Cooling a water cooled spindle, without pipes everywhere & huge water tanks/buckets!

[Jonathan]

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.

[HankMcSpank]

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)

[Wobblycogs]

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).

[Boyan Silyavski]

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.

[Jonathan]

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...

[Boyan Silyavski]

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/.

[richie00boy]

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.