CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: USB ports ?

Posted by Paul
on 2004-12-02 08:39:56 UTC
Hi Dave

Not wanting to appear to be rude, but "crap". The discussion on the emc-users
group was all about routing the step and direction signals via USB to a
USB<=>parport converter.

If it was a case of sending vector & velocity data to a smart controller, then
I would concur that it is viable. As you point out, there are a number of
devices now on the market that work. Why, there are even motion sub-systems
to plug in to ethernet and CAN bus. BUT they all use vector/velocity or
coordinate data and spit out the step/dir signals (for stepper motors). In
effect, taking the high speed loop out of the PC and putting it into a smart
controller.

Regards, Paul.


On Thursday 02 December 2004 16:16, turbulatordude wrote:
> > We just went through this discussion on the emc-users group.  The
> > general consensus was that USB parallel ports will not work because
>
> data
>
> > might be queued, thus messing up timing to the servo/stepper motors.
> > Not all of us agreed, however.    
>
> Simply put, they are wrong and you were correct.
>
> The entire project can be sent to a smart controller and just run
> without the PC even being connected.
>
> Yes, e-stop and end switches then need to be in the controller.  
> That's why is would have to be a smart controller.
>
> Also, data transfer can be buffered with 5 minutes of table time
> being sent so the buffer has between 5 and 10 minutes of table
> time.   Even Windoz would have a hard time messing that up.

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Discussion Thread

salsaman59@s... 2004-12-01 21:44:45 UTC USB ports ? Kim Lux 2004-12-02 07:11:56 UTC Re: [CAD_CAM_EDM_DRO] USB ports ? turbulatordude 2004-12-02 08:17:48 UTC Re: USB ports ? Paul 2004-12-02 08:39:56 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Fred Smith 2004-12-02 08:42:56 UTC Re: USB ports ? Kim Lux 2004-12-02 10:13:35 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? turbulatordude 2004-12-02 10:32:38 UTC Re: USB ports ? R Rogers 2004-12-02 13:41:42 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Stephen Wille Padnos 2004-12-02 17:17:07 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? R Rogers 2004-12-02 18:08:09 UTC [CAD_CAM_EDM_DRO] Runaway servo questions A. G. Eckstein 2004-12-02 18:37:04 UTC Re: [CAD_CAM_EDM_DRO] Runaway servo questions Jon Elson 2004-12-02 21:39:04 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Jon Elson 2004-12-02 22:00:34 UTC Re: [CAD_CAM_EDM_DRO] Runaway servo questions Mariss Freimanis 2004-12-03 07:43:07 UTC Re: USB ports ? Kim Lux 2004-12-03 08:40:31 UTC Re: [CAD_CAM_EDM_DRO] Re: G2002, was Re: USB ports ? Mariss Freimanis 2004-12-03 08:50:56 UTC G2002, was Re: USB ports ? Kim Lux 2004-12-03 15:21:17 UTC Re: [CAD_CAM_EDM_DRO] G2002, was Re: USB ports ? Peter Homann 2004-12-03 18:16:24 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Mariss Freimanis 2004-12-03 18:26:04 UTC Re: USB ports ? Peter Homann 2004-12-03 18:28:41 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Mariss Freimanis 2004-12-03 19:32:32 UTC Re: USB ports ? salsaman59@s... 2004-12-03 22:49:51 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? turbulatordude 2004-12-03 22:58:47 UTC Re: USB ports ? turbulatordude 2004-12-03 23:03:29 UTC Re: USB ports ? Unstallable stepper ? Mariss Freimanis 2004-12-04 00:40:22 UTC Re: USB ports ? turbulatordude 2004-12-04 02:36:35 UTC Re: USB ports ? ballendo 2004-12-04 21:15:16 UTC Re: USB ports ? Unstallable stepper ? ballendo 2004-12-04 21:15:18 UTC G200X schematics? was Re: USB ports ? Mariss Freimanis 2004-12-05 08:19:15 UTC G200X schematics? was Re: USB ports ? John 2004-12-05 13:53:59 UTC Re: USB ports ? Mariss Freimanis 2004-12-05 14:07:36 UTC Re: USB ports ? ballendo 2004-12-05 14:47:56 UTC G200X schematics? was Re: USB ports ? ballendo 2004-12-05 14:49:02 UTC Re: USB ports ? Mariss Freimanis 2004-12-05 16:59:32 UTC G200X schematics? was Re: USB ports ? Peter Reilley 2004-12-06 08:55:13 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Raymond Heckert 2004-12-06 17:31:25 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Peter Homann 2004-12-06 17:54:07 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? Tony Jeffree 2004-12-06 23:45:09 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ? John Heritage 2004-12-07 08:52:50 UTC Re: [CAD_CAM_EDM_DRO] Re: USB ports ?