Re: [CAD_CAM_EDM_DRO] Re: The mechanical part of my router is done!

On Wed, 16 Jul 2003 05:57:05 -0000, you wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "marvinstovall"
><lstovall@c...> wrote:
>> Alan, could you please elaborate on why we want the logic power
>> isolated from the motor power?
>> Thanks,
>> Marvin
>
>Let me try: logic cable (+5V, 0V) may pick up spurious signal from
>the power cable giving rise to spurious movements?
>
>Experts, correct me if that is wrong. Homework done.

That's certainly a factor.

There's another one as well. In the days of the early computers, the
parallel port was a removable card. Now, it is built into the
motherboard, with no hope of replacement other than a new motherboard,
or adding a card and disabling the on board port.

Some have reported motherboard failures due to wiring errors or just
plain spikes in the CNC hardware (motor controllers, etc.).

That's why I built a parallel port isolation board for my system. I'm
using an old laptop to run it, and there's no hope of getting a
parallel port in that, should the current one go out.

Harvey

>
>
>> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Alan Marconett KM6VV
>> <KM6VV@a...> wrote:
>> > Hi Chuck,
>> >
>> > An interesting and very well made project! And as I have plenty
>of
>> > stepper motors (I even have the same motors you used!), I'd be
>> > interested in seeing plans for building it. Do you have plans
>ready
>> > that you could post or email?
>> >
>> > For electrical hints, I'd suggest you keep the stepper wires away
>> from
>> > the digital wires, and be sure to have enough length to
>conveniently
>> > reach your driver/PS. I have built a few driver/PS boxes, and
>just
>> > finished and posted one in the SherlineCNC files (Schematic to be
>> posted
>> > in a day or two).
>> >
>> > Also an older one under photos "driver-P" of CCED.
>> >
>> >
>>
>http://photos.groups.yahoo.com/group/cad_cam_edm_dro/lst?.dir=/Driver-
>> PS+%26+Pendant&.src=gr&.order=&.view=t&.done=http%
>> 3a//briefcase.yahoo.com/
>> >
>> > Ouch! Just look in photos for Driver-P
>> > http://photos.groups.yahoo.com/group/CAD_CAM_EDM_DRO/lst
>> >
>> > My driver/PS boxes use Geckos, and one uses an early version of
>the
>> > Gecko (CN0143). Microstepping works better on the newer steppers
>> that
>> > are designed for it.
>> >
>> > Be sure to put in line switch and fuse, grounded power cord,
>power
>> entry
>> > module (for the filtering), enable switches for each axis (where
>> > possible), connectors for the stepper motors (makes trouble
>shooting
>> > easier), DB25 connector for the parallel port, and a "power on"
>> > indicator. Also desirable are SSS (solid state switches) for
>> Spindle
>> > (and AUX), individual fuses for each Gecko (be sure to put a 470
>uF
>> cap
>> > at each module), Connectors for the limit switches, M6 "tool
>> change",
>> > and a digitizer.
>> >
>> > G201's need +5 from the PC, a wall-wart. Don't be tempted to
>hang
>> a 5V
>> > regulator chip on the motor's +48V supply! We WANT the isolation.
>> >
>> > HTH
>> >
>> > Alan KM6VV
>> > SherlineCNC
>> >
>> > Charles Knight wrote:
>> > >
>> > > >
>> > > >
>> > > >Looks very nice considering the minimum of dollars invested.
>> What was your
>> > > >total investment so far?
>> > > >
>> > >
>> > > I haven't added it up, completely, yet. But after purchasing
>> > > miscellaneous screws, nuts, bolts, drill bits, etc...I think
>I'm
>> down
>> > > somewhere around $20 total. Not too bad for such a complex
>> project.
>> > >
>> > > -- Chuck Knight
>
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