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Type: Posts; User: wmgeorge

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  1. Replies
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    Re: GME's New 80/20 CNC Build - My Design

    A wise decision, Now get started making things! :cheers:
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    Re: GME's New 80/20 CNC Build - My Design

    It would be simple just to do a test surface say area with your spoil board bit and another area the same size with common 1/2 end mill. A test plot in both directions.
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    Re: Chinese Spindle Stalling.. better vfd?

    It will only draw 8 amps or the rated amps under a heavy load or fault condition. Amp draw is an indication of load. Try running at the rated lower speed 12,000 rpm
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    Re: GME's New 80/20 CNC Build - My Design

    Your spoil board can move X much when humidity changes?
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    Re: GME's New 80/20 CNC Build - My Design

    But if your gantry is has a .001 twist and the shims don't work, its not really going to make a difference in any work your doing.
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    Re: GME's New 80/20 CNC Build - My Design

    Beautiful work Gary, as usual.
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    Re: GME's New 80/20 CNC Build - My Design

    Going to use for Cabin Signs. Been busy lately decided to buy a used camper and take the Wyoming, Montana , Yellowstone park then up to BC, Canada to see my farming / trucking cousins. Thought they...
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    Re: Chinese 2.2kw spindle burned out?

    All the windings should read about the same, just make sure your fingers are not touching the bare prongs of the meter leads. Going from one lead each to ground on the spindle frame should be very...
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    Re: Chinese 2.2kw spindle burned out?

    I don't understand, are you trying to run the motor at 50 Hz? If so it will soon be burnt out. Minimum low speed under no load should never be less than 100 Hz. Mine is set at 150.
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    Re: Chinese 2.2kw spindle burned out?

    Mac is right, taking it apart is like opening a can of worms. Unless the bearings were rough or something inside was dragging its more than likely in your setup Parameters . Now you have it far...
  11. Re: Need to flatten 5/8" thick aluminum plate

    Chris its not a big job so nobody is interested. One user suggested grinding, I have not seen a wheel able to grind aluminum, The way I look at it, you can try to sell on maybe Craigslist locally or...
  12. Re: Need to flatten 5/8" thick aluminum plate

    It does not Need to be Level milling machine tables onboard a Navy machine shop are never level. :wave: So tram your router Z to be true with your cross bars (the ones that would hold the spoil...
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    Re: Chinese 2.2kw spindle burned out?

    mactec54 posted on #27 No confusion here, that is why they install Braking Resistor to absorb the Back EMF

    Mac I am done posting on this Thread, you change the Subject to get attention away...
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    Re: Chinese 2.2kw spindle burned out?

    Back EMF reduces the voltage and therefore current in the motor windings. A motor has coils turning inside magnetic fields, and a coil turning inside a magnetic field induces an emf. This emf, known...
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    Re: Chinese 2.2kw spindle burned out?

    Since your ground pin is not hooked up to the metal on the frame I don't understand. If you get any reading to motor frame ground from a winding its bad. Winding to winding should read the same,...
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    Your answers are typical for you, made up. The...

    Your answers are typical for you, made up. The viewers here can do their own search for EMI and back EMF and get the truth. Braking resistors are only used when stopping the motor.
    So your...
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    Re: Chinese 2.2kw spindle burned out?

    Braking resistors are used.... well they are only used when braking. Not back EMF and we were talking about EMI? FYI and others .... just one reference. ...
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    Re: Chinese 2.2kw spindle burned out?

    Never is a wire to the Ground pin #4 Chinese seem to forget. I took the picture into an editing program and lighted it a lot, it looks black but no windings??
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    Re: Chinese 2.2kw spindle burned out?

    Post a picture of the windings.
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    Re: Chinese 2.2kw spindle burned out?

    If you sent them a picture of that sorry, crappy wiring your screwed. But Mac is 100% correct you need to check the spec's of the spindle motor you buy
    and make sure your drive parameters are...
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    Re: Chinese 2.2kw spindle burned out?

    He is confusing EMI with EMF and claiming unshielded wires to the spindle caused this motor to burn out!!!
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    Re: Chinese 2.2kw spindle burned out?

    Really you should keep these thoughts to your self, as I can show you a photo of a burnt up spindle caused by back EMF and Rotor Voltage, EMI can have the same affect but normally wipes out...
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    Re: How to Wire EMI Filter for 220v VFD?

    All equipment grounds should be tied together. Power line coming in ground the green or green/yellow to frame, that tie point to the VFD ground and EMI ground.
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    Re: Chinese 2.2kw spindle burned out?

    EMI and RFI can raise havoc with control wiring to the VFD and other parts of the system, but will never damage a motor.
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    Re: Chinese 2.2kw spindle burned out?

    Huh? I thought they taught spelling in Australia? It looks like you also failed reading skills.
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