Re: [CAD_CAM_EDM_DRO] Re: DRO function when using gekos in manual mode

Mariss, Thank you very much for your step-by-step below. Excellent!
Yes, a Schematic would be great! Could AC switch noise possibly travel
back through the +5v Game Port line to the clean 5 volt used by the
Computer? Or is the GamePort I/O pins well protected?
Vince

----- Original Message -----
From: "Mariss Freimanis" <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, March 19, 2003 2:11 PM
Subject: [CAD_CAM_EDM_DRO] Re: DRO function when using gekos in manual mode


> You can use the encoder as a DRO if you don't mind wiring a little
> circuitry. The DRO will read the position while it is servo
> controlled, or if you reset the G320 (motor free-wheels), you can
> read position while hand cranking the machine. Here's how to do it:
>
> 1) Power the encoder from your PC +5VDC supply (available on GAME
> PORT pin 1). Take the encoder CHANNEL A and CHANNEL B outputs to
> where ever they have to go on your PC for the DRO function.
>
> 2) Get a dual-channel opto-isolator. Take the opto collectors to the
> G320 PHASE A and PHASE B inputs. Take both opto emitters to the G320
> ENC- input.
>
> 3) Put 180 ohm resistors in series with the opto LEDs. Take the LED
> cathodes to the encoder CHANNEL A and CHANNEL B outputs. Take both
> opto LED anodes to your PC +5VDC.
>
> 4) Place a 470 ohm resistor across the G320 ENC- and ENC+ terminals.
>
> Now both the PC and the G320 can use the encoder. This also gets
> around the 50mA maximum encoder supply current limit of the G320 so
> higher supply current encoders can be used.
>
> If there is interest, I will draw up and post a circuit diagram of
> this to the group.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "sparkness2003" <mark@c...>
> wrote:
> > I have a BP type mill Im cncing.Im installing ball screws and next
> > will be servo motors. from what ive read geckos are the way to go
> for
> > me.is there any software I can use when in manual control of the
> > machine to read the encoders and display DRO?
>
>
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