7i76 and Z axis touch plate (short to ground)
21 Jun 2016 08:59 #76334
by pippin88
7i76 and Z axis touch plate (short to ground) was created by pippin88
Hi,
I've got a 7i43 and 7i76.
I want to implement a Z axis touch plate - for tool / workpiece touch off. I've previously done this successfully with a G540 (7xcnc.com/software/probing/z-touch-plate/). I just use a piece of copper PCB with a wire soldered to it. Then I have another wire with a clip on the end, clipped to the tool/spindle. The tool probes down and when it touches the PCB, closes the circuit / triggers the input.
The problem I'm having is the 7i76 has sinking inputs. I'm using 12V field power. My tool is grounded through the spindle back to the VFD. In the current state that means 12V gets shorted to ground.
Can I use a circuit from ground to an input pin and have it trigger?
How should I wire this up?
Thanks,
Nick
I've got a 7i43 and 7i76.
I want to implement a Z axis touch plate - for tool / workpiece touch off. I've previously done this successfully with a G540 (7xcnc.com/software/probing/z-touch-plate/). I just use a piece of copper PCB with a wire soldered to it. Then I have another wire with a clip on the end, clipped to the tool/spindle. The tool probes down and when it touches the PCB, closes the circuit / triggers the input.
The problem I'm having is the 7i76 has sinking inputs. I'm using 12V field power. My tool is grounded through the spindle back to the VFD. In the current state that means 12V gets shorted to ground.
Can I use a circuit from ground to an input pin and have it trigger?
How should I wire this up?
Thanks,
Nick
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21 Jun 2016 19:06 #76364
by PCW
Replied by PCW on topic 7i76 and Z axis touch plate (short to ground)
One way is to add a say 2K pullup resistor on the 7I76 sense input to 12V
so the 7I76 input will read high until shorted to ground
so the 7I76 input will read high until shorted to ground
The following user(s) said Thank You: tripwire
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22 Jun 2016 02:08 - 22 Jun 2016 02:09 #76383
by pippin88
Replied by pippin88 on topic 7i76 and Z axis touch plate (short to ground)
Last edit: 22 Jun 2016 02:09 by pippin88.
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22 Jun 2016 02:48 #76387
by PCW
Replied by PCW on topic 7i76 and Z axis touch plate (short to ground)
Yep
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22 Jun 2016 11:19 #76411
by pippin88
Replied by pippin88 on topic 7i76 and Z axis touch plate (short to ground)
Works great, thanks.
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15 Mar 2018 10:44 #107366
by draganius
Replied by draganius on topic 7i76 and Z axis touch plate (short to ground)
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15 Mar 2018 13:53 #107373
by andypugh
Replied by andypugh on topic 7i76 and Z axis touch plate (short to ground)
That should work.
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15 Mar 2018 14:31 #107374
by draganius
Replied by draganius on topic 7i76 and Z axis touch plate (short to ground)
Thank you Andy, very much.
![:) :)](/media/kunena/emoticons/smile.png)
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18 Mar 2018 02:06 #107480
by JohnnyCNC
Replied by JohnnyCNC on topic 7i76 and Z axis touch plate (short to ground)
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18 Mar 2018 20:18 #107509
by draganius
Replied by draganius on topic 7i76 and Z axis touch plate (short to ground)
Great work!
Maybe you can put magnet instead of alligator clip.
Maybe you can put magnet instead of alligator clip.
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