On Sat, 4 Jul 2020 at 11:53, andrew beck <andrewbeck0...@gmail.com> wrote:

> I have the high
> pressure pump already and there is a hole down the middle of my spindle.  I
> just need a rotary union I think and need to do some machining to make it
> all fit..

Do you have a power drawbar? I could see that rather complicating matters.
Sometimes the coolant goes in to the tool via ports in the toolholder flange;
https://www.carbideanddiamondtooling.com/CAT50-ADB-C-Shell-Mill-Holder-0.750-Inch-Pilot-Arbor-Diamete-r3.50-Inch-Gage-Length-ID-12389-

You can get through-coolant tool adaptors:
https://www.coveng.co.uk/driven-tooling-for-machining-centres/rotary-coolant-adapters-inducers/


-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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