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  1. #1
    I bought this water cooled spindle some time ago and am about to buy a water cooling system to go with it. When I asked about the radiator and pump heat rejection requirements etc. the seller helpfully suggested 'any kind of pump' to go with this system (didn't sell anything suitable himself).

    So with that less than helpful spec I'm looking for options to cool this, anyone own one or something similar? My research has shown people using PC CPU coolers, and this Thermaltake 850i seems to be working for someone:

    I've heard these spindles have a high flow resistance, and blowing into the inlet port last night confirmed this subjectively. My suspicion is that I need something which can create alot of pressure, but probably not need much in the way of flow.

    I'm tempted to go for the Thermaltake option at about 90, but anyone used anything else? Looking to buy one ASAP to get the spindle running at last!

    Last edited by routercnc; 30-08-2010 at 07:44 PM.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  2. #2
    Fishtank pump?

  3. #3
    Or even better....

    A cheapish? brushless power jet washer? although this is pressurised...might not coolit down quick enough?

    /I'll get me coat:whistling:

  4. #4
    ecat's Avatar
    Location unknown. Last Activity: 08-02-2014 Has been a member for 3-4 years. Has a total post count of 157. Received thanks 5 times, giving thanks to others 8 times.
    There is a load of stuff to choose from in the PC world and certainly for cooling a CPU the best thing to be said about the Thermaltake is, it's green.

    This may be of use..

    ... I'd guess something like this

    ... and this ...

    would out perform the Thermaltake, as would almost any of the radiators on that site + that pump.

    Add a 'T' junction and a blocked off length of tube for filling and off you go. Or you may want to add something like and a little bit of silver for luck ;)

    ... should get you stated anyway :)

    I wouldn't worry too much about flow rate, so long as there is some flow you just need to spec the radiator + fans to match your heat load at a comfortable temperature - say 30 to 35degC ?
    Last edited by ecat; 30-08-2010 at 09:50 AM.

  5. #5
    I used to use a windscreen washer motor and a large container ( sat on the cold floor of my garage (floor kept the water cold enough). This was to bench test and run in my model boat engines, on the same note you could use a small pond pump as you get decent pressure for long runs
    If the nagging gets really bad......Get a bigger shed:naughty:

  6. #6
    I've found out that these spindles are roughly 80% efficient, so clearly you need to dissipate 300W.
    Lets say you have a 10L container of water at 20C and you run it for an hour...that will rise to 46C if the container was perfectly insulated.
    I'm not at all certain about this calculation, but I'm pretty sure that that volume of water in an aluminium box would dissipate the heat fast enough.

    I've got one of these pumps and it seems good:
    Don't see why you couldn't use that with the setup I described.

  7. #7
    A bit elaborate but look here for an idea to put in line
    If the nagging gets really bad......Get a bigger shed:naughty:

  8. #8
    Thanks Guys, some useful stuff there.

    I had considered fish tank pumps, but not sure if they would be up to it. If anyone has seen one used for this application, or seen anything suggested above actually used on a spindle, I'd be interested. Same goes for fountain pumps, high flow rate but would probably get hot with the restriction in the spindle - they are not very free flowing. Some people have tried windscreen washer pumps, but they did run very hot connected to spindles. I did consider running several together, but it feels like a bodge. Probably not as quiet as a PC cooler pump either.

    Hi ecat, great stuff. Love the spreadsheet, would be great if there was a spindle option for the CPU block! I'd seen the silver strip idea to stop things growing in the water - was probably going to use a proprietary fluid of 25% proplyene glycol with anti-corrosion and anti-bacterial, but no harm to add that as well.

    I've seen alot of the Thermaltake stuff around and thought it was respected, but perhaps there are better things out there, as you suggest. Thought this post might bring out some overclockers ! Thanks for the other options, I'd also considered a simple pump, radiator and T filling junction, but also like the idea of a reservoir to give more water volume and a bit of extra cooling. More water should allow me to run longer if the radiator and pump is a bit underspec.

    So it's all a bit of a guess at the moment. These are the figures I think I'm looking at:
    1. Don't want to spend more than 90 if possible
    2. Want something to fit and forget - don't want to spend hours fiddling
    3. Probably looking to dissipate about 200W, although I'll go with Jonathan's 300W
    4. Prefer to run with a litre or so max because I'd like it all self contained near the spindle and water weighs ~1kg per litre!
    5. Don't want the pump or fan to make too much noise - otherwise I'd have been better off with the aircooled version and this project is about a quiet overall system to replace that noisy router.

    I'll do some more digging and if I take the plunge on something and it works I'll post it out in my build log.
    Last edited by routercnc; 30-08-2010 at 08:31 PM.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  9. #9
    How come you never went for the air-cooled type?

  10. #10
    Hi George,

    Two reasons. The built in fan creates extra noise, bit like a muted hair drier, and there's nothing you can do about it. Obviously nothing like a router in level, but I'm after peace and quiet. The water cooled spindles are probably about the quietest available, unless you know different. Since I'll be cutting alot of balsa (plus some liteply) I'm hoping that the overall levels during cutting will be fairly low, and I'll be able to hear the radio again. Also, for long runs I don't want to upset the neighbours.

    Secondly the exhaust air flow blows down onto the cutting area (although it could be ducted away, but you don't want to restrict the flow). This blows all the fine dust (much of which you can't see) out through your collection shoe before the vac has a chance to grab it. With water cooled there is none of this.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

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