--- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@...> wrote:
>
>
> Shouldn't be a problem - the limit switches draw less than 100mA, and operate over a large voltage range.Michael
> To: DynoMotion@yahoogroups.com
> From: kristoffer.jensen@...
> Date: Wed, 14 Nov 2012 15:59:20 +0000
> Subject: [DynoMotion] Re: Proximity sensor...
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> I'm thinking about using 24V instead of the Kflop 5V for the reasons mentioned by Michael. My question is then; if I use a 24V 15A power supply for the motors, can use that power supply for for the proximity/limit switches as well or do I need an entirely separate power supply?
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> Thanks
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> --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
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> > I've seen similar things. They would be fine BUT:This is just the electronic guts. You'd have to wire the device to a cable, find a way to mount the device, make the connections coolant-proof, and strain relieve the cable.Not difficult, but could be time-consuming. For $5 you can purchase a completed assembly that just screws down. So it would come down to how much time you want to spend vs the money outlay.Michael Rosenfield
>
> > To: DynoMotion@yahoogroups.com
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> > From: oxforduniv@
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> > Date: Wed, 24 Oct 2012 16:49:53 +0000
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> > Subject: [DynoMotion] Re: Proximity sensor...
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> > A long Posting, but have you seen these?
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> > http://www.cnczone.com/forums/open_source_cnc_machine_designs/101878-electronic_home_switches_made_easy.html
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> > Al.
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> > --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
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> > > Chris,That sensor does not need external power; as you correctly noted, it is happy with 4.5 V. If you have any mechanical limit switches, though, they will usually be much more reliable on 24V. If they are unused, and have gold-plated contacts, they could be used on 5V. Since I have mechanical limit switches, I had the 24V power supply anyway, I used it to power my sensors, partially to be consistent, and partially to avoid loading the KFlop's 5V system where possible.Just be aware of how much current you are drawing from where - the KFlop has a limit how much 5V it can supply to external things (like encoders). I can't remember the limit now, but it is comfortably powering my 4 encoders + MDI.And the limits could be different with KStep; I'm using the KAnalog with external amps, so I haven't checked KStep power limitations.
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> > > Michael To: DynoMotion@yahoogroups.com
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> > > From: kristoffer.jensen@
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> > > Date: Tue, 23 Oct 2012 15:03:29 +0000
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> > > Subject: [DynoMotion] Re: Proximity sensor...
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> > > Hi Michael.
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> > > Thanks. Yes it definitely helped. I've been looking at eBay and other places, and there seems to be a good deal of hall effect sensors available, and some of them are tiny too.
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> > > I see most of them have 3 pins: supply, ground, and output. I have the Kflop-Kstep configuration, do I need to supply the sensor with a external power or can I somehow use the 5V from the Kstep http://dynomotion.com/Help/SchematicsKStep/ConnectorsKStep.htm JP33 / pin 26? For instance using this sensor: http://www.optekinc.com/datasheets/OHN3140U.pdf it says power supply in the 4.5-24V range.
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> > > --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
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> > > > I have found many good, inexpensive parts off Ebay. I ended up buying my prox sensors (and my MDI encoder/knob) from http://www.cnc4pc.com . Sometimes he has better deals on Ebay than on his website.I paid about $5 each for the prox sensors. In some cases, I have them sensing existing parts of my mill; in other cases, I made a little bracket out of sheet steel and mounted that to the mill. These are simple to wire to either KFlop or Kanalog - power (I used an external 24V power supply, also purchased of EBay), ground, and the signal goes to one of the opto-isolated inputs.Hope this helps, Chris!Michael Rosenfield
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> > > > To: DynoMotion@yahoogroups.com
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> > > > From: kristoffer.jensen@
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> > > > Date: Tue, 23 Oct 2012 11:51:03 +0000
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> > > > Subject: [DynoMotion] Re: Proximity sensor...
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> > > > Thank you for your response. There you go, I learned something new :) For some reason I thought these were electromagnetic...
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> > > > I guess the reason for considering these were the small footprint and low price. I will look for some Hall Effect sensors instead. Do you, or anyone else, have suggestions on either some specific sensors or where I could find some sensors?
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> > > > Thanks again for your help!
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> > > > --- In DynoMotion@yahoogroups.com, "himykabibble" <jagboy@> wrote:
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> > > > > No current has nothing to do with it. Those are nothing more than passive magnetic reed switches, just like what's used on windows for home alarm systems. Why would you want to use those? They certainly will not provide anything approaching accurate sensing. You'd be much better off with some decent Hall Effect proximity sensors.
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> > > > > Regards,
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> > > > > --- In DynoMotion@yahoogroups.com, "chrismd500" <kristoffer.jensen@> wrote:
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> > > > > > Newbie questions again: Would someone be able to verify that I can use one of these proximity sensors with Kflop/Kstep: http://www.hamlin.com/specsheets/59140_59141%20IssueAC.pdf or http://www.hamlin.com/specsheets/59025(updated)%20(2).pdf
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> > > > > > Since it's a magnetically proximity sensor I understand that there has to be a minimum (and maximum?) current applied to the sensor in order to make it "switch", and as far as I can see it seems to be compatible, but I just want to be sure before I buy the sensor.
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> > > > > > Thanks,
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--- In DynoMotion@yahoogroups.com, "chrismd500" <kristoffer.jensen@...> wrote:
>
> Thanks.
>
> --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
> >
> >
> > Shouldn't be a problem - the limit switches draw less than 100mA, and operate over a large voltage range.Michael
> > To: DynoMotion@yahoogroups.com
> > From: kristoffer.jensen@
> > Date: Wed, 14 Nov 2012 15:59:20 +0000
> > Subject: [DynoMotion] Re: Proximity sensor...
