water cooling options for spindle

[routercnc]

Hi ecat,

Thanks for the info, like the kit at the end but trying to spend less than that if possible. I've done some calcs to get used to the sort of numbers involved in all this, and came up with this quick spreadsheet to work out how long it would take to heat up a certain quantity of water (assuming no heat loss from the reservoir).

I also had another look at the inlet and outlet barbs screwed into the end of the spindle. Given that 3/8" (~10mm) ID pipe is quite popular for CPU cooling, I was disappointed to find the following rough dimensions on these barbs:
The thread into the spindle end itself is around 7-8mm (I've emailed the supplier for the exact size)
The barb which screws into this thread has a hole around 4.5mm at one end, and a hole about 2.5mm where the pipe connects.

This is quite a reduction! I repeated the 'blowing into it test' with and without these barbs connected and it made a big difference. When I find out what size thread these barbs are they are going to be replaced! If they are G1/4 (popular CPU cooling size), I'm hoping I can put some proper cooling mod parts in instead and increase the hole size from 2.5mm to 10mm at the pipe end.

Failing all that I guess the spindle endplate could be removed and the holes re-tapped. Feeling much better about this now since the flow will be so much better if I can open these restrictions up.

By the way, I've asked the supplier if the internal channels are aluminium.