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  1. 09-09-2008, 05:52 PM #1 cossiegaz
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    cossiegaz is offline Member Join Date Sep 2008 Location Great Britain Posts 35 Downloads0 Uploads0

    Default G98 and G99 differences?

    I know this may sound like a bit of a basic question to some people on here but i only completed my apprenticeship 2years ago so am still in the early stages of my career and trying to get my head round programming. Can somebody please explain to me the difference between G98 and G99 drilling cycles with reference to a fanuc control? An example of a cycle for each code with an explanation of the differences would be nice. ThanksSimilar Threads:
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  2. 09-09-2008, 06:36 PM #2 petek
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    petek is offline Registered Join Date Jan 2005 Location us Posts 26 Downloads0 Uploads0

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    G98 is initial plane return and G99 is referance plane return. M6 T1 G0 G90 X1 Y-1. M3 S2500 G43 Z2. H1 M8 G81 G98 Z-.25 R.1 F10. X2. X3. X4. G80 In G98 the tool will rapid to Z.1("R" plane), drill the hole rapid back to Z2.("Initial" plane) move to next position, rapid to Z.1 drill Rapid back to Z2. etc In G99 mode at 1st hole Z would rapid to Z.1("R" plane) ,drill hole, rapid back to Z.1("R" plane) move to next hole, drill etc. I use G98 as a safety to clear clamps and fixtures Hope this is clear Pete
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  3. 09-11-2008, 03:54 PM #3 cossiegaz
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    cossiegaz is offline Member Join Date Sep 2008 Location Great Britain Posts 35 Downloads0 Uploads0

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    Thanks, that makes sense. I also understand that if i change the G81 to G83 and add a 'Q' value (for example Q0.200) into the cycle then the drill will then take 0.200" cuts until it reaches the programmed Z depth, what confuses me is that some machines/programmes i have operated will rapid the drill to the R plane, take the 0.200" cut, rapid back to the R plane, rapid back down to the finish point of the last cut, take another 0.200" cut, rapid back to the R plane and continue like that until the full depth is achieved whereas other machines/programmes i have operated will use feed movements instead of rapid movements when moving back up to the R plane and back down to cut the next Q value. Is this controlled by what is entered into the drilling cycle by the programmer, or is it just a case of different machines achieving the same outcome but in slightly different ways?
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  4. 09-18-2008, 07:37 AM #4 CNC-Hammer
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    CNC-Hammer is offline Registered Join Date Jul 2008 Location Australia Posts 81 Downloads0 Uploads0

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    G83 is a deep hole drilling cycle so it will rapid out of the hole to remove swarf and then rapid to a position above the next cut depth and then feed to the next peck and so on until the final depth has been achieved. Perhaps a parameter was changed to enable feed rather than rapid or perhaps the rapid was turned down.
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  5. 09-18-2008, 11:36 AM #5 stevo1
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    stevo1 is offline Registered Join Date Jun 2008 Location United States Posts 1511 Downloads0 Uploads0

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    It is called Peck drilling cycles. This is not going to be the style of machine that determines this. It will be the programmer. This is used for chip removal. The peck drilling cycles are G73 and G83. Using the G83 is what you are typically seeing. As CNC-Hammer has stated G83 is normally used in deep hole drilling. This will bring the tool back to the R-plane after every pick amount set by your Q value. This is bacause due to the depth of the hole a lot of times the chips can't be flushed out or broke off at that depth. The G73 cycle it is called high speed peck drilling. This will drill the depth of your pick and back off an amount. I believe that it is typically .1". I can't remember I think this value is set by a parameter. This is used when all that is needed to break and clear the chip is a small movement off of contact. This cycle is faster then the G73. Hope this helps. Stevo
    Last edited by stevo1; 09-19-2008 at 09:13 AM.
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  6. 09-19-2008, 06:02 AM #6 CNC-Hammer
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    CNC-Hammer is offline Registered Join Date Jul 2008 Location Australia Posts 81 Downloads0 Uploads0

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    Stevo1, correct me if I'm wrong but isn't G73 the high speed cycle?
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  7. 09-19-2008, 06:04 AM #7 CNC-Hammer
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    CNC-Hammer is offline Registered Join Date Jul 2008 Location Australia Posts 81 Downloads0 Uploads0

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    cossiegaz! Try the following link mate http://www.cncezpro.com/gcodes.cfm
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  8. 09-19-2008, 09:16 AM #8 stevo1
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    stevo1 is offline Registered Join Date Jun 2008 Location United States Posts 1511 Downloads0 Uploads0

