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You are using an out of date browser. It may not display this or other websites correctly.You should upgrade or use an alternative browser. G12 & G13 Circular pocket milling

• Thread starter Thread starter texasv6buick
• Start date Start date Oct 18, 2007
• Replies Replies 6
• Views Views 43,029

T

texasv6buick

Plastic

Joined Mar 17, 2006 Location hewitt, texas Hello guys: My name is Jerry Berger. I come on this site everyday almost; but seldom post. I like to look at whats being said, and try to learn. I am fairly new to cnc mill operation. The company I work for just recently bought a Mori Seiki NV5000 mill. I have little experience on mills; but want to learn as much as I can.The mill has a Fanuc control. I need to see the proper code to mill a bore lets say 3.0" I.D. . The bore is in a casting and has about 1/8" per side to remove.That being said the casting has a approximate bore of 2.750". I will be using a 3/4" endmill to rough and follow up with a finish endmill. I mainly need to see the correct code format to cut this bore starting with the cast bore. Thanks in advance Jerry Berger H

Heinz R. Putz

Stainless

Joined Mar 16, 2006 Location Columbus, Ohio Hello Jerry: Your question involves a lot more than just writing you a sequence of motions. You also need to learn circular interpolation, the use of the I and J values to define where the circle center is located and the proper use of cutter comp. None of which is very complicated, but it would be too much to explain in a short answer. It was the Yasnac and the Mitsubishi controls that hat the G12(CW) and the G13(CCW) cycles, to the best of my memory Fanuc never had that cycle. I have some examples on the website how to some of what you ask on a Fanuc control, even with cutter comp, so take a look at it and learn from it. Go down to where it says: Learn for free. Heinz. Http://home.columbus.rr.com/hputz S

SeymourDumore

Diamond

Joined Aug 2, 2005 Location CT Heinz I believe - based on the topic title - he is specifically asking about G12/13 programming of circle. In that case I and J has different meaning. And yes, I think it is a Yasnac cycle, at least that's how the Haas manual describes it. Jerry G12 and 13 allows the complete machining of a circle with rough and finish allowances and individual Z-step downs. The first rule is, you must position the tool in the middle of the circle first. Next you move to the finished Z depth, or to the Z depth of the first pass. At this point you invoke the G12/13 cycle, which in turn sort of defines a local X/Y0 and completes the circle based on the parameters of your preference. Now, to put this in context of your question, let's say you want to make a rough pass and a finish pass. Assume the center of this hole is at X3. Y3., bottom is at Z-.5, You're making 1 rough pass at 2.98 dia, leaving .01/side for finish. T1 M06 G00 G43 H01 D11 <-- ASSUMING OFFSET11 FOR YOUR DIA. G00 X0 Y0 Z.5 S1200 M03 M08 G01 Z-.5 F200. G13 I1.49 K1.5 Q.01 F5. G01 Z.5 F200. M09 ... ... ... Not sure if your manual describes the proper useage for your control, but on a HAAS it is as such: D - Tool diameter/radius offset selection I - Radius of first circle, or finish if K is omitted K - Radius of finished circle L - loop count for repeated deeper cuts Z - depth of cut or increment [when used with L] Q - Radius increment [must be used with K] F - feedrate within cycle On the Haas, D can be ommitted in the block as it defaults to the active dia offset. You also can specifically call D0 if no tool offset is wanted/needed. On edit: This is assuming you're using FULL cutter comp with the proper dia in your offset table. T

texasv6buick

Plastic

Joined Mar 17, 2006 Location hewitt, texas Thanks guys: I think I am headed in the right direction now. I did not realize that the fanuc did not use G12/G13.I have written a few programs using cutter comp., and positioning the end mill, and then ramping in to the finish radius; by using a smaller radius than the finish radius. Thanks Jerry Berger S

SeymourDumore

Diamond

Joined Aug 2, 2005 Location CT Man, there otta' be a law against useless websites...!!! I was looking to find some info on the NV machines, as I thought they came with a Mitsubishi control. I guess we'll never know from the website... A

Andy221

Cast Iron

Joined Mar 13, 2013 Location moorhead mn

SeymourDumore said: Heinz I believe - based on the topic title - he is specifically asking about G12/13 programming of circle. In that case I and J has different meaning. And yes, I think it is a Yasnac cycle, at least that's how the Haas manual describes it. Jerry G12 and 13 allows the complete machining of a circle with rough and finish allowances and individual Z-step downs. The first rule is, you must position the tool in the middle of the circle first. Next you move to the finished Z depth, or to the Z depth of the first pass. At this point you invoke the G12/13 cycle, which in turn sort of defines a local X/Y0 and completes the circle based on the parameters of your preference. Now, to put this in context of your question, let's say you want to make a rough pass and a finish pass. Assume the center of this hole is at X3. Y3., bottom is at Z-.5, You're making 1 rough pass at 2.98 dia, leaving .01/side for finish. T1 M06 G00 G43 H01 D11 <-- ASSUMING OFFSET11 FOR YOUR DIA. G00 X0 Y0 Z.5 S1200 M03 M08 G01 Z-.5 F200. G13 I1.49 K1.5 Q.01 F5. G01 Z.5 F200. M09 ... ... ... Not sure if your manual describes the proper useage for your control, but on a HAAS it is as such: D - Tool diameter/radius offset selection I - Radius of first circle, or finish if K is omitted K - Radius of finished circle L - loop count for repeated deeper cuts Z - depth of cut or increment [when used with L] Q - Radius increment [must be used with K] F - feedrate within cycle On the Haas, D can be ommitted in the block as it defaults to the active dia offset. You also can specifically call D0 if no tool offset is wanted/needed. On edit: This is assuming you're using FULL cutter comp with the proper dia in your offset table. Click to expand...

I know this is an old thread and I appologize, but it applies directly to what I'm doing. I am actually trying thus at work and my machine (Haas vf7) is giving me a fail without a G40. On what line do you put it in? A

angelw

Diamond

Joined Sep 10, 2010 Location Australia

Andy221 said: I know this is an old thread and I appologize, but it applies directly to what I'm doing. I am actually trying thus at work and my machine (Haas vf7) is giving me a fail without a G40. On what line do you put it in? Click to expand...

Hello Andy, Cutter Radius Comp is assumed by G12(G42) and G13(G41). No G40 is required after the Cycle has completed; however, you should ensure that CRC is not active beforehand. Post your actual code for the Forum to see and be better able to advise you. Regards, Bill You must log in or register to reply here.

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