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# Electrical consumption machine tool : axis

## Electrical consumption machine tool : axis

(OP)
Hi,

I would like to determine the electrical consumption of machine tool axis during a cycle. I thought that from a cycle like this
we could determine the energy consumption with the formula Pmeca=Torque x speed and Pelec=Pmeca/productivity. And as I have the different time of the task during the cycle, I multiplicate the electrical power by the time to determine the power consumption in kWh. But I'm not at all sure of my method. What do think about that ? Thanks.

### RE: Electrical consumption machine tool : axis

#### Quote:

What do I think about that

Crazier than a pet coon.

Theoretically that would give an approximate relative result. In reality that fails to take into account so many things as to be not useless but utterly useless.

If you want this info you need to measure it empirically on the machine of interest, doing the work of interest, at the temperature of interest, with the (new) tool of interest, with the coolant flow of interest. Change anything and you will need to do it all over again.

Keith Cress
kcress - http://www.flaminsystems.com

### RE: Electrical consumption machine tool : axis

The main problem is your kW calculation.
What Keith says.
Use a Watt-Hour-Meter to find the actual consumption at each step.
From there resolve to Watt-seconds and sum and you're done.
I expect that the real world consumption may be from 150% to over 200% of your estimates.

Bill
--------------------
"Why not the best?"
Jimmy Carter

### RE: Electrical consumption machine tool : axis

(OP)
Ahaha Keith few problems with the English language ^^. But ok I understand the role of different parameters ...

Yes Bill I do it. I multiplicate the electrical power (kW) by time(s)/3600 to have a kWh consumption.

Thank you both !

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