Do you need to water cool erhm a water cooled spindle?!!

[JAZZCNC]

I've seen reference on the net to 'U' 'V' & 'W' for the spindle pins...are these just arbitary abbreviations give to the three phases?

Those are the correct abbreviations for each phase. The forth wire won't be connected to anything.
Just wire to 3 connectors and if runs in reverse swap any 2 wires. . . Thats it.!!

[HankMcSpank]

Those are the correct abbreviations for each phase. The forth wire won't be connected to anything.
Just wire to 3 connectors and if runs in reverse swap any 2 wires. . . Thats it.!!

but I don't know which pins on my spindle are actually U V & W.....so was hoping someone could say by referencing from the keying prong? (assuming they are all standard?)

[Jonathan]

but I don't know which pins on my spindle are actually U V & W.....so was hoping someone could say by referencing from the keying prong? (assuming they are all standard?)

It's arbitary. Just connect the 3 spindle power wires to U, V and W in any order and all that will happen if the order is 'wrong' is the spindle will spin the wrong way. If so, then as has been said, just swap any two of U, V & W.

[JAZZCNC]

Cheers Jon saved me some typing. .

[Jonathan]

It's occured to me that you might not be sure which are UVW and which is not connected (or earth)? If so then just use a multimeter, set it to measure resistance and check the resistances between all 4 pins - you should find that 3 of them (UVW) are virtually identical, and one is open circuit.

[HankMcSpank]

It's arbitary. Just connect the 3 spindle power wires to U, V and W in any order and all that will happen if the order is 'wrong' is the spindle will spin the wrong way. If so, then as has been said, just swap any two of U, V & W.

I'm obviously having a bad (blonde?!) day.... that's my point, I have no idea which of the four pins on the spindle's connector socket are the actual spindle's power wires (that was the main thrust of the photo earlier ...if those sockets standardized, I'd hoped someone might enlighten me which 3 of the 4 are used)

[Jonathan]

Option two is unscrew the connector and have a look. Whilst your at it you could solder on an earth cable.

[HankMcSpank]

Option two is unscrew the connector and have a look. Whilst your at it you could solder on an earth cable.

Sounds like option two it is! (I've used more energy asking on forum than getting a screwdriver out! lol)

Re soldering an earth cable onto the spare pin ...is this towards connecting an earth to the spindle's casing?)

[Jonathan]

Re soldering an earth cable onto the spare pin ...is this towards connecting an earth to the spindle's casing?)

Yes, so you'd want to unscrew the endcap, drill and tap a blind hole in it inside and use that to secure the cable.