Re: ELS | Poor Man''s CNC ? | G-REX

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
<mariss92705@y...> wrote:

>
> I didn't realize this is such a big thing. Reason I say that is I
> added "ratio" to to the G-Rex instruction set but thinking it would
> be a semi-useless instruction.
>
> Ratio (RTO) causes an axis to select a target and follow it at a
> fixed ratio. It works like this:
>
> Say you have a 500-line encoder on your spindle and you have a 10-
> microstep drive. The spindle will genererate 2,000 counts per
> revolution and the drive will move at 2,000 steps per rev. Both are
> equal.
>
> Let's also say you want the step motor to move at 1/10 the spindle
> speed. The step motor is in the x-axis group as is the encoder. You
> would send the following insruction to the G-Rex:
>
> RTOxENCx+1000000000<cr>
>
> Meaning "have the x-axis motor track the target ENCoder x at a ratio
> of 0.1000000000 of the target's speed." The step motor would follow
> the spindle speed (position) in the same direction to a 10-place
> accuracy. That should be good enough for most folks.
>
> That's all there is to it. Connect a laptop to the G-Rex via USB,
> download that line of code from NotePad, disconnect and walk away.
>
> Mariss
>
>

Dang,

there are a host of microcontrollers out that that can USB and it
would be very simple to just load either tables or formulas and
connect a keypad and LCD to complete the circle.

Now, about the G-Rex...

when you up-date your web-site, you gotta let us know !

Looks Great !

http://www.geckodrive.com/index.cfm

Dave