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Author Topic: Z-axis Auto zero wiring  (Read 27105 times)

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Offline Tweakie.CNC

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Re: Z-axis Auto zero wiring
« Reply #10 on: April 06, 2011, 12:57:32 PM »
Just tried the script on my machine and it works OK here.
The Z only moves up 1" after it has touched the plate. Silly question but have you got your Z axis reversed ? ( +Z should be upwards movement)

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline cvk31

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Re: Z-axis Auto zero wiring
« Reply #11 on: April 06, 2011, 01:07:51 PM »
No,  the Z is correct.  I am wondering if I need to bring the pin up to 5v with the resistor trick.  I can get it to so the Z moves down when I run the script but I have to set the pin to emulated.  When I do that I get no response from contacting the plate to the alligator clip.  If I turn off emulate the digitizer light in diagnostics is lit and contacting the plate and clip cause it to go off.

Offline Tweakie.CNC

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Re: Z-axis Auto zero wiring
« Reply #12 on: April 06, 2011, 01:22:12 PM »
The probe input should be configured active low and the digitize LED should be off until the tool contacts the plate.
Could it be that your BoB is holding the input low and causing the digitize led to be on ?

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline cvk31

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Re: Z-axis Auto zero wiring
« Reply #13 on: April 06, 2011, 01:31:08 PM »
I think that is the issue.  I was looking into bringing it high with a resistor.  Can I check the screw terminals on my BOB for an available 5v to attach the resistor to with my multimeter? I am a little worried about checking them willy nilly.
Will I have to enable the pin I select in outputs to find 5v ?
I hate having to ask these stupid newbie questions, thanks for your patience.

Offline Tweakie.CNC

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