-1.1804
G3 Y0.0335 I0 J0.0335
G1 X-1.5484
G0 Z0.5
M5 M9
G0 G49 G90 Z0
E0 X0 Y0
M6 T20
M2
%
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  #32  
Old 12-20-2010, 9:12 AM
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icentropy icentropy is offline
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Originally Posted by savs2k View Post
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.
Make just one?! now who would be silly enough to do thost type of setups and create all the fixturing for just one I'd probably end up making enough to make sure my family won't need to purchase another lower for the forseeable future.

And yeah if i do do this i would only consider using some sort of CAM software for the bulk of it. I mean hand writing G-code for some holes or simple parts is one thing, but doing it for something like the external profile of a mil-spec lower is ridiculous.
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  #33  
Old 12-20-2010, 9:13 AM
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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. Calculating all of the 3d points would take a team of skilled guys a long time.
Well, you just about managed to bring the forum down with that!

I've never really looked at an AR lower, but I have a model and it seems pretty orthogonal. Don't see where a bunch of surfacing is required.

Most of the program you posted looks like roughing passes. Is that correct?
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  #34  
Old 12-20-2010, 9:26 AM
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Let's all flex at once, ready? GO!
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  #35  
Old 12-20-2010, 10:04 AM
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Quote:
Well, you just about managed to bring the forum down with that!

I've never really looked at an AR lower, but I have a model and it seems pretty orthogonal. Don't see where a bunch of surfacing is required.

Most of the program you posted looks like roughing passes. Is that correct?
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That was the entire program including finishing cuts on the walls. I have the pockets done as "pocketing operations" which include finishing passes at each depth. I relieve the shank and flutes on my endmills so that only the lower part of the flute does any cutting. This helps relieve chattering issues when I use such long endmills. Also, my Z steps were pretty small and that makes the code really long.

As for surfacing, the rounded and raised ribs around the mag release and mag well could be done with corner rounders but I am too lazy to do that. Cncguns.com has an awesome sequence of pictures showing all of the 3d roughing and 3d surfacing that he did. (http://www.cncguns.com/projects/ar15lower.html) I would attack the problem in a similar fashion. I don't really like corner rounders, they are a little bit of a PITA to get dialed in. I have less blending issues when I just surface stuff.

Quote:
Let's all flex at once, ready? GO!
The OP asked for g-code so there it is!! And here's the toolpath:


Edit:
There's plenty more where that came from!!!
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  #36  
Old 12-20-2010, 10:51 AM
veryslowstang veryslowstang is offline
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Lostsheep, what is the E1 on the spindle speed line? I can read the rest of the program, but that is one damn big program for that little pocket.
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  #37  
Old 12-20-2010, 11:19 AM
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Quote:
Lostsheep, what is the E1 on the spindle speed line? I can read the rest of the program, but that is one damn big program for that little pocket.
E1 is the fixture offset for my Fadals. My other mills only have 6 fixture offsets (g54 thru g59) but the fadals have 30.

The code is very long but it gave me good results. I was concerned about chattering and breaking the only long 3/8ths endmill that I had. You can see it in the code but for those less familiar with g code, I was running 30 ipm @ 5000rpm and 1/16" z steps. I could get the program shorter but until I am running lots of them I am not too worried about it.
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  #38  
Old 12-20-2010, 11:20 AM
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E1 is the work offset.
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  #39  
Old 12-20-2010, 3:51 PM
darkcbr1000rr darkcbr1000rr is offline
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Quote:
Originally Posted by grymster View Post
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.

Yeah I mainly use geopath. But my father uses mastercam for 3D stuff on the Komo. I'm trying to talk him into getting a 5-axis machine tool so I can start learning how to 3D. This community college by me has these Mastercam courses that really caught my attention. I'm always trying to learn more and more about machining.


Lostsheep- I've never messed with fadal controls. Any pros and cons over other controls? I've always used Fanuc, haas, and yasnac.

Nice code. Super long. I think my cam post is a little shorter. I didn't make too many Z moves. Maybe 5 steps all the way to depth for my FCP. Still though, only took like 15-17 minutes from part in to part out.
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  #40  
Old 12-20-2010, 10:53 PM
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lostsheep reading your code made me cry. It's been a while since I wrote some code but I remember why I stopped now =D.
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