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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