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Type: Posts; User: Al_The_Man

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  1. CNC Motion control parts, Electronic-Electrical-Mechanical.

    Selling up, many parts CNC such as planetary gearboxes, servo motors , analogue drives, electrical fusing, P.B's., Contactors, cables,Proximity sensors, hydraulic cylinder piston sensors, Opto22...
  2. Re: Building CNC Control Panels to Comply with NEC and NFPA 79

    There is an older version of NFPA79 in PDF out there, it may be still available.
    Al.
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    Re: Size for ground wires

    Every DC supply I have ever used or built was isolated from the AC supply, they are either 50hz/60hz transformer and bridge etc, or SMPS, all typically isolated.
    Therefore in all the above examples,...
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    Re: Size for ground wires

    While on the subject of safety, this is what NFPA79 has to say about E--stop, at least as far as N.A. is concerned.
    The electrical code allows for a controlled stop, where the controlled stopping...
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    Re: Size for ground wires

    Basically the same method I have always used regarding DC power supply commons.I use a section of copper bus-bar and drill and tap to take several bolts and connect all star grounds including the...
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    Re: Size for ground wires

    Yeah, there is two thoughts on this, some practice never grounding the power commons of different sections of equipment, IOW keep all power separate, and the opposing view on grounding at all times...
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    Re: Size for ground wires

    I see you are already using the DIN rail GND terminals!
    Some cable trough would have neaten'd it up a little!:)
    Max.
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    Re: Size for ground wires

    Could be.
    Mostly retro fits, PLC control panels and CNC retro fits with Fanuc and Mitsubishi, designed a few custom ones with Galil motion cards, which are a pleasure to use.
    Al.
  9. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    I have always left control inputs and encoders powered at E-stop, fortunately control such as Galil feature this, where the PID is back to the controller and non-intelligent drives can be used.....
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    Re: Size for ground wires

    One example is DIN rail mount terminals, you can get them with automatic ground to the enclosure, they are half green, half yellow, and are intended for such cables that also include a ground...
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    Re: Size for ground wires

    The Ground wire should be the same gauge as the supply conductor or same as the combined size, if supply is from difference sources.
    All ground wires should terminate at the star point or be joined...
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    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...
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    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...
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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.
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    Re: Default Spindle Speed

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

    Why absolute?
    What advantages do you see?
    And to steppers?
    Al.
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    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...
  18. 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..
  19. Re: Vectrac CNC Knee mill refit from Fanuc 0M to Camsoft

    So it is a through hole encoder?
    Al.
  20. 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.
  21. 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.
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    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...
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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.
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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.
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    Re: Mini lathe motor whining noise

    What is the nature of the motor? DC ? AC? BLDC?
    Al.
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