I have a bunch of different fans from 5V to 24V, but I fear they may not move enough air to keep the spindle cool. I tried running it at 100% for 10 minutes with a 24V muffin fan on the side but it still got up to 60°c... Which I am guessing is too much.
The existing fan is so extremely off center, that there is no way I could re-balance (maybe possible for someone else, but I certainly can't). I printed a fan, unfortunately the diameter in the center was too small, and drilling it out also made it slightly lopsided, so I will reprint one with a larger diameter today.
But I still would rather watercool it. It is insane how quiet it is without a fan.
or use the 24v fan but epoxy a finned heat-sink onto the side of the motor.
or drill larger holes in the motor case to get more airflow through the motor, or 3-d print a better shroud to suck air through the motor.
i'm not so sure 60C outer case temperatures are such a bad thing. how much air is flowing through the motor vs flowing around it cooling the case?
Could of had a new correct fan blade made for that motor shipped in from China by now. Put on a muffin fan and use until the correct one comes in. When the machine is running your shop vac or dust collector will make more noise than your spindle motor.
Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP
I have been looking for curved heat sinks, but have not found any. The Motor case only has a single hole with a diameter of approximately a centimeter on the top. There is no outlet on the bottom. I am not certain That the hole even has much purpose... I suppose adding an outlet to the bottom could improve the cooling.I suppose I could funnel the air into the inlet directly?
Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP
If you are using the machine for pcb manufacturing, you could
also go with a 'real' spindle with much higher rpm and probably
a lot better specs which you would need for those tiny bits
anyway instead of trying to fit a square peg into a round hole.
Here is a water cooled one:
https://www.ebay.com/itm/800W-1HP-CN...wAAOSwme1bu4IN