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  1. #16
    Join Date
    Mar 2017
    Location
    Brisbane
    Posts
    245

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    Thanks peeps, it looks like I've circled back around to a rotary phase converter being the best option.
    Solar type power seems too expensive, the batteries are only 1 part of that. Someone online recommended 'sunny island' equipment which gets very pricey. Perhaps a 2nd hand system though? Maybe in the future.
    Generators seem to be slightly more expensive than rotary phase converters for good ones.

  2. #17
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi J3dprints,

    Quote Originally Posted by j3dprints View Post
    Thanks Baron, any rough idea on price for a generator that could be relied upon to not fry my electricals?
    I'm in the UK, so I have no idea of costs in AU !

    Certainly there are places here that hire out big generators, but again I've no Idea of costs. I know that several have been stolen not too far away, that were used during the flooding not long ago.
    Best Regards:
    Baron J.

  3. #18
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
    Posts
    654

    Default

    With your 2 x 15A outlets on a common circuit, are you certain of the wire size and breaker size installed. My concern would be that it is a 15A circuit that has has a second 15A outlet added at some stage for convenience, i.e two outlets so the user does not need to run extension cords or swap leads around to run different equipment. Perfectly OK to run a 15A device for a period, then use a different 15A device connected to the alternate outlet, but maybe not OK to run them both together, unless the breakers and house/shop wiring were installed specifically with that in mind, for example being able to run a big table saw and a big dusty together.

    Even if you have an adequate capacity circuit, from the data you supplied 12KW is way more than you can safely pull from a 30A circuit (about 7KW). I don't know much about household power feeds around Brisbane, but recall seeing comments that much of the earlier builds around there had 60A household installations and supply/pole fuses. If this was the case for the place you currently live in, you would need to commit almost all of the available supply power to operating the machine, based on the consumption specs you posted. The small amount of reserve you would retain would probably disappear in forced ventilation systems to maintain working conditions in the workshop the machine is located in, unless your home has a very large room. 12KW of machinery produces a lot of heat.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  4. #19
    Join Date
    Sep 2009
    Location
    Newcastle
    Posts
    341

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    Unlikely you will come anywhere near to using the full potential wattage of your servos, and certainly not all at the same time.

    The rule of thumb used for stepper motor power supply sizing for a 3 axis cnc machine is a powersupply 2/3rds the amperage of the nominal stepper values. E.g. 3amp steppers x3 = 9amp nominal, 6amp supply is enough.

  5. #20
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Quote Originally Posted by j3dprints View Post
    Rental property.

    but that may still be the best option. After all if you paid for it and leave it when you leave the owner may let you do it?..after all it could be considered a desired improvement. Its not as though you knocking a wall out or anything like that.

  6. #21
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    If you run it from a diesel alternator, you’ll be up for around 18k for something with a decent quality motor like a Kubota, Yanmar, or Mitsubishi in a silencer enclosure (which you absolutely need In a residential area).
    I just watched the AvE video of him machining a copper mallet head on his HAAS, the run time was around 45minutes or so and the machine was full noise most of the time. At full noise your machine will consume around 20 litres or so in an appropriately sized diesel alternator.
    Hope that helps

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