Re: Wire Size for BPT Steppers

--- In CAD_CAM_EDM_DRO@y..., "cnc_4_me" <cnc4me@g...> wrote:

> --- In CAD_CAM_EDM_DRO@y..., "Marty Escarcega" <escarcega@c...>

wrote:

> > Seems like an uninteresting topic, but I would like to know

whether

> > or not the 18 gauge twisted pair unshielded control cable I have
> > located will work on my Bridgeport NEMA 42 Steppers. There was
> > enough of the old cable to see that it was 16 gauge and not

twisted

> > pair. Of course that was running the higher currents and voltages
> of
> > the original BOSS control. I will be using the G201's and a 70VDC
> > 8amp power supply.
> >
> > Thanks?
> > Marty
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Marty Escarcega" <escarcega@c...>

wrote:

> > Seems like an uninteresting topic, but I would like to know

whether

> > or not the 18 gauge twisted pair unshielded control cable I have
> > located will work on my Bridgeport NEMA 42 Steppers. There was
> > enough of the old cable to see that it was 16 gauge and not

twisted

> > pair. Of course that was running the higher currents and voltages
> of
> > the original BOSS control. I will be using the G201's and a 70VDC
> > 8amp power supply.
> >
> > Thanks?
> > Marty
>
>
> First i think from reading the forums that bridgeport also used 7

or

> 8 amps for thier steppers.
>
> Second, there are lies, dam lies, and specifications...If you do a
> search for wire current specs on the net you can get any answer you
> want.....But from experance i can give you the following

advice...For

> the type of wiring you are doing, multiple conductors in a jacket

and

> panel wiring with many wires in a bundle, i would take the
> conservitive aproach and use these ratings. 10Ga-20amp, 12Ga-12amp,
> 14Ga-8amp, 16Ga-5amp, 18Ga-3amp....
>
> For comparison, house wiring would have a different rating because

of

> the amount of air space around the conductors and the allowable
> voltage drop. Typical 120vac house wiring For shorter runs of wire
> would be 10Ga-30amp, 12Ga-20amp, 14Ga-15amp.
>
> Personally i would say 18Ga is to small, 16Ga is ok, and 14Ga would
> be conservitive.
>
> As for twisted pair, i would not know how to use it...Twisted pair
> usuaally implies one of the twisted wires is connected to ground,
> possibly that would help noise emmisions. Otherwise 2 power leads
> from stepper could be twisted but i do not know what the outcome of
> this would be....
>
>
> WallyK
>
> P.S. The hardware store usally carries 4 conductor ruberjacketed
> cable....This cable may be of a finer strand then the 18Ga you want
> to use and is probally more flexable....A better choice then

typical

> stiff pvc cable....Also the rubber cable can be had in a oil
> resistant rating...