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  1. #1
    Join Date
    Nov 2018
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    Slightly left of Vernon, BC Canada
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    61
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    75

    Default How do I remove the fan from a 260 motor? All the blades are broken.

    Well as I continue to restore my pair of 260s I am now faced with the probable work of a deviant student who stuck a screwdriver in the back of the motor and broke off all the fan blades while it was running. I don't see how else they could all break off so neatly.

    I matched up all the blades, numbered them and epoxied them all back on, but the balance is off now and I am not happy with the vibration in the motor, so I need to remove the fan and find a new one or put an external fan on the end of the motor. I know I can destroy the old fan to remove it but I would like to balance this one or find a replacement as a first option.

    Could someone please let me know if this fan threads on or is a friction fit? It is a composite material, probably quite brittle now and I don't want to chance breaking it further in case I need to still use it, by balancing it.

    Thanks for any insight.

    Cheers
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  2. #2
    Join Date
    Oct 2004
    Location
    Glen Forrest, Western Australia
    Age
    62
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    80

    Default

    It looks to be a friction fit and you can use a small two leg puller through the two holes in the blade. You could also get a replacement fan from a motor re-winder

    Rick

  3. #3
    Join Date
    Nov 2018
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    Slightly left of Vernon, BC Canada
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    Thanks Rick

    I thought puller as well, but unless it has a steel core hub, I think it will just break apart, just a gut feel.

    I will try local motor rewind place as well, we have 1 in town, would be great if they had something that would work.

    Cheers

  4. #4
    BobL is offline Member: Blue and white apron brigade
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    Smile

    If it’s only a 1500rpm or thereabouts these fans are also easy enough to make.

  5. #5
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Kilohertz, Guys,

    That looks like a continuously rated motor, a totally enclosed motor. Plastic fans are quite common and replacements easy to get. You might have to open the hole in a new fan to fit the shaft. Or just fit an electric one.

    Many motors intended for VFD use have electric fans that run continuously as long as power is applied and they are usually fed directly from the mains supply before the VFD with the main motor fed from the VFD output.

    The idea being that no matter how slow or fast the motor runs, there is always full cooling applied.
    Best Regards:
    Baron J.

  6. #6
    Join Date
    Oct 2004
    Location
    Glen Forrest, Western Australia
    Age
    62
    Posts
    80

    Default

    Quote Originally Posted by Kilohertz View Post
    Thanks Rick

    I thought puller as well, but unless it has a steel core hub, I think it will just break apart, just a gut feel.

    I will try local motor rewind place as well, we have 1 in town, would be great if they had something that would work.

    Cheers
    If they break apart then they have gone way past their use-by date, but seriously I have pulled numerous ones off with this method.

    Rick

  7. #7
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Tjey are friction fit. Use the end shield to pull the fan and end shield off as one

  8. #8
    Join Date
    Nov 2018
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    Slightly left of Vernon, BC Canada
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    Default

    Well Rick wins the prize! I used my little 2 jaw puller and it popped right off. I had to enlarge the holes to get the jaws in but it worked.

    And I am glad I got it off intact, it's not the fan that is out of balance. I tried it without the fan and it still wobbles at several speeds so I took off the pulley, same thing and same frequencies. So without pulley or fan I get a large resonance at 25 Hz and another at 59-60Hz. In the big picture I may be chasing something that won't make a hill of beans difference, but it still bothers me that something is out of wack in the motor.

    Thinking maybe I had the wiring goofed up I swapped L2 and L3, and the thing still works fine?? Draws the same current as before, spins the same direction...I guess I don't know much about 3 phase. I thought something would be fighting itself with one phase reversed.

    Anyway, here is a video clip of the motor at various frequencies.

    So what are your thoughts? Leave it, it's normal, continue disassembly to determine what is out of wack, buy a new motor?

    Cheers

    https://www.dropbox.com/s/gaizj4fo90...motor.wmv?dl=0

  9. #9
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Kilohertz View Post
    Well Rick wins the prize! I used my little 2 jaw puller and it popped right off. I had to enlarge the holes to get the jaws in but it worked.

