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  1. #441
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    A quick test cut. Looks like Ill be ordering more tool holders. Happy with the initial results. My Z is fairly heavy however (As predicted), might need to look at changing the gearing on both X and Z axis now.


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  3. #442
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Ah, braking resistors. Even on my 4KW spindle, I keep getting issues where when I stop the spindle, my VFD goes into overvolt trip. Pain in the ass. Anyone have a view on what size resistor I need for the Hyanyang VFD for this spindle?

    Thanks

  4. #443
    Quote Originally Posted by Chaz View Post
    Ah, braking resistors. Even on my 4KW spindle, I keep getting issues where when I stop the spindle, my VFD goes into overvolt trip. Pain in the ass. Anyone have a view on what size resistor I need for the Hyanyang VFD for this spindle?

    Thanks
    Is there not some setting in the vfd to ramp the speed down say over about 4 secs
    ..Clive
    The more you know, The better you know, How little you know

  5. #444
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Quote Originally Posted by Clive S View Post
    Is there not some setting in the vfd to ramp the speed down say over about 4 secs
    Ive tried that. All settings, unless I put it on something like a 40 seconds rampdown, it trips.

  6. #445
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,791. Received thanks 189 times, giving thanks to others 5 times.
    Download a manual for a decent brand of VFD, which actually lists braking resistor sizes, and see what they recommend for a similar sized VFD/Motor combination.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  7. #446
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Quote Originally Posted by m_c View Post
    Download a manual for a decent brand of VFD, which actually lists braking resistor sizes, and see what they recommend for a similar sized VFD/Motor combination.
    Thanks, will try that.

  8. #447
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Some research done. Seems the Chinese VFDs dont come with the internal circuitry to use a braking resistor. Will need to clarify that first.

    From what I can tell, values are between 30 - 70 Ohm and around 300W.

  9. #448
    totally not jealous....

    Serious machine you have there Chaz. You must be chuffed!

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