RE: [CAD_CAM_EDM_DRO] Re: parallel port finally obsolete?

Actually, THC was just added to the SmoothStepper. The latest addtions were
released for the Ethernet SS first and are now being tested on the USB
version. The larger point however is that an external motion control device
must handle the 'real time' functions itself; whatever the particular 'real
time' function might be.



Jeff Birt

Soigeneris.com



From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Tom
Sent: Wednesday, February 22, 2012 6:09 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: parallel port finally obsolete?







--- In CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> , "Jeffrey T. Birt" <birt_j@...>
wrote:

>
> >For using a feedback related application
>
> >(best example is the THC logic in MACH for plasma cutting) it does not
> work.
>
>
>
> Not exactly true. The motion control board needs to handle the 'real time'
> things itself and in fact can do a MUCH better job than Mach (parallel

port)

> ever could (due to the limitations of the parallel port model). The
> SmoothStepper, et.al, handle things like limit switches, spindle sync,

etc,

> etc internally.
>
>
>
> Jeff Birt
>
> Soigeneris.com
>

You are wrong. You cannot use THC logic in MACH with USB (Smooth Stepper,
etc) because it (THC) forms a real time servo loop in MACH with the parallel
port. You can't even use the THC function in MACH unless you have the
parallel port driver loaded and active. You can't run another driver for
pulsing with the parallel port driver.

TOM Caudle
www.Candcnc.com





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