RE: [CAD_CAM_EDM_DRO] Re: Prox switches

Prox switches come in three flavours (with respect to their outputs)

3 wire NPN
3 wire PNP
2 wire

Two wire sensors are meant to be wired between 18-24V and the +ve end of an
optocoupler LED.
They typically pass <1mA when not triggered and >7mA when they are. Whilst
simple to wire,
They can be tricky to parallel

3 wire PNP types have one wire to ground, one wire to 18-24V (I run min on
12V and they seem fine)
And the third gets pulled high when the prox triggers. To wire these to a
parallel port you need
a 5.1V zenner between the pin and GND and a resistor (a few K) between the
pin and the output of the
Prox. You only need one of these circuits for each input pin, you then wire
all the proxes in parallel

3 wire NPN are the most useful for hobby applications, 1 wire to 18-24, one
to GND, and the other to
The input pin with a pull up resistor. You can wire multiple NPN 3wire
proxes in parallel.


PK

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jarrett
> & Heidi Johnson
> Sent: Saturday, 4 March 2006 9:20 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Prox switches
>
> I'll most likely end up getting these, I noticed however that
> they are all NO, is there any out there that are NC?? I was
> always under the impression that NC was the switch of choice
> for limit switch's?
>
> Jarrett
>
>
> ----- Original Message -----
> From: "Robert Campbell" <bob@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Friday, March 03, 2006 11:28 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Prox switches
>
>
> > Jarrett,
> >
> > The sensing distance is from the face to the
> > object being sensed.
> >
> > I did some work with Multicam and talked with
> > their engineers about
> > proximity sensors. 2 mm is the best as it is not
> > as likely to sense chips or
> > other foreign objects. I use 12 mm barrel type
> > with a quick disconnect
> > cable. You do want a quick disconnect as it
> > makes is it easy to screw in the
> > sensor.
> >
> >
> > Bob Campbell
> > Bob Campbell Designs
> > www.Campbelldesigns.com
> > Mach 2/3 breakout boards
> > Relay boards
> > Spindle Speed boards
> > Stepper motors
> > Plasma Torch Height control
> >
> > ----- Original Message -----
> > From: "jerryflyguy" <hjjohnson@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Friday, March 03, 2006 11:17 AM
> > Subject: [CAD_CAM_EDM_DRO] Re: Prox switches
> >
> >
> >> Good to know Bob, I've seen the ones at
> >> Automation Direct, but
> >> figured if I could get these for $10 then it'd
> >> be a good move.
> >>
> >> When they talk about sensing range they are
> >> talking about the
> >> distance from the face of the unit to the
> >> sensing flag or are they
> >> talking about the range in which the sensor
> >> goes off as the flag
> >> pass in front of it. ie; a 30mm range on my x
> >> axis would stop the
> >> gantry some place in that 30mm but not any more
> >> accuratly than that,
> >> or does the sensor just have to be w/in the
> >> 30mm to see the flag??
> >>
> >> If a 2mm is better, would a 1mm barrel type be
> >> even better?? How
> >> accurate should a person expect one of these
> >> type sensor's to be?
> >> Can I consistantly stop my gantry w/in
> >> 0.010"???
> >>
> >> I was originally thinking some type of
> >> mechanical switch, but
> >> figured this type of switch might be better
> >> since there is no
> >> mechanical interaction and nothing should wear
> >> out.
> >>
> >> Thanks
> >> Jarrett
> >>
> >>
> >>> Jarrett,
> >>>
> >>> No, the sensing range is too big. You want a
> >>> sensing range of 2
> >> mm. I buy
> >>> mine form Automation Direct.
> >>>
> >>> Bob Campbell
> >>> Bob Campbell Designs
> >>> www.Campbelldesigns.com
> >>> Mach 2/3 breakout boards
> >>> Relay boards
> >>> Spindle Speed boards
> >>> Stepper motors
> >>> Plasma Torch Height control
> >>>
> >>> ----- Original Message -----
> >>> From: "jerryflyguy" <hjjohnson@...>
> >>> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >>> Sent: Friday, March 03, 2006 10:31 AM
> >>> Subject: [CAD_CAM_EDM_DRO] Prox switches
> >>>
> >>>
> >>> > Can anyone tell me if these will or will not
> >>> > work as a prox
> >> switch for
> >>> > my limit and home switches?
> >>> >
> >>> > http://cgi.ebay.com/Sick-Inductive-Proximity-
> >>> > Sensor_W0QQitemZ7595054869QQcategoryZ42899QQrdZ1QQcmdZViewItem
> >>> >
> >>> > You may have to cut and paste that link
> >>> > together to make it
> >> work. I
> >>> > know nothing about these types of switches
> >>> > so any help offered
> >> would
> >>> > be appreciated!!
> >>> >
> >>> > Thanks
> >>> > Jarrett
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> > Addresses:
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> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
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> http://groups.yahoo.com/group/jobshophomeshop I consider
> this to be a sister site to the CCED group, as many of the
> same members are there, for OT subjects, that are not allowed
> on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
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> List Mom
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>
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