Re: [CAD_CAM_EDM_DRO] Re: Best way to mount Gecko modules ?

Very good info Les! Thanks
Oh man! That 220 must of been 4th of July on your TV. Yikes. But didnt
your breaker box have a Local grounding rod?
Oh well, off topic.
I looked into the Copley's and they want $445 for the ASP-090-36 that was
recommended to me. But the servo card along with all three of them is what
would kill me if I dove that direction. (if my wife didnt do it first)
So I'm pointing towards G340. I was also wondering if I would see the 60
amps you mentioned below, also?
Think you might have a drawing of that Op Amp setup?

Also, one more for you Les: What 500 line Encoder should I use to replace
the Tach?

Vince

----- Original Message -----
From: "Les Watts" <leswatts@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, January 21, 2003 5:59 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Best way to mount Gecko modules ?


> I recently developed a little circuit that monitors servo voltages,
> currents, and speed. It just uses op amps to solve the second
> order differential equations of motion to real time calculate
> spindle force.
>
> So I spent some time watching currents on the scope as the
> machine runs.
>
> I routinely see 60 amps peaks going around sharp corners and
> starting and stopping from rapids.
>
> The average total current with typical cutting is about 10-15 amps.
>
> This is with a xyz gantry machine using three Copley 412 amps
> which are similar in power to the Geckos. The amps are heat
> sinked (sunk?) and forced air cooled.
>
> Mariss had suggested to me that 240v operation would be
> preferrable and I agree. It is much stiffer than the average
> 120v 15a circuit and there are no worries about floating
> neutrals. Georgia power was nice enough to float my
> neutral last year and I really apreciated seeing 240 on
> my 120v outlets. Thank god the cnc was not on one.
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.alltel.net/~leswatts/wattsfurniturewp.html
> engineering page:
> http://www.alltel.net/~leswatts/shop.html
> Surplus cnc for sale:
> http://www.alltel.net/~leswatts/forsale.html
> > Les had mentioned in an earlier message about using 220v instead of 110v
> > for more stability in the higher current ranges. With all three of Les's
> > Motors moving at one time I can see the total current draw being pretty
> > high at times. So, would it be advisable to go that direction, or
survive
> > in the 110v range??? (pun intended)
> >
> > Thanks for any info on these!
> >
> > Vince
> >
> >
>
>
>
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