7i76 and Z axis touch plate (short to ground)
19 Mar 2018 14:07 #107545
by andypugh
Replied by andypugh on topic 7i76 and Z axis touch plate (short to ground)
Nickel-plated magnets are conductive, I am not sure if the uncoated ones are.
I used a couple of ring magnets to make my own "Magsafe" connector for my touch probe as I was paranoid about starting the spindle with the probe mounted.
Carbide tools are conductive, but I don't know how magnetic they are (It might depend on how much Cobalt they have in them)
I used a couple of ring magnets to make my own "Magsafe" connector for my touch probe as I was paranoid about starting the spindle with the probe mounted.
Carbide tools are conductive, but I don't know how magnetic they are (It might depend on how much Cobalt they have in them)
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19 Mar 2018 21:19 #107567
by draganius
Replied by draganius on topic 7i76 and Z axis touch plate (short to ground)
Why start spindle when probe mounted?
I saw solution somewhere (magnet instead alligator clip when spindle off).
I will post here when make probe with magnet.
I saw solution somewhere (magnet instead alligator clip when spindle off).
I will post here when make probe with magnet.
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19 Mar 2018 22:38 #107574
by JohnnyCNC
Replied by JohnnyCNC on topic 7i76 and Z axis touch plate (short to ground)
I thought about using a magnet but didn't like the idea of magnetizing my drill bits. I also thought about a wiper that would stick up and I could push it against the bit while it moves down and makes contact. My only fear would be that the sliding contact might cause and inaccurate detection if the connection is broken just at the split second the tool touches down. I do want to put a button on the touch plate to start the probing process.
John
John
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20 Mar 2018 00:36 #107576
by DanMN
Replied by DanMN on topic 7i76 and Z axis touch plate (short to ground)
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21 Mar 2018 02:22 #107650
by JohnnyCNC
Replied by JohnnyCNC on topic 7i76 and Z axis touch plate (short to ground)
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21 Mar 2018 10:38 #107653
by pippin88
Replied by pippin88 on topic 7i76 and Z axis touch plate (short to ground)
Nice work JohnnyCNC.
My plan is to have a few buttons at the top of the Z axis:
Jog down (medium)
Probe down
Z up to top (fast)
My plan is to have a few buttons at the top of the Z axis:
Jog down (medium)
Probe down
Z up to top (fast)
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25 Jun 2018 07:49 #112835
by blazini36
It's worth mentioning that since the pin is driven high waiting to go low you have to use the "input-xx-not" pin in hal. Not a big deal but if you make a probe that is unplugable you have to keep the resistor close to the card to that it is not unplugged with the probe. Just dawned on me that maybe somebody would want to put the resistor in the body of the probe itself.
Replied by blazini36 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
It's worth mentioning that since the pin is driven high waiting to go low you have to use the "input-xx-not" pin in hal. Not a big deal but if you make a probe that is unplugable you have to keep the resistor close to the card to that it is not unplugged with the probe. Just dawned on me that maybe somebody would want to put the resistor in the body of the probe itself.
The following user(s) said Thank You: tommylight
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29 Jun 2018 21:48 #113110
by pippin88
Good point.
Replied by pippin88 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
It's worth mentioning that since the pin is driven high waiting to go low you have to use the "input-xx-not" pin in hal. Not a big deal but if you make a probe that is unplugable you have to keep the resistor close to the card to that it is not unplugged with the probe. Just dawned on me that maybe somebody would want to put the resistor in the body of the probe itself.
Good point.
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