Re: [CAD_CAM_EDM_DRO] Re: RS 232 Output for DRO...closed-loop feedback?

EMC works with Kulaga\Mauch board.
Jon Elson sells board which also works with encoders.
Alex

----- Original Message -----
From: caudlet <info@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, April 26, 2003 12:11 AM
Subject: [CAD_CAM_EDM_DRO] Re: RS 232 Output for DRO...closed-loop feedback?


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "p0p0k0pf" <p0p0k0pf@a...>
> wrote:
> > I just ordered a CBX 3-axis DRO from Star Techno for my Shoptask
> > Lathe/Mill. They offer an RS232 output for positioning feedback,
> > and I bought it.
> >
> > I would like to know if anyone offers a CNC program that uses these
> > outputs for absolute positioning info provided by the dro scales
> for
> > CNC.
>
> I have the same unit on my fullsized Gorton mill. I did not buy the
> RS232 otpion but I made sure that the encoders inside the sender
> units were standard quadrature units. I got the RJ11 pinout from SS
> and plan on tapping in to the basic encoder signal and feed it to the
> encoder inputs on the servo controllers I bought from Rutex. I
> already have my motors (1/2HP DC PWM motors) on X & Y and a gearhead
> servo waiting for the Z. The project was started last year but I have
> to take the table apart to install the zero backlash ballscrews
> (essential for servo control) and the CNC plasma/router project has
> superceded it. I have to have my mill and DRO to build all of the
> special plates and brackets for my other CNC projects! There is a
> circuit in the files section on how to share an encoder between two
> sources. The RS232 thing sounds good but without compatible software
> to read it and use it the value is less than sterling. MACH 2 from
> www.artofcnc.ca is rumored to have encoder readouts but they are
> not "closed loop". I doubt they will be anytime soon. The dynamics
> of trying to use feedback off encoders or even the RS232 into a PC
> based program without using additional external circuitry presents
> some real loop tuning issues that will be difficult to overcome. The
> Rutex and Gecko Servo designs close the encoder loop at the hardware
> device. If you want more info just yell.
>
>
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