Hi everyone! We’ve been putting our OmioCNC x8 to good use this season and wanted to share a water cooling solution for our 2.2kW router spindle that doesn’t involve a bucket of dirty water. During some of our off-season testing, we discovered that the bucket of water quickly became “heat soaked,” causing the spindle to heat up significantly during long jobs. I picked up some PC water cooling hardware for cheap online and put together a simple cooling loop that lives on the CNC gantry. The entire system is self-contained, so there’s no need for a bucket or AC pump. Even after long jobs at max RPM, the spindle is kept warm to the touch.
Below is a list of all the components I used to set up the cooling system, minus some electrical connectors and a DC power supply to run the fans and pump. This list is by no means perfect. Other than the radiator, most of the list can be substituted for comparable components. I chose this radiator specifically because it has the reservoir built in, eliminating the overhead of adding another element to the loop. Note that air is blowing through the radiator toward the gantry. We chose this airflow direction since it forces all swarf that would’ve otherwise been stuck on the back side of the radiator (if the airflow was reversed) to pass through the filter. This airflow direction also has the side-effect of keeping swarf away from the space between the gantry and the radiator.
- Metric M8 M8X1 Male to Barb Hose ID 1/4” 6mm Brass (Qty 2) (link)
- 120mm Fan Filters (link)
- Mayhems XT-1 Nuke Clear Concentrate Coolant 100ml - This was the coolant with the longest “lifetime” I could find. Any coolant will likely work, honestly. (link)
- Tygon 2475 Ultra Chemical Resistant Plasticizer Free Tubing - 1/4" ID (3/8" OD) (12ft) (link)
- Swiftech MCR220 “Quiet Power” 2 x 120mm Radiator w/ Reservoir (link)
- Phobya DC12-260 PWM 12V Water Cooling Pump (link)
- Koolance G1/4 Thread 1/4" x 3/8" (6mm x 10mm) Compression Fitting (Qty 2) (link)
- Koolance 1/4" (6mm) ID G1/4 Threaded Angled Nozzles Pair (Qty 2) (link)
- Scythe Ultra Kaze 120mm x 38mm Fan - 3,000RPM (Qty 2) (link)
Total cost was about $200 shipped. The price may seem kind of high for a something that already works “good enough,” but we feel the cost outweighs the benefits. We no longer have to empty the bucket of nasty water every week, clean the water cooling loop that runs through the spindle, worry about mold, algae, or rust, or risk overheating the spindle. The coolant is designed to kill bacteria, mold, etc. that may begin to flourish in the lines and keep rust from forming inside of the spindle, so now if I want to cut something, I just turn on the DC supply and start cutting. No mess, no fuss.
Hope this helps!
Here are a few more pictures of our setup (also, don’t hate on my zip tie hose clamps, they work well enough):