Mazak QT Coolant pump

[Chips Everywhere]

I got a replacement pump for my Mazak QT 8, the pump can run on 1ph 115v or 1ph 220v. My machine has 3ph output at the pump connector at the electrical panel.

Should I be concerned with running the pump in 1ph 220v (5amp I think) configuration? My concern is that I’ll be pulling power from 2 of the 3 phases and possibly throwing something off balance, possibly affecting machine operation.

I’ve experienced this before on another machine, but when I had this issue it was a much larger amp draw (17amp I think) on 1 phase 115v and you would notice it on the spindle when the auxiliary compressor motor would kick on.

Any input is appreciated.

 

[noname777]

1hp, 220 AC is about 4.5 Ampere. Nothing should be thrown out of balance.

 

[Philabuster]

I got a replacement pump for my Mazak QT 8, the pump can run on 1ph 115v or 1ph 220v. My machine has 3ph output at the pump connector at the electrical panel.

Keep in mind, Mazaks run at 200 volts on the 3 phase side after the machine transformer. I bought a used 3 phase Grundfos pump off ebay for my Mazak and it works bitchin.

 

[cnctoolcat]

Keep in mind, Mazaks run at 200 volts on the 3 phase side after the machine transformer. I bought a used 3 phase Grundfos pump off ebay for my Mazak and it works bitchin.

Other brands of centrifugal pumps that work well, and can be found at bargains on Ebay (sometimes) are Walrus, and A-Ryung.

For CNC machining purposes, when searching for a pump, you want one with the highest "Head" rating, and a fairly low flow rating. I look for Head ratings of at least 50m-70m, with flows typically around 30 l/min.

Any higher flow ratings come at the expense of pressure (head), and they won't suit the purpose on a CNC machine. High flow, lower pressure pumps are for moving a lot of fluids from point A to point B, without need for high pressures.

You want pressure, to push the coolant past and through all the bends and tiny orifices', like in through-the-tool drills.

30 l/min is more than enough flow for machining purposes...use those Amps for Head.

Pumps with similar Amp draws (and thus horsepower) can function vastly different, based on how the pump itself is designed and intended for.

ToolCat