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  1. #1
    Hi all,

    My Denford Cyclone Lathe has started making a loud buzzing noise. Opened up the cabinet but cant quite identify where it is coming from...'

    Does anyone recognise the noise?

    https://youtu.be/BHNFS_2o02M

  2. #2
    while I have not worked on a denford machine I have to ask

    what motors are running ?

    since the spindle and axis drives are stopped

    I guess you have a coolant pump and either hydraulic or pneumatic compressor running ?

    switch them all off and if the noise stops
    then turn one on at a time to find which is making the noise

    John

  3. #3
    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.
    You have tried opening the electrical cabinet and having a listen?

    Videos aren't that good at helping identify sounds, but it sounds like either a motor rattling (cabinet cooling fan?) or a relay chattering.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  4. #4
    No noise coming from the electrical cabinet so don't think it is a contactor or relay. I took the side cover off and the noise seems to be coming from the spindle motor. Running the spindle doesn't affect the sound at all which seems strange, I think I am going to have to take the internal sliding covers off to have a closer look at the motor.

  5. #5
    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.
    Could be the cooling fan for the spindle motor.
    If it's similar to mine (mine was a denford controller version), the spindle motor will have a forced cooling fan fitted, which I think runs whenever the machine is powered up and no e-stop/limit triggered.
    And having just checked the wiring diagrams I've got, it is controlled by the main MDC contactor (I can't find the diagram, but I'm pretty sure that's powered via the E-stop relay), and has it's own dedicated circuit breaker labelled SMF. Flipping the SMF to off will soon tell you if that's the problem.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  6. #6
    Couldn't find that breaker in mine, don't suppose you could send me the wiring diagram that you have could you?

    Think it is definitely the fan though, I can feel it vibrating when put my hand on it.

    Click image for larger version. 

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  7. #7
    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.
    I wonder if the fan's fed from somewhere else on yours.

    Fanuc OTA diagrams can be found at http://denfordata.com/bb/viewtopic.php?f=15&t=2337
    However, I just looked at this set - http://denfordata.com/bb/viewtopic.php?f=15&t=2508 and the spindle fan is single phase powered via Fuse 4. However those machines appear to have 3 phase + Neutral input, whereas the older ones were only pure 3 phase. Do you know what power input your machine has?
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  8. #8
    I have the 3 phases and the neutral on mine, removing F4 fuse didn't stop the fan. But removing the F2 fuse did though. Now just got to find the time to remove those internal sliding cover/panels to see whats going on.

    Thanks for your help so far.

  9. #9
    Found the culprit, it is this spindle cooling fan, no obstruction and it only makes the noise at high rpm. Are these serviceable or do i need to buy a new one?

    Click image for larger version. 

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    Click image for larger version. 

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  10. #10
    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.
    Searching the model, turns up the original on RS - http://uk.rs-online.com/web/p/axial-fans/2584718/ but it's discontinued, and they list this - http://uk.rs-online.com/web/p/axial-fans/6196860/ as a replacement.

    Might be best to double check measurements though.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

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