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  1. #1
    Hi Guys,

    We are thinking of buying a 2.2kw spindle for short runs a few minutes here and there for a few hours at a time . I know there is a choice of air cooled and water cooled but from what I have been reading they need to be run for so long at such a speed and then such a speed and so on. Is there one that could just turn on and off like a hand held router. If anyone can list a few of the pros and cons in basic terms over a air cooled and water cooled that would be handy.

    Many thanks

    Suesi

  2. #2
    Yep it's easy really.!

    Aircooled Cons.
    Aircooled have a Duty cycle so can't run extended periods. How long depends on make and size etc. They are also relatively noisey because they cool using a Fan just like a handheld router does.

    Pro's No external water cooling pipes etc.

    WC Pro's
    Watercooled don't have any duty cycle can run for days at time without any issues. No Fans so very quite.

    Cons's

    Needs water pump and tank for cooling if running long periods.

    Now given your short run requirements and knowing that WC spindles will quite happily run for 30mins or more without any cooling then I'd say go with WC spindle for the quiter running and if you ever do need extended period running then just add a pump and water.!!
    WC spindles don't need much cooling or fancy WC system just a simple submersible pump in sealed Tub of water works great.
    Last edited by JAZZCNC; 24-02-2015 at 09:17 PM.

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  4. #3
    Quote Originally Posted by suesi34e View Post
    . . . but from what I have been reading they need to be run for so long at such a speed and then such a speed and so on.
    I think you are referring to the bearings here. The Elte spindle I use has a start up sequence like that but it doesn't last for long and only has to be run at the start of each day. I have a small piece of gcode that runs it through the speed changes at the required intervals so I run it while getting the stove fired up. It's air cooled but I've had it running for hours at a time and it stays pretty cool, it helps that it's industrial quality. It also matters what speed you intend to run the spindle, if it's just slow rpm then you probably don't need the startup sequence but if you intend to run at 20k rpm or higher then I think it's a good thing and cheaper than changing bearings.
    Last edited by EddyCurrent; 24-02-2015 at 09:44 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

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  6. #4
    Thank you for your reply mate.
    I like the idea of a quiet spindle over a noisy hand held router! I think I may go for a water spindle I heard a quiet one on a youtube video. I just hope it goes OK!
    Thanks
    Suesi


    Quote Originally Posted by JAZZCNC View Post
    Yep it's easy really.!

    Aircooled Cons.
    Aircooled have a Duty cycle so can't run extended periods. How long depends on make and size etc. They are also relatively noisey because they cool using a Fan just like a handheld router does.

    Pro's No external water cooling pipes etc.

    WC Pro's
    Watercooled don't have any duty cycle can run for days at time without any issues. No Fans so very quite.

    Cons's

    Needs water pump and tank for cooling if running long periods.

    Now given your short run requirements and knowing that WC spindles will quite happily run for 30mins or more without any cooling then I'd say go with WC spindle for the quiter running and if you ever do need extended period running then just add a pump and water.!!
    WC spindles don't need much cooling or fancy WC system just a simple submersible pump in sealed Tub of water works great.

  7. #5
    Hi Eddy,

    Many thanks for your reply.
    Yes, I read about your routine I understand what you are doing. What you say is a help to me I will probably go for the water cooled one as due to the lesser noise. I will have to see if I can get a good deal on one I may check with you guys before I go off and make a purchase. I expect to get a good finish running at 16000 rpm so it sounds like it may not be much of a demand on a spindle.
    Many thanks
    Suesi

  8. #6
    Spindles themselves are much quieter than routers and once you have one there is no going back. However the noise of the cutting tool in the workpiece is still quite high and if this still bothers you then you need an enclosure around the whole machine
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

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  10. #7
    I complete agree with Eddy, go water cooled. I've got both, a high quality air cooled spindle on a commercial router I got +- 5 years back and a chinese water cooled spindle for the machine I'm building at the moment, so I don't have any practical experience on the water cooled one yet but I've run it several times for testing and its whisper quite in comparison. To me noise is the biggest issue with air cooled, above 16-18k rpm cutting nothing mine sounds like a fighter jet taking off, really the kind of noise that one gets allergic to over time. I think the warm up sequence is similar for both and not a big issue. Run it for a few minutes in the morning increasing rpms gradually and that's it. A little like a car in the morning, if its cold don't start it an blast away at full rpms but not an exact science either so none of the let it idle for 43.5 seconds and then slowly put it in drive and don't exceed 2643rpms for the first 4.432 minutes BS.. :-)

    The only pro I can think of for air cooled is that on mine the air exits at the bottom so depending on the kind of cut sometimes I don't switch on the compressed air nozzle to clear chips as the wind from the spindle is enough to clear it. I think the extra effort to add a tank and water pump is a small price to pay for a quieter work environment + other benefits as Eddy outlined.

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  12. #8
    Hi routercnc,

    Thank you for your msg. The spindles sound good I think that is how I will go. I don't mind the noise from the cutting tools so I will not need and enclosure.

    Thanks again

    Suesi

  13. #9
    Hi mitchejc,

    Thanks very much for your msg, what you say makes a lot of sense. I think it is a water cooled all the way! I hope I can easily change the speed as need by via a control as it will not be on a CNC so there will be no code or macro to do that.

    Many thanks

    Suesi

  14. #10
    I've just had a quick look at a Chinese vdf manual and it looks like you can use a digital input to select different acceleration ramp speeds. So in theory you could have a switch somewhere that would select a slow ramp so that the vfd would slowly increase it's speed over time. Then you just switch it back to normal operation.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

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