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  1. #1
    So I've got a small CNC machine (30 x 20), it's got a water cooled spindle (which I've not used yet)...but frankly the thought of tubes running back to a large bucket, which will no doubt get contaminated seems excessive (bearing in mind my CNC machine is located in - what was meant to be - our dining room!


    So I seek a compact & silent (ok, perhaps silent is stretching it ....let's say very low noise) solution ....something that's a closed loop (so I don't have to worry about contamination). So I;m browsingebay (as you do) & found this....

    New Silent 23DB Water Cooling Circulation Pump For Spindle Motor CNC Router | eBay

    ...ok, yep, a Chinese seller & as usual, this isn't so much an advert, more of a teaser for you to try & piece together th puzzle. So to my question....would this suffice for cooling an 800W spindle? Would it even be suitable? Would it need a cooling rad to be used in conjunction with it? (I should perhaps mention that the machine isn't on the go for hours - probably maximum session is about 40 minutes...and even then the spindle isn't be overly taxed...probably running at 10,000RPM milling a PCB or cutting a bit of acrylic.

    Many thanks,
    Hank.

  2. #2
    I been having a bit of a read of the Chinese spindle thread and from what is being said there the cooling requirements aren't that hard to meet.

    I'm currently thinking of mounting a radiator on the back of my gantry with a small pump on top thus limiting the pipe run and total water volume. I was thinking I'd probably use a modified computer cooling system. As Jonathan mentions in this post the dissipated heat is probably of the order of 110W max. Cooling systems for CPUs have to be able to deal with 80W and probably quite a bit more because people using water cooling are often over clocking. If you are willing to run with a reasonable delta temperature (between ambient and radiator) passive cooling should be quite easy. If you want a smaller delta then a 12V computer fan run at 7V would provide good air flow over a radiator and be essentially silent.

  3. #3
    If the system is closed loop, then without a reasonably large tank you will certainly need a radiator of some sort. The easiest option is just to use the parts people use for computer water cooling systems, but the parts for that market tend to be overpriced so unless you can get lucky on eBay I'd substitute them for cheaper options, e.g. the pump you found and a car radiator with a fan for the heat exchanger. I don't think you'll get away without a fan unless you have an unreasonably large heatsink.

    It's been done before:
    Spindle Water Cooling System Test Start - YouTube

    That system looks nice and light.
    Last edited by Jonathan; 03-09-2013 at 11:00 AM.
    Old router build log here. New router build log here. Lathe build log here.
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  4. #4
    Quote Originally Posted by Jonathan View Post
    If the system is closed loop, then without a reasonably large tank you will certainly need a radiator of some sort. The easiest option is just to use the parts people use for computer water cooling systems, but the parts for that market tend to be overpriced so unless you can get lucky on eBay I'd substitute them for cheaper options, e.g. the pump you found and a car radiator with a fan for the heat exchanger. I don't think you'll get away without a fan unless you have an unreasonably large heatsink.

    It's been done before:
    Spindle Water Cooling System Test Start - YouTube

    That system looks nice and light.
    The pump in that youtube video looks like the same item I linked to in my first post (which is quite cheap) ...

    DC12V SC-300 Silent 23DB Water Cooling Circulation Pump For Spindle Motor Router | eBay


    just where to buy the radiator with integral fan, I found a radiator that seems well priced (so might just lob a quiet fan onto it)....

    Aluminum Water Cooling Block Water cooled Row Heat exchanger For PC Computer 90 | eBay


    I'm ideally seeking a solution that can be mouted on the rear of the gantry of a 3020 machine (fixed gantry type)

  5. #5
    I wouldn't worry about getting an integral fan with the radiator. Fans are cheap and you'll probably want a half way decent "ultra quiet" one (something like this).

  6. #6
    No need for radiator. Just a waste of money. 1000l/ph pump + 5l car radiator fluid+ big transparent 5l jar from any chinese shop + transparent plastic hoses. Again, anything else is a waste of money. Thats for 0.8kw spindle. 15l have to be ok for the 2.2kw one.

    -Water cools also in the plastic tubing on its way
    -The tubing should be transparent so you can see eventual bubles
    -the car liquid takes away heat better/glycol/ and will not spoil with time/at least for an year, later-yes/
    -the car cooling liquid has a color so you can spot leaks
    -the jar should be transparent so at all times you see the flow

    Never had any problems with this setup doing more than 8h continuous machining.


    This is the correct pump 75W Water Pump spindle motor water-cooled circle pump For Engraving machine CNC | eBay

    I bought the same locally for 20euro but this one is better because of the brass fitting.

    Hope it helps.
    Last edited by Boyan Silyavski; 03-09-2013 at 03:01 PM.

  7. #7
    Quote Originally Posted by silyavski View Post
    No need for radiator. Just a waste of money. 1000l/ph pump + 5l car radiator fluid+ big transparent 5l jar from any chinese shop
    In most circumstances, that's true, but if you're trying to get away without a tank a radiator is certainly needed. For my 2.2kW spindle I have a tank which is filled with about 8L and it's not really enough for more than a few hours. Clearly it depends on how much power you're drawing from the spindle, but 5L of fluid will only be able to absorb the heat for a very short amount of time if the spindle is used at anywhere near rated power. You must be using only a fraction of the rating to get away with 5L.
    In Hank's case it's a small spindle on a small machine, so it might be acceptable.

    There are plenty of cheaper pumps on eBay...
    Last edited by Jonathan; 03-09-2013 at 02:53 PM.
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  8. #8
    Quote Originally Posted by Jonathan View Post
    In most circumstances, that's true, but if you're trying to get away without a tank a radiator is certainly needed. For my 2.2kW spindle I have a tank which is filled with about 8L and it's not really enough for more than a few hours. Clearly it depends on how much power you're drawing from the spindle, but 5L of fluid will only be able to absorb the heat for a very short amount of time if the spindle is used at anywhere near rated power. You must be using only a fraction of the rating to get away with 5L.
    In Hank's case it's a small spindle on a small machine, so it might be acceptable.

    There are plenty of cheaper pumps on eBay...

    Sorry, forgot to say 0.8kw spindle, so like you say multiply by 3 the water amount. Will edit now my post.

    However my water doent heat at all obviously because of the long hosing/ i have it run inside the cable chain guides.


    I encourage greatly liquid versus radiator. One more thing to fail/fan/.

  9. #9
    I've got a car screenwash tank with inbuilt pump. I planned to run it at 6V or so as it's not meant to run continuously, and running at 12V I think the flow will be way more than needed.

    Only problem is how to attach a return connector to the top, and making a wooden crade for it. If it proves too difficult (maybe it's polypropylene which won't glue) I might try using a small car header tank and I've got a small brushless pump which will be fine for continuous duty.

  10. #10
    Quote Originally Posted by richie00boy View Post
    I've got a car screenwash tank with inbuilt pump. I planned to run it at 6V or so as it's not meant to run continuously, and running at 12V I think the flow will be way more than needed.

    Only problem is how to attach a return connector to the top, and making a wooden crade for it. If it proves too difficult (maybe it's polypropylene which won't glue) I might try using a small car header tank and I've got a small brushless pump which will be fine for continuous duty.
    Hi,
    in fact i did just the same at the beginning. It will heat and eventually break. I had a Mercedes screenwash water tank and VDO brand pump. I fixed a PC cooler fan on the pump and run it at 6v. One day it broke. It heated a lot and made a lot of noise.

    Its up to you but if you go to a local pet store for 20eur you can have a perfect 1000lph pump, if you dont want spending 32euro on the ebay one/3000lph/.

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