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    Quote Originally Posted by CNC-Hammer View Post Stevo1, correct me if I'm wrong but isn't G73 the high speed cycle? My apologize You are correct. I explained G83 then when It came to G73 I typed G83 again. I have edited my post. Thank you for the correction. Stevo
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  9. 09-21-2008, 05:26 PM #9 cossiegaz
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    cossiegaz is offline Member Join Date Sep 2008 Location Great Britain Posts 35 Downloads0 Uploads0

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    Thanks for your help guys.
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  10. 05-03-2016, 06:18 AM #10 hnoor0077
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    hnoor0077 is offline Registered Join Date May 2016 Location Pakistan Posts 2 Downloads0 Uploads0

    Default Re: G98 and G99 differences?

    Is this controlled by what is entered into the drilling cycle by the programmer, or is it just a case of different machines achieving the same outcome but in slightly different ways?????
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  11. 05-21-2016, 01:00 PM #11 the_gentlegiant
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    the_gentlegiant is offline Member Join Date May 2016 Location United States Posts 476 Downloads0 Uploads0

    Default Re: G98 and G99 differences?

    Hey Cossiegaz, (Just realized the original post was ages ago. Oh well. Maybe somone can find usefulness in the following.) You've gotten a lot of good info back from others explaining your question. Here's a little more for you to remember or think about when using G98 and G99 to your advantage. One thing to remember when getting fancy in mixing up G98's and G99's during any one drilling cycle, is to remember that before every hole drilled, the machine will move to the last defined R level at a rapid feed rate, no matter what you've got the drill doing before or after. This seems obvious, but when you're dancing around part and fixture obstacles during a drilling cycle, and switching back and forth between G98 and G99, it just helps me keep clear about what rapid Z movements to expect. I use G98 as my puddle jumper so to speak. Got a fixture clamp in the way? How about part features at various Z levels? G98 is the easy way to make light of obstacles. Here's a super simple example. You've got 8 holes to drill across the top of a plate lets say. But you've got hold down clamps blocking the path between the 2nd and 3rd hole and the 6th and 7th. Then like this: G0X1.5Y3. G43Z3.5H1S3000M3T2_____ (Z3.5 represents the height you'll need to clear your clamp and is your "initial" level.) M8 G99G81Z-0.8R0.1F18. _____(This drills the first hole. Machine will rapid move to R0.1 from the Z3.5 that it is currently sitting at.) G98X3. _____ (Here the drill retracts to "initial" level, but remember after the move to the next hole,it will rapid back down to R0.1) G99X4.5 ____ (Here the drill retracts to R0.1 level because there are no obstacles between the current hole and the next) X6. ________ (And so on) X7.5 G98X9. _____(Just remember, G98 before the coordinate of the hole BEFORE the up coming obstacle.) G99X10.5 ___(And G99 after again when there are no more fears to tread.) X12. G80 ________(Remember you can make countless changes to Z, R, Q, P, F, S, G90, G91, even switch to another fixed cycle, without ever needing to cancel with G80 first. But you only get one "initial level" with each G80.) M9 One other thing I use G98 for is saving a little time after spot drilling. Especially with large drills and slow feed rates. In many cases I'll spot drill with 120 deg spotters, and drill with 118 deg drills. I also spot deep enough to leave a nicely chamfered hole after the drill is done. But in doing this, especially on larger holes, you've got a pretty deep spot pocket, so no need to start your drill feed from Z0.1. My point being, on a 7/8" diameter hole say, you'll have a spot depth with chamfer of aprox. Z-0.255. Why should I start my drilling feed 0.355" away from the material? So in these drill after spot situations, your G43Z "initial" height will be the usual Z0.1, but your drilling cycle will be full time G98 retract with a minus R feed start level. (R-0.155) In English: T1M6 (7/8 DRILL 118 DEG) G0X2.Y0. G43Z0.1H1S395M3T2 M8 G98G81Z-0.775R-0.155F6.4 _____(Initial height retract with rapid minus R level to feed start) X4.Y2. _______________________(And so on.) Note: All the above comments hold for many if not all Fanuc controls. Not sure with others. Well that's my two cents for the day. I need to get to work. I hope this gives you some ideas and saves you time on your work.
    Last edited by the_gentlegiant; 05-22-2016 at 12:31 AM.
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G98 and G99 differences? G98 and G99 differences?

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