RE: [CAD_CAM_EDM_DRO] Connectors, switches etc.

Jay,

On the machine that I built for Wylie High School, I put proximity sensors
at both ends of the X and Y axis. They are wired in parallel. One end is the
home end. CNCPRO allows you to do this as it knows which direction it was
going in and which limit it hit.

Master 5 may do the same in the future.

The break-out board that I sell has connectors and power for both sensors.

Bob Campbell
www.campbelldesigns.com


-----Original Message-----
From: J.Critchfield [mailto:js3mc@...]
Sent: Thursday, May 09, 2002 11:06 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Connectors, switches etc.


Bob,

Are you using the proximity sensors for limit and home switches i.e. one
sensor for the home and limit for each axis?

Jay

----- Original Message -----
From: "Bob Campbell" <bob@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, May 08, 2002 10:25 AM
Subject: RE: [CAD_CAM_EDM_DRO] Connectors, switches etc.


> Jay,
>
> If you look at www.automationdirect.com they have drawings and information
> on their proximity sensors. A proximity sensor is basically an
electronics
> switch that switches whenever a metal object come in close contact with
the
> end of the sensor. The DC voltage for the sensor is in the range of 10 to
30
> volts DC. The switched output signal will then need to be converted back
to
> a 0 or 5 volt which is sent back to the PC. The break-out board that I
sell
> has an optical isolator built in to convert the signal back to 5 volts.
>
> A contactor is just a large relay that has contacts large enough to handle
> higher currents. The contactor is set up as a latching relay. By that I
mean
> that one of the contacts is used to maintain a current path for the coil
in
> the contactor once it is energized. The wiring through the on/off switch
and
> the EPO switch keeps power to the contactor. If the EPO switch is pushed
in
> or the on/off switch is turned off, the contactor will lose power and
switch
> the contacts to their open position. The contactor provides AC to my power
> supply and power to my Porter Cable router. The contactor that I use also
> has a normally closed contact that I wire to my Gecko drives disable line.
> When the contactor is energized, the disable line is open.
>
> The momentary switch is wired to energize the contactor. The sequence is
to
> turn on the on/off switch. This turns on my fans and applies 110 VAC to
one
> side of my momentary switch. By momentarily turning the momentary switch,
> 110 volts is applied to the contactor coil and energizes the contactor.
One
> contact is used to then apply 110 volts back to the coil keeping the coil
> energized (latching relay ). When you release the momentary switch, it
> reverts back to it's off position.
>
> Yes, the linear rails are attached to the extrusion with T-nuts. I have
them
> listed in my bill of materials.
>
> I hope that some of this helps. I will be adding another section to my
power
> supply PDF write-up in the next couple of weeks.
>
> Bob Campbell
>
> -----Original Message-----
> From: J.Critchfield [mailto:js3mc@...]
> Sent: Tuesday, May 07, 2002 9:25 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Connectors, switches etc.
>
>
> Bob,
>
> > For limit switches, I like Proximity switches.
>
> How do these work?
>
> > On my latest system, I used a contactor which is connected to my EPO
> switch
> > to drop all power if necessary including the power to my router. The
> > contactor also has a special normally closed contact that I use to
connect
> > to the disable contact on the Gecko drives.
>
> What is a contactor? How is it wired to the EPO? How is the router spindle
> wired to all this? Ak!
>
> I looked over your web site- very helpful. A comment about the power
supply
> page- The diagrams are too small to read and printing is no better (not so
> helpful)
>
> I looked over the bill of materials and I have one more question (yeah
> right) What is the momentary switch for?
>
> Oh ya! Looking at the pics of the machine. How did you attach the linear
> guides to the extrusion? Custom T-slot nut(s) or????
>
> Thanks,
>
> Jay
>
>
>
>
>
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sister site to the CCED group, as many of the same members are there, for OT
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Addresses:
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FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this as 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.



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