Re: [CAD_CAM_EDM_DRO] Newbie questions???????

On Jan 3, 2008 1:23 PM, Jack McKie <freshwatermodels@...> wrote:
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> Mike,
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> Thanks for the info on optoisolation! Sounds like that is a must have!
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> Also sounds like the e-stop wired in through the breakout board would be a
> good safety feature. My main concern is stopping the table motion w/o
> relying on software.
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> Thanks,
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> Jack
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> Michael Fagan <woodworker88@...> wrote:
> Optoisolation is for the protection of the computer, not the mill. It
> prevents voltage and current spikes from travelling back up the parallel
> port and frying the computer's circuits. It will also reduce the inevitable
> noise and crosstalk that will come from your motor wiring, and therefore
> prevent things like your estop from tripping randomly due to noise.
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> About the E-Stop, there are a couple of ways to go. Hooking it to an
> optoisolated parallel port pin and doing it in software is the "elegant"
> way, so it will trip Mach 3's own e-stop function. However, unless you are
> using Mach 3 for spindle control as well, you will be left with no table
> movement but the spindle will still be running. On my CNC Taig running
> EMC2, I connected my E-Stop button directly to the control side of a large
> (10 amps at 220 volts=20 amps at 110 volts) solid state relay. The power
> side of the SSR is connected to a duplex outlet, into which are plugged in
> my spindle motor and the 24V DC power supply for the Xylotex drive. I
> figure if the situation is serious enough to require an E-Stop, I don't care
> if I lose my coordinates, I just want to shut everything down. Eventually,
> the same SSR will be rewired for just the spindle motor and controlled by
> EMC2 through the parallel port, as will the E-Stop, and it will have the
> same effect. This is waiting for Rev2 (this summer most likely).
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> On Jan 3, 2008 7:46 AM, Jack Mc Kie <freshwatermodels@...> wrote:
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> > I have started to retrofit my X2 mini-mill using a Xylotex 3 axis
> > controller. I plan on using Mach III.
> >
> > #1 Does Mach III support 2 axis use allowing manual control of the Z
> > axis? I have used 2 axis prototrac retrofit on a bridgeport and want
> > to operate in similar mode.
> >
> > #2 I want to add an "emergency" (aw sh__) button to the machine. I am
> > also unclear as to the function of "opto-isolation". I am thinking of
> > adding a opto-isolated breakout board from homeshop cnc. Will this
> > break-out board allow for a very simple set up of an emergency
> > switch??? Does the opto-isolation merely reduce "noise" or does it
> > protect the computer also???
> >
> > Any assistance/insight on these would be much appreciated.
> >
> > Thanks,
> >
> > Jack
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> >
> >
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