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IndustryArena Forum > CNC Electronics > CNC Machine Related Electronics > Fundamentals Book Recommendations
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  1. #1

    Post Fundamentals Book Recommendations

    Hello,

    I am looking for recommendations for a book, website, etc. to get started learning the fundamentals of cnc controls/electronics.

    When learning a new topic, I have found asking the right question is the hard part. I'm a mechanical engineer and DIY enthusiast, so I have some basic electronics knowledge...
    Trying to describe what I do know is useless so I will describe the problem I am trying to solve and hopefully that will help with pointing me in the right direction.
    Note, that I am not looking for answers to this project.

    Project: I am installing a Centroid Oak board into a Hitachi Seiki Lathe HT23r, the lathe has CACR-SR30SF servopacks and I am specifically interested in
    wiring the CN1 harness from the Oak board to servopack. I have the schematics for the board and the servopack, however the terminology each uses is different and
    figuring out which pins to connect is not obvious.

    Even if I am not able to solve this issue, I would like to learn more about how the servopack works and be able to describe what the CN1 pins do.

    Thank you,
    -Jason

  2. #2
    Join Date
    Dec 2013
    Posts
    5717

    Re: Fundamentals Book Recommendations

    An ambitious project I have found lathes are an order of magnitude more difficult to upgrade than milling machines, but I have only done one lathe.

    There are a number of books/web pages on how servo systems work. You might take a look at this page for a starting point White Papers | Galil

    There is no standard nomenclature for the drive/controller I/O, each manufacturer has there own naming conventions, however, there are things that you expect to see that are common to all.

    On the drive (amplifier) end you will find input(s) for a control signal(s). This could be analog, step & direction, PWM, or direct digital control, also at the very least there will normally be an enable input. Other inputs might include reverse rotation inhibit, run and stop signals, and other stuff. Then you might find encoder outputs, alarm outputs, and other various outputs.

    On the controller end you would find the mating inputs and outputs for the above signals. Typically the analog control signal is +/-10V, the other signals may be 5 to 24V depending on the controller/drive. If your controller and drive signal voltages are not compatible, then installing relays between them is required. This is normally done with optocoupled rather than electromechanical relays.

    In your case, you actually have good documentation for both the controller and the drive so it is a matter of translating the signal names from one to the other. The drives take a +/-10V analog input and it looks like the Oak board will output that signal, There is an encoder output from the drive, this would connect to the encoder input on the controller. These items and an enable signal to the drive should get the wheels turning.

    One note of caution: Mechanically disconnect the servo motors from the lead screws until you know you have the servo motor under complete control. A runaway servo motor can do some serious mechanical damage to the hardware.
    Jim Dawson
    Sandy, Oregon, USA

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