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IndustryArena Forum > MetalWorking Machines > Okuma > Okuma eccentric turning (camshaft)
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  1. #1
    Join Date
    Mar 2008
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    10

    Okuma eccentric turning (camshaft)

    Hello

    I need info about turning eccentric shaft (camshaft) at OKUMA Multus machine.
    If someone have experience with this type of turning, can you share some dummy NC program of this proccess?

    Thank you in advance

  2. #2
    Join Date
    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    hi, send cad file or technical drawing so to give you code

  3. #3
    Join Date
    Mar 2008
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    10

    Re: Okuma eccentric turning (camshaft)

    Hello

    Sorry for delay.
    Attached is shaft in STEP format.

    Thank you again for you help.

  4. #4
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    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    hi, i can not open step. i know what it is, but i dont use that kind of software. please, just send a technical drawing of your excentric section. .... also, printscreen with all dimensions is enough ...

  5. #5
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    Mar 2008
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    10

    Re: Okuma eccentric turning (camshaft)

    Drawing is attached in PDF format.

  6. #6
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    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    this is some kind of a start-up with excentric machining

  7. #7
    Join Date
    Mar 2008
    Posts
    10

    Re: Okuma eccentric turning (camshaft)

    Hi
    Please see attached file.

    We plan eccentric turning after thermal treatment.

    Attachment 294966

  8. #8
    Join Date
    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    "Now we buy this machine with idea to earn working time and to increase quality."

    Larry, be carefull - in the photo you sent me, you will unbalance your machine ... what rpm do you wish to use ?
    Also, on excentrical turning, machine will get wear faster than normal.Much faster ...So, you need to order special guides and ball screw.
    A standard okuma lathe is not for mass production of excentric machining.
    Please, you need to take into serious consideration the machine wear ... if you will turn excentric non-stop, you will break it ...
    Discuss this aspect with your suplier ...

    You will find out how to program it, but also the machine must be up to the task .... this information is from my dealer
    Also, one of our machine as new had a deviation <0.003 ... after 1 year deviation got <0.05 ... and was not a mass production machine.

    So 1st be sure that what you buy is what you need ... consider asking for an official declaration that this machine can sustain this type of cutting.
    After that, you can do whatever you wish.

    kindly !

  9. #9
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    Mar 2008
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    10

    Re: Okuma eccentric turning (camshaft)

    Do you can give me dummy NC program for shaft similar to my drawing?

  10. #10
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    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    i will give you general excentric code ...

  11. #11
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    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    hello again, please excuse me if i gave to much details in 1st answer i will go faster now

    1) do you have Y axis, and, if so, what domain do you have on Y axis ? sorry, but i dont have a multus750

    2) in your original post you said "I need info about turning eccentric shaft" - so you need help only fi290excentic200 + fi480excentric120 ? and you can do without problems fi170 and fi195 ?

    3) does *.exe works on your computer ? run it under XP
    - there are 2 machinig modes 4 excentric up there
    - select one and press the "long button" [ > ]

    4) just in case, data-buffering-from-PC to machine ?
    Attached Files Attached Files

  12. #12
    Join Date
    Mar 2008
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    10

    Re: Okuma eccentric turning (camshaft)

    Sorry for delay!

    1. Yes, my machine have Y axis.
    Here are commands:
    "...
    3-3-2. Y-axis Control Commands
    Y-axis Control Mode Commands
    Use the following G codes to enter or exit Y-axis control mode.
    Y-axis Control Mode Enable command
    G138
    Y-axis Control Mode Disable command
    G136
    ..."

    2. Let's to make example only for eccentric fi290.

    3. No, this .exe don't work
    My computers are witn Win 7 Pro.

    4. We haven't direct connection between PC and machine yet. In current time we communicate via USB flash.

  13. #13
    Join Date
    Apr 2009
    Posts
    1262

    Re: Okuma eccentric turning (camshaft)

    Lary,

    As deadlykitten says, you will unbalance your machine turning this part. I think you are going to want to mill this rather than turn it. It can be done by rotating your C-axis and timing it with your XYand Z axis. This will leave you with a rougher surface than turing, but I'm thinking it will be followed by a grinding process anyway, so it should not matter too much. Does your CAD system have the ability to perform this type of operation? It will output a series of short linear XYZC commands in order to generate the eccentric path.

    Best regards,

  14. #14
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    4131

    Re: Okuma eccentric turning (camshaft)

    hello, i create a movie with the *.exe file at work. Because of the screen recorder, it plays too fast, so please watch it at 0.5 speed.
    As you can see, there is a program that simulates excentric movements.
    One aplication of this program is that coordinates can be generated.

    My approach for your part :
    - rough miling, on mils or on multus
    - rough turning for coaxial diameters
    - rough turning for excentric diameter, using 4 jaws spindle to put excentric diameter axis coaxial with spindle axis
    - finishin/grinding exactly how you did it until now

    Please, take into consideration :
    - you can not finish your part un multus, only by turning, because for finishing you need high rpm and low feeds, and your part is excentrical and will fly out of the spindle
    - only way to finish it by turning is on coaxial diameters, and not on excentric, only if your part weight is 5..10% of machine capacity ...
    - excentric diameter should be finished by grinding, and multus is not a grinding machine
    - only way to finish excentrical diameter on multus is that you need a fi340 at least grinding wheel, and grinding wheel weight must be 5..15& of machine tool capacity, also with step-by-step acceleration and not sudden stop
    - please, verify this :
    - machine limit load on spindle ( how much weight can it suport )
    - live center load
    - maxim tool weight
    - tool rotation should start easy (0 .. 50 .. 100 ... 2000 ) ... and not to stop sudden ...
    - maxim rpm for tool

    Maybe you are an expert. Please send me a video with the operation that you wish to do on multus.
    I can generate code anytime, but i dont understand why do yo wish to turn excentric ? you mill excentric, you can "grind"40%, but not turn ...
    Maybe i dont understand.

    If i send you turn code, so to machine excentric without rotating tool, is not profesional.
    Please, dont get me wrong, maybe i did not understand.

    I can give you code for excentric :
    - please send me a drawing before multus
    - please send me a drawing how you want it to be after multus ...

    I just want you to be safe .... kindly ... also, please fell free to post questions into "CAM Software" forum

  15. #15
    Join Date
    Mar 2008
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    10

    Re: Okuma eccentric turning (camshaft)

    Hi Deadlykitten

    Thank you for information that you share.
    Maybe I not explained properly. I don't plan to use NC program (generated from you) for manufacturing of detail.
    I need this NC program, because I want to see right, working syntax, because at current moment I can't to write working program and I can't to find this info from official channels!
    Local OKUMA dealer tell me that this operation is imposible at OKUMA!!! But as I see at Youtube, this is posible!

    This is first task...
    All manufacturing limitations for this shift are second task...

  16. #16
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    Re: Okuma eccentric turning (camshaft)

    hy larry, send me the youtube video with the operation you have in mind, and i will explain you very clear how to code that

  17. #17
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    10

    Re: Okuma eccentric turning (camshaft)


  18. #18
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    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    hi, please wait a few days. i am busy now ... i will give you nice material,but i need time :P

  19. #19
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    Jun 2015
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    4131

    Re: Okuma eccentric turning (camshaft)

    hi, please see attached file ...
    Attached Files Attached Files

  20. #20
    Join Date
    Jun 2008
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    372

    Re: Okuma eccentric turning (camshaft)

    This CAM turning is done with a CAM turning attachment not standard Gcode on a standard machine

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