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Type: Posts; User: Al_The_Man

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  1. Replies
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    38

    Re: Earthing problem

    Have you set up an earth star point ground where the service GND terminates also?
    The USB power is already grounded through the PC supply, if this is a tower PC etc.
    The stepper P.S. common may...
  2. Replies
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    42

    Re: Absolute encoders

    Jeez!! all the robots that I have programmed must have been wrong, all had absolute encoders, which is the industry norm for robots (Fanuc, Mitsubishi etc)
    All continued functioning without homing...
  3. Replies
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    Re: Absolute encoders

    The only thing you may gain is not having to register zero (home) at power up.
    After this it is the same.
    Al.
  4. Replies
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    7

    Re: Default Spindle Speed

    You mean you can't edit the G code program?
    Al.
  5. Replies
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    Re: Absolute encoders

    Why absolute?
    What advantages do you see?
    And to steppers?
    Al.
  6. Replies
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    7

    Re: Default Spindle Speed

    I don't understand at all, why not edit the program G-code, S-code etc?
    What kind of CNC software does not let you program the RPM? if you do have it, set it to what you need!?
    I have also used one...
  7. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    " I'll go with that automation Direct offer, mentioned above"

    I would go with the Heavy duty version of the Koyo.
    A few more $$'s but probably worth it for that application.
    Al..
  8. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    So it is a through hole encoder?
    Al.
  9. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    You may be better off to use a through-hole encoder rather than a shaft type. (no bearings).
    Al.
  10. Re: My CNC 3 Axis machine stops working "shutting down" after few minutes

    Almost impossible to trouble shoot from a distance, you need to check all devices connected/responsible for the Mach E-stop input.
    Al.
  11. Replies
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    102

    Re: Mini lathe motor whining noise

    You can try a choke in series with the motor, but with PWM you should not normally have to do that, this is one advantage to PWM.
    It must be running a very (abnormally) low PWM frequency in order...
  12. Replies
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    Re: Motor Coupling Question

    Are these the helical versions?
    Generally it is wise to use stainless versions for servo's, the aluminum are typically reserved for encoders.
    Al.
  13. Replies
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    Re: Mini lathe motor whining noise

    Did it suddenly start this or was always there, It appears it may me a simple PWM drive, if so often the main reason is too low a PWM frequency.
    Al.
  14. Replies
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    102

    Re: Mini lathe motor whining noise

    What is the nature of the motor? DC ? AC? BLDC?
    Al.
  15. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    All of the Fanuc AC servo's I have serviced over the (many) years had quadrature encoders with 4 bit commutation tracks.
    The one concern I had was by retaining the Fanuc AC drives, I did not want to...
  16. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    Of course it was easy in the early 60's and even later, from the days of the old 6M and many that followed etc, these were all DC Brushed motors, the poster was referring to the AC servo which was...
  17. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    This shows the 4 bit output from the Fanuc commutation.and how it is interpolated.
    Al
  18. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    The problem with Fanuc AC servo's is they use a proprietary method for commutation, I have removed the encoder and fitted a through shaft version replacing the encoder with one that has BLDC...
  19. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    Re the post #8, re buzzing contactors, I went over a long time ago to 24vdc for not only control but all relay and contactor coils, the only time AC has the edge is at switch on time, after that, DC...
  20. Replies
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    Re: Hyanyang Inverter Wiring and Setup

    I think electrically with the 2 live conductors and N connected, the input is directly to a 3 phase rectifier, which means the Neutral has two reverse biased rectifiers WRT the L1/L2.
    So then no...
  21. Thread: Servos

    by Al_The_Man
    Replies
    15
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    72

    Re: Servos

    I used to retrofit using Mitsubishi CNC systems previously, the support is great. But a little pricey for DIY.
    BTW, there is none of the large or industrial CNC systems using steppers, all are...
  22. Replies
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    Re: wire requirements

    Another useful publication is NFPA79, Electrical Standard for Industrial Machinery, I think there is still a copy available out there in PDF.
    Al.
  23. Thread: wiring help

    by Al_The_Man
    Replies
    3
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    39

    Re: wiring help

    Recent post from Misumi.
    https://blog.misumiusa.com/how-to-select-a-hook-up-wire-or-cable/?utm_source=marketo&utm_medium=email&utm_campaign=weekly-blog
    Al.
  24. Thread: wiring help

    by Al_The_Man
    Replies
    3
    Views
    39

    Re: wiring help

    22 AWG wire is rated for 3amps, If referring to the control signal to the stepper drive itself, that should be a lot less than 3amps.
    Al.
  25. Kollmorgen Launch new version of their sizing program.

    https://motion.kollmorgen.com/acton/rif/18099/s-0bed-1908/-/l-sf-rpt-00O80000003ioac-5fcb:60cf/l-sf-rpt-00O80000003ioac-5fcb/showPreparedMessage?sid=TV2:hfcN1VHq2
    Al.
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