EDM RAM - Mult Machines Take different Times to Run Same Job
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    Unhappy EDM RAM - Mult Machines Take different Times to Run Same Job

    Hello all. Relatively new to EDM. I am running (3) identical Mitsubishi FP80V RAM's. One of them takes at least 20 minutes longer to run the identical job. Even Mitsubishi can't figure out why. So I am doing the SMART thing and going to the experts! Any ideas would be appreciated.

    Thanks!
    Scott

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    Default

    Slightly different flushing conditions - stronger (or weaker)electrolyte pump?

    Slight difference in cutting current calibration

    Slight difference in servo loop parameters or response

    Check work tank temperatures are the same

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    Epack settings, machine conditions, material, power supply, power service. There's a large amount of variables.

    What are you burning?

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    How are you holding the workpiece? A magnetic chuck holding
    the work can create havoc.

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    Quote Originally Posted by jdd View Post
    How are you holding the workpiece? A magnetic chuck holding
    the work can create havoc.
    I've never seen a mag Chuck effect the erosion...

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    Hell, I`ve seen the same job on the same machine vary more than that. It is what it is,make sparks!

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    Not magnetic. Fixture clamped in solid.

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    Quote Originally Posted by slevine98 View Post
    Not magnetic. Fixture clamped in solid.
    What are you burning?

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    I am burning Tantalum.

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    Quote Originally Posted by slevine98 View Post
    I am burning Tantalum.
    Interesting, I used to burn pourous tantalum.

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    Hi Scott,

    I might be of some help, but sorry, not here… way too much info. So much in fact, it’s an entire article that can be found in the Winter issue of EDM Today magazine that should be arriving any day.

    The article describes how 4 CNC sinkers within a production cell were tuned to perform within a 5% differential. This means that in a 1 hour burn, all 4 machines will finish within 3 minutes of each other. This process isn't difficult, but it is quite involved as the article will reveal.

    Request: If you follow the article's instructions, come back and let us know your results.

    Bud Guitrau

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    Scott,

    Another item to consider is the condition and vintage of the di-electric oil that is in each machine.

    Do you know the type and age of fluid in each of your machines?

    If you are using a traditional petroleum base fluid, it will have a definitive useful life regardless of age. Think of this type of fluid like milk that has a set expiration date. As the fluid ages, its di-electric properties change, which can dramatically affect cycle time.

    - Brian

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    Brian,

    A good observation (as usual). Thanks!

    All of the variable aspects of dielectrics, including vintage have their own section within the upcoming article. Nevertheless, I would appreciate any constructive criticism from you or any other readers on adding or improving any suggestion(s) described within the forthcoming article on "Production Sinker Performance".

    Help us help each other, which is the basic tenet and purpose of this EDM forum. Thanks for this, Practical Machinist.

    Bud Guitrau

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    Default Curious

    Hey Scott,

    Have you made any consistency improvements to your EDM cell? Curious about what you may have tried and what results were made.

    Bud


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