Z homing touch plate - hardware/software input
- randypetersen
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09 Sep 2019 21:15 #144631
by randypetersen
Z homing touch plate - hardware/software input was created by randypetersen
Here is some pics of the Z touch plate that came with my CNC. However, I cannot figure out for the life of me how it would work.
As you can see there are 2 wires going to the plate, both are connected to plate so there is no resistance between those 2 wires. They run to the controller and have been identified.
My understanding is that I would need a wire going to the tool and one to the plate. However I can't find any conductor going from the tool/spindle to the controller. I think the spindle is insulated? Would I have to run another wire to the spindle that would be clamped on tool? or is there any other way around this?
I created one of these pretty simply with my old parallel port / mach3 setup. I did have to clamp on to the tool though. Wasn't sure if that would always be required of if there was a better way?
Then what's the best practice for setting up a Z homing procedure within LinuxCNC?
Thanks for any info!
As you can see there are 2 wires going to the plate, both are connected to plate so there is no resistance between those 2 wires. They run to the controller and have been identified.
My understanding is that I would need a wire going to the tool and one to the plate. However I can't find any conductor going from the tool/spindle to the controller. I think the spindle is insulated? Would I have to run another wire to the spindle that would be clamped on tool? or is there any other way around this?
I created one of these pretty simply with my old parallel port / mach3 setup. I did have to clamp on to the tool though. Wasn't sure if that would always be required of if there was a better way?
Then what's the best practice for setting up a Z homing procedure within LinuxCNC?
Thanks for any info!
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10 Sep 2019 06:06 #144661
by pl7i92
Replied by pl7i92 on topic Z homing touch plate - hardware/software input
seams like a omic sence
get 5V on the plate and mesure the resistence if a steel tool touch the plate
get 5V on the plate and mesure the resistence if a steel tool touch the plate
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- tommylight
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10 Sep 2019 06:55 #144672
by tommylight
Replied by tommylight on topic Z homing touch plate - hardware/software input
If using parallel port, just ground the spindle/machine and wire the sensor to on of the inputs on the parallel port.
No wires needed. Parallel port can sense input pins going to ground so that is easy.
If you have a BOB, you might need to add a pull up resistor for it to work.
No wires needed. Parallel port can sense input pins going to ground so that is easy.
If you have a BOB, you might need to add a pull up resistor for it to work.
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10 Sep 2019 07:01 #144674
by pl7i92
Replied by pl7i92 on topic Z homing touch plate - hardware/software input
@ tommy
dont you think it workes like renishow high sense reed relai
the large detector plate lets me think of this
dont you think it workes like renishow high sense reed relai
the large detector plate lets me think of this
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10 Sep 2019 07:06 #144676
by tommylight
Replied by tommylight on topic Z homing touch plate - hardware/software input
It's a metal plate so the reed relay will not work inside it. Reed relays react to magnets or magnetic field.
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10 Sep 2019 07:17 #144678
by pl7i92
Replied by pl7i92 on topic Z homing touch plate - hardware/software input
not direct reed relais some kind of that sence
BUT im with you it may only ((black pice)) be a pice of Electric shield to the Mashine
he needs to get a meter on to see what hapens without a mashine connect
meter BLACK to one pin of detector connector
the other to a BIT/tool in Hand and just touch
while meter is in Detect Thrue mode / ""Durchgangsprüfung""
then he is fine and can simply direct BOB connect via ground detect
I DO NOT RECOMED BOB ground on Mashine AS so many using that
BUT im with you it may only ((black pice)) be a pice of Electric shield to the Mashine
he needs to get a meter on to see what hapens without a mashine connect
meter BLACK to one pin of detector connector
the other to a BIT/tool in Hand and just touch
while meter is in Detect Thrue mode / ""Durchgangsprüfung""
then he is fine and can simply direct BOB connect via ground detect
I DO NOT RECOMED BOB ground on Mashine AS so many using that
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- randypetersen
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09 Oct 2019 16:23 #147575
by randypetersen
Replied by randypetersen on topic Z homing touch plate - hardware/software input
I still haven't had any luck on this, maybe I need to purchase or build a different Z plate.
Between the bit and the ground there is some resistance but it's a connection. I missed it at first because I was just listening for a continuity beep from my meter, however there is a connection between bit and ground wires.
How could I wired that up?
I am using a Mesa 7i77 & 7i92 boards.
Anyone have any thoughts?
Thanks!
Randy
Between the bit and the ground there is some resistance but it's a connection. I missed it at first because I was just listening for a continuity beep from my meter, however there is a connection between bit and ground wires.
How could I wired that up?
I am using a Mesa 7i77 & 7i92 boards.
Anyone have any thoughts?
Thanks!
Randy
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- randypetersen
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11 Oct 2019 13:55 #147702
by randypetersen
Replied by randypetersen on topic Z homing touch plate - hardware/software input
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18 Oct 2019 13:08 #148196
by andypugh
Replied by andypugh on topic Z homing touch plate - hardware/software input
You might be able to add an opto-isolator (or even a relay) to the touch-plate circuit to convert the resistance change to an on/off signal for the GPIO.
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