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IndustryArena Forum > MetalWorking Machines > Okuma > 95 LNC 8 threading help
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  1. #1
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    Sep 2016
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    22

    95 LNC 8 threading help

    So I have been learning this machine (95 LNC8 with 5020L) and have had some great success. Now I am trying to get any threading cycle to work and I am having some trouble. I am brand new to cnc lathe and this is my first Okuma. So I have a few things to overcome I know. I am doing .685X40 internal threads. I have the program set up to do 2 passes and a spring pass. Here is my problem. If I run a G32 cycle as generated from Fusion, the machine alarms out with a 450B data word X,Z alarm. In my research I see Okuma wants the X positions on the G32 line. So I added the redundant X positions to the G32 line of code and it runs. I set my work Z offset 1 " away from the part and watch it run. Looks like it rapids down the hole in Z and moves back in a feedrate speed like creating reverse threads. I have no doubt I am doing something wrong here. I then tried to generate a G71 threading cycle to do the same job and the machine alarms out as soon as it gets to the G71 line. Sadly I did not write that alarm message downas this beatdown took its toll today. Here are a few pics of the Code I am working with. Please help me find the holes and let me know what I am doing wrong here. I do know this machine is very picky on the code it will run due to its age and "Okumaness". I am still learning what that is. This is my first attempt to thread anything on it.

    First pic is as generated G32 (wont run)
    Second pic is G32 with redundant X on G32 line (runs but not correctly)
    Third pic is G71 as generated.

    I would really like to make the G71 work. I am just unsure if the machine can run it at all or if there is something I need to change thats out of place for this machine.

  2. #2
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    Feb 2011
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    348

    Re: 95 LNC 8 threading help

    G32 is for x axis threading
    G33 is for longitude threading

    G33X.xxxx Zxxxx F= THREAD LEAD
    G33X.xxxx

    N6
    (THREADING BAR)
    (THREADS 3/4-48 THREAD)
    G0G97M3S1000T0606M8M42
    G0X1.100Z.200
    G71X.7194Z-.360B60D.006U.002H.0128J48F1
    G0X1.00Z.200
    M8
    G0X15Z2.00
    /M01

    X=X
    Z=Z
    B= IN FEED ANGLE
    D=1ST DEPTH OF CUT IN EXPRESSED IN DIAMETER
    U= FINISHING ALLOWANCE IN DIAMETER
    H= THREAD HEIGHT IN DIA.
    J= THREAD PITCH
    F=1 (ENGLISH ) AS THIS TAKES F/J FOR FEED RATE

  3. #3
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    Join Date
    Sep 2016
    Posts
    22

    Re: 95 LNC 8 threading help

    Thanks a lot for the help. I wrote the threading cycle line with G71 a few different ways and I never got it to work. I ended up trying the G33 cycle. What finally worked was G33 with adding the redundant X position to the line of code.

    Here is my final program for .685x40 threads. (.665 minor .685 major) ( Done in three passes and a spring pass )
    Tool is a Micro 100 (2001000 thread tool)

    G50 S2000
    G0 X400.
    G0 Y400.

    T040404
    M8
    G95
    G97 S300 M3 M41
    G0 X0.665 Z0.1969
    G0 Z0.04
    X0.6717
    G33 X0.6717 Z-0.59 F0.025
    G0 X0.650
    Z.04
    X0.6783
    G33 X0.6783 Z-0.59 F0.025
    G0 X0.650
    Z.04
    X0.685
    G33 X0.685 Z-0.059 F0.025
    G0 X0.0650
    Z0.04
    X0.685
    G33 X0.685 Z-0.059 F0.025
    G0 X0.650
    Z0.1969

    M9
    G90 G0 X400. Z400.
    M2
    %

    i have gotten a ton of help from this community and I really appreciate it. You could pretty much thread anything with this format. I now know that. I hope this helps someone that struggled with this as I did.

  4. #4
    Member
    Join Date
    Jun 2015
    Posts
    3318

    Re: 95 LNC 8 threading help

    hy please check attached threading section from the manual

    i also have re-writen your code

    for smooth finish, use spring pases combined with re-cutting the crest ( using the tool before the thread ) and the chamfers ( towards the root diameter ); operations type & order, and number of repetetions, may vary, depending on threading insert and others

    g33 is more powerfull than g71, since it allows better control, but coding it is a bit more demanding

    i have used g33 for years, but lately i switched to g34, in order to better manage vanished treads and repositioning motions

    is possible to eliminate one turret index, by cutting the chamfer also with the threading insert, using one extra offset, ... and there are others tricks as well / kindly


    Code:
    
    
        G50 S2000
        G00 X400 z400
    
    
        T040404 G97 S300 M03 M41 M08
            X0.665  Z 0.04
        G33 X0.6717 Z-0.59 F0.025 G95
            X0.6783
            X0.685
            X0.685
    
    
        G00 X400 Z400 M09 T0400
    
    
    M02
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

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