CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] USB DRO

Posted by james owens
on 2000-04-06 12:04:30 UTC
Can't disagree with you. It would take a system far faster than the computers we are running today, not forgetting the coding for the program.

Regards,

Terry.


----- Original Message -----
From: Jon Elson
To: CAD_CAM_EDM_DRO@egroups.com
Sent: Thursday, April 06, 2000 6:55 PM
Subject: Re: [CAD_CAM_EDM_DRO] USB DRO




james owens wrote:

> I have been speaking to a programmer this afternoon and he is
> convinced USB is the way to go in all things computer. There is
> nothing that cannot be done with USB that can be done with other
> ports.
>
> 127 devices can be daisy-chained through one hub with a further 127
> hubs being daisy-chained. The possiblilty of having a whole workshop
> running from one computer which each axis controlled by the host
> computer via a USB hub. Which equates to 16129 axis control
> simultaneously from one computer. One hell of a CNC control
> program!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Well, that's a programmer for you. Not a computer scientist, or
engineer! DRO, sure, if you
use an encoder counter chip, then you don't have to worry about latency,
and the human
eye is so slow, the update rate is no problem. But, for CNC control,
you need absolute
certainty that messages will be processed within a certain time, and the
update rate is
hundreds of times higher. I think 8 axes plus digital control is
reasonable with respect
to bandwidth of the USB, but I have no idea about latency.

Jon


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Discussion Thread

james owens 2000-04-05 10:12:16 UTC Re: [CAD_CAM_EDM_DRO] USB DRO James Cullins 2000-04-05 16:35:28 UTC Re: [CAD_CAM_EDM_DRO] USB DRO Tim Goldstein 2000-04-05 20:48:24 UTC RE: [CAD_CAM_EDM_DRO] USB DRO Eric Keller 2000-04-06 11:20:12 UTC Re: [CAD_CAM_EDM_DRO] USB DRO james owens 2000-04-06 12:04:30 UTC Re: [CAD_CAM_EDM_DRO] USB DRO Bruce Hassell 2000-04-06 12:37:14 UTC Re: [CAD_CAM_EDM_DRO] USB DRO