RE: [CAD_CAM_EDM_DRO] Re: PC based CNC system architecture

Mariss,

I am not quite clear on what you are using the microcomputer for, but you
can likely do the same thing with a PIC. They are much less expensive
($2.00 - $8.00 depending upon the IO requirements). If you can tell me the
functions it needs to provide I can take a look to see if we can find one
that is suitable. I am sure there are a number of us on the list that could
handle the programming.

Tim
[Denver, CO]

> Hi,
>
> I've e-mailed preliminary circuit diagrams and a tentative form-
> factor 3D renderings to a few people. I will post to "Files" this
> weekend my work to date.
>
> The wise advice I've gotten is to have the port "polled" rather than
> interrupt. This requires a buffer on the pulse generator. I am
> looking at using a "Rabitt 2000" microcomputer. It is cheap, small
> and capable ($29, 1.9" by 2.2", 256K Flash, 128K SRAM, 40 I/O lines,
> 20MHz and Z80 superset instructions).
>
> The pulse generator layout is well along. It will have jumpers for
> full-step, half-step and 10 microstep drive types. There will be
> jumpers to set the full scale speed range of 4096, 8192, 16384 and
> 32768 equivalent full steps per second speeds.
>
> What that means is if the jumpers are set to 16384, then speeds will
> be in order:
>
> 0) 0 Hz for FS drives, 0 Hz for HS drives, 0 Hz for 10 uS drives
> 1) .25 Hz "", 0.50 Hz "", 2.5 Hz ""
> 2) .50 Hz "", 1.00 Hz "", 5.0 Hz ""
> 3) .75 Hz "", 1.50 Hz "", 7.5 Hz ""
> .
> .
> .
> .
> 32765) 32,767.25 Hz "", 65,534.50 Hz "", 327,672.50 Hz ""
> 32766) 32,767.50 Hz "", 65,535.00 Hz "", 327,675.00 Hz ""
> 32767) 32,767.75 Hz "", 65,535.50 Hz "", 327,677.50 Hz ""
>
> Note the even spacing.
>
> Mariss
>
>
>
> --- In CAD_CAM_EDM_DRO@egroups.com, "Wally K" <cnc4me@u...> wrote:
> > Mike, i think the problems with Jons soultion for EMC and stepper
> > control is as follows.
> >
> > Jon please correct me if i am wrong.
> >
> > 1) It is a closed proprietary system.
> > 2) Jon is building what he wants with no input from the group.
> > 3) it will be fairly expensive. From memory $350.00 or so.
> >
> > Wally K.
>
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for
> the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>
>