Re: Servo/Spindle motor ammeters?

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/partDetail.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)
>
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