    And I am glad I got it off intact, it's not the fan that is out of balance. I tried it without the fan and it still wobbles at several speeds so I took off the pulley, same thing and same frequencies. So without pulley or fan I get a large resonance at 25 Hz and another at 59-60Hz. In the big picture I may be chasing something that won't make a hill of beans difference, but it still bothers me that something is out of wack in the motor.
    Thinking maybe I had the wiring goofed up I swapped L2 and L3, and the thing still works fine?? Draws the same current as before, spins the same direction...I guess I don't know much about 3 phase. I thought something would be fighting itself with one phase reversed.
    This should have reversed the direction of the motor. The phases can be connected in any order and it should run. Then reversing any two phases should reverse the direction of the motor.

    Anyway, here is a video clip of the motor at various frequencies.
    So what are your thoughts? Leave it, it's normal, continue disassembly to determine what is out of wack, buy a new motor?
    https://www.dropbox.com/s/gaizj4fo90...motor.wmv?dl=0
    Was the motor on a level surface? if it is at all able to rock then I wouldn't think that rattle isn't all that bad.
    Try it again with the motor bolted down.

  10. #10
    Join Date
    Nov 2018
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    Slightly left of Vernon, BC Canada
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    Quote Originally Posted by BobL View Post
    This should have reversed the direction of the motor. The phases can be connected in any order and it should run. Then reversing any two phases should reverse the direction of the motor.
    I'm going to have to check that again, I was sure it was spinning the same direction, and I have been so careful to get L1, L2 and L3 always correct from the VFD.

    Quote Originally Posted by BobL View Post
    Was the motor on a level surface? if it is at all able to rock then I wouldn't think that rattle isn't all that bad. Try it again with the motor bolted down.
    It was sitting on the chip tray behind the ways,right next to the headstock....it's as far as the wires would reach from the back of the machine. It was just sitting there free to wiggle about on it's own, not bolted down. When I picked it up, I could feel the wobble, like the armature was out of balalnce. I thought all the vibration couldn't be good for finish quality on turning, but again, I may be over thinking this.

    I'll try again tomorrow, and then just install it and try the lathe, it will probably be fine.

    Thanks!

  11. #11
    Join Date
    Nov 2007
    Location
    melbourne australia
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    Quote Originally Posted by BobL View Post
    This should have reversed the direction of the motor.
    Yep!
    Chris

  12. #12
    Join Date
    Nov 2018
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    Slightly left of Vernon, BC Canada
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    Quote Originally Posted by BobL View Post
    This should have reversed the direction of the motor. The phases can be connected in any order and it should run. Then reversing any two phases should reverse the direction of the motor.


    Quote Originally Posted by jack620 View Post
    Yep!
    Senior moment! Damn, I hate getting old. Tried it again today and sure as shxt it reverses when I swap L2/L3.

    Then I reinstalled the fan, then the motor, new belt, connected everything and ran it....It runs fine, I can still feel the resonances at the same freqs but as it is mounted to the lathe now, much reduced, and probably not worth chasing any further.

    Thanks all for your help....really great bunch of people here and I certainly appreciate the guidance.

    Cheers

  13. #13
    BobL is offline Member: Blue and white apron brigade
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    Just realised where you hail from - Nice area!
    I spent 3 months working in Calgary in 2010.
    On the way there we took the Rocky Mountaineer from Vancouver and spent most of our weekends in BC and several weekends at a place called Lake Wasa. On Google maps it looks like only a couple of hundred km from Vernon but the map directions say 500+km and about 6 hours away. I guess that mountains for ya.

  14. #14
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    Make up some washers say 1/4" thick from some insertion rubber (rubber with a cloth belt inside it). That will cut down a bit on transmitted vibration.

    Michael

  15. #15
    Join Date
    Nov 2018
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    Quote Originally Posted by Michael G View Post
    Make up some washers say 1/4" thick from some insertion rubber (rubber with a cloth belt inside it). That will cut down a bit on transmitted vibration. Michael
    Excellent idea! I have some suitable material, a commercial truck mud flap, and some old conveyor belting. Easy to just cut out a square to fit the mounting plate and drill the holes.

    Cheers!

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