Re: Servo/Spindle motor ammeters?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dennis Schmitz"
<denschmitz@...> wrote:

>
> Sorry, use this link: That one won't be good for long it it still

is.

>
>

http://newark.com/NewarkWebCommerce/newark/en_US/endecaSearch/partDet
ail.jsp?SKU=01K5532

>
> On 7/12/06, Dennis Schmitz <denschmitz@...> wrote:
> > Don't do that, open up the drive and find the current sense

resistor

> > and hook one of these across it:
> >

http://newark.com/NewarkWebCommerce/newark/en_US/endecaSearch/partDet
ail.jsp;jsessionid=ZSKL32AMIEABSCXDUY2SFGIK2OTCIIV1?SKU=01K5532&N=0

> >
> > In geckos, they're connected to the low-side driver and are

0.025 ohm,

> > making the display fullscale at 8 amps.
> >
> > Or if you're really anal about not calculating that 2.5 is

really 1,

> > you could divide the sense resistor voltage by 2.5 and get a 1:1
> > correspondence to the digits, and a 20 amp full scale.
> >
> > On 7/12/06, Abby Katt <cncgroupnospam@...> wrote:
> > > Hi Guys,
> > >
> > > Just searched my archives of the list and found no direct

references to

> > > this, so thought I would post here as it seems a pretty

obvious question

> > > (though I suspect my range of answers will surprise me, as

usual, about

> > > how obvious items are rarely so - especially in CNC!)
> > >
> > > I was at the Mach 2006 expo and saw a lot of the "real-thing"

CNC mills,

> > > personally I thought Mach3 looked way better than many of them

(don't

> > > flame me! :), but I did notice a feature standard to just

about every

> > > mill and not on the average hobbiest CNC. They had load bar-

graphs for

> > > the spindle motor, and the servo motors.
> > >
> > > I want load-meters for my mill! :)
> > >
> > > So I was wondering, can I just get away with 3 DC ammeters

placed

> > > between the power of each servo driver, and one AC ammeter in

series

> > > with my (AC) spindle? How reliable is this, or does it really

not

> > > indicate anything other than looking cool (in which case I'll

probably

> > > do it anyway...)
> > >
> > > Abby
> > > (http://www.silverkatt.co.uk)
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
>

I want that too..., but I was thinking about a bargraph indicator,
could that be made with a lm3914 it's a bargraph driver ?

Fogassa