> >
> >
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> > I'm thinking about using 24V instead of the Kflop 5V for the reasons mentioned by Michael. My question is then; if I use a 24V 15A power supply for the motors, can use that power supply for for the proximity/limit switches as well or do I need an entirely separate power supply?
> >
> >
> >
> > Thanks
> >
> >
> >
> > --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
> >
> > >
> >
> > >
> >
> > > I've seen similar things. They would be fine BUT:This is just the electronic guts. You'd have to wire the device to a cable, find a way to mount the device, make the connections coolant-proof, and strain relieve the cable.Not difficult, but could be time-consuming. For $5 you can purchase a completed assembly that just screws down. So it would come down to how much time you want to spend vs the money outlay.Michael Rosenfield
> >
> > > To: DynoMotion@yahoogroups.com
> >
> > > From: oxforduniv@
> >
> > > Date: Wed, 24 Oct 2012 16:49:53 +0000
> >
> > > Subject: [DynoMotion] Re: Proximity sensor...
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> > > A long Posting, but have you seen these?
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> > > http://www.cnczone.com/forums/open_source_cnc_machine_designs/101878-electronic_home_switches_made_easy.html
> >
> > >
> >
> > > Al.
> >
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> >
> > > --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
> >
> > >
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> > > > Chris,That sensor does not need external power; as you correctly noted, it is happy with 4.5 V. If you have any mechanical limit switches, though, they will usually be much more reliable on 24V. If they are unused, and have gold-plated contacts, they could be used on 5V. Since I have mechanical limit switches, I had the 24V power supply anyway, I used it to power my sensors, partially to be consistent, and partially to avoid loading the KFlop's 5V system where possible.Just be aware of how much current you are drawing from where - the KFlop has a limit how much 5V it can supply to external things (like encoders). I can't remember the limit now, but it is comfortably powering my 4 encoders + MDI.And the limits could be different with KStep; I'm using the KAnalog with external amps, so I haven't checked KStep power limitations.
> >
> > >
> >
> > > > Michael To: DynoMotion@yahoogroups.com
> >
> > >
> >
> > > > From: kristoffer.jensen@
> >
> > >
> >
> > > > Date: Tue, 23 Oct 2012 15:03:29 +0000
> >
> > >
> >
> > > > Subject: [DynoMotion] Re: Proximity sensor...
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> > > > Hi Michael.
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> > > > Thanks. Yes it definitely helped. I've been looking at eBay and other places, and there seems to be a good deal of hall effect sensors available, and some of them are tiny too.
> >
> > >
> >
> > > >
> >
> > >
> >
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> > > > I see most of them have 3 pins: supply, ground, and output. I have the Kflop-Kstep configuration, do I need to supply the sensor with a external power or can I somehow use the 5V from the Kstep http://dynomotion.com/Help/SchematicsKStep/ConnectorsKStep.htm JP33 / pin 26? For instance using this sensor: http://www.optekinc.com/datasheets/OHN3140U.pdf it says power supply in the 4.5-24V range.
> >
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> > > > Thanks,
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> > > > Chris
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> >
> > > > --- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@> wrote:
> >
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> > > > > I have found many good, inexpensive parts off Ebay. I ended up buying my prox sensors (and my MDI encoder/knob) from http://www.cnc4pc.com . Sometimes he has better deals on Ebay than on his website.I paid about $5 each for the prox sensors. In some cases, I have them sensing existing parts of my mill; in other cases, I made a little bracket out of sheet steel and mounted that to the mill. These are simple to wire to either KFlop or Kanalog - power (I used an external 24V power supply, also purchased of EBay), ground, and the signal goes to one of the opto-isolated inputs.Hope this helps, Chris!Michael Rosenfield
> >
> > >
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> > > > > To: DynoMotion@yahoogroups.com
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> > > > > From: kristoffer.jensen@
> >
> > >
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> > > > > Date: Tue, 23 Oct 2012 11:51:03 +0000
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> > > > > Subject: [DynoMotion] Re: Proximity sensor...
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> > > > > Ray,
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> > > > > Thank you for your response. There you go, I learned something new :) For some reason I thought these were electromagnetic...
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> > > > > I guess the reason for considering these were the small footprint and low price. I will look for some Hall Effect sensors instead. Do you, or anyone else, have suggestions on either some specific sensors or where I could find some sensors?
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> > > > > Thanks again for your help!
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> > > > > Chris
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> > > > > --- In DynoMotion@yahoogroups.com, "himykabibble" <jagboy@> wrote:
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> > > > > > No current has nothing to do with it. Those are nothing more than passive magnetic reed switches, just like what's used on windows for home alarm systems. Why would you want to use those? They certainly will not provide anything approaching accurate sensing. You'd be much better off with some decent Hall Effect proximity sensors.
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> > > > > > Regards,
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> > > > > > Ray L.
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> > > > > > --- In DynoMotion@yahoogroups.com, "chrismd500" <kristoffer.jensen@> wrote:
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> > > > > > > Newbie questions again: Would someone be able to verify that I can use one of these proximity sensors with Kflop/Kstep: http://www.hamlin.com/specsheets/59140_59141%20IssueAC.pdf or http://www.hamlin.com/specsheets/59025(updated)%20(2).pdf
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> > > > > > > Since it's a magnetically proximity sensor I understand that there has to be a minimum (and maximum?) current applied to the sensor in order to make it "switch", and as far as I can see it seems to be compatible, but I just want to be sure before I buy the sensor.
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> > > > > > > Thanks,
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> > > > > > > Chris
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