American Welding Society Forum
Looking at a cnc lathe and noticed input power was 208 three phase with 175 amp draw. Does that sound right? If so I'm going to have to find some more power with the welding machines and other equipment in the other part of the shop.
there a data plare on the motor?
That doesn't sound right to me unless it is a serious monster of a lathe If it took that much power I would be very surprised that it would have been designed to operate on 208 volts instead of 480.
I think 17.5 amps would be more likely.
That is what I was thinking.
It's a leadwell LTC35 46horse spindle motor with a 22 horse z-drive.
Not your typical home shop lathe. That may be peak amperage draw at start up.
No its going in our machine shop. Welding/ fabshop are on the same service but in a different building. Had my electricial look at it and turns out we have plenty of power. Leadwell requires it run on 208 because the fanuc controls require that input. We got her se in the shop last week and she's a big girl @ 28000 pounds it took a big forklift to set her but we got it done.
With today's copper prices, wouldn't it be more affordable to wire the motors for 480, and use a transformer for the controls?
It depends how the building is wired. If there is Bus Duct everywhere, it might not be but a few feet of wire to get to the machine.
If it is a long wire run, there is merrit to the idea, provided it is fairly easy to segregate the control circuitry from the machine tool circuitry.
Transformers are not cheap either, and it has become much harder to find used ones as many were scrapped a few years ago when copper & aluminum prices were way up.
Now that is a lathe! That has more horsepower than my shop's air compressor at a lowly 40.
You want to see monster lathes??? Go to either Newport News or Electric Boat or Bath Iron or any of the big shipyards down south, and have a look at the monsters they use to machine the shafts on both the subs as well as the giant ones found on aircraft carriers... Now those are huge and have plenty of horses to boot.
Now that You mention the HP of the machine, the amperage doesn't seem out of line.
My calculations say it should draw around 70 amps.
I stand corrected it should be 130 amps.......
Yeah and add in the feed motors and other circuitry, I would guess 175 amps is about right. I am not an electrician but I would expect the manufacturer has some idea as to what is required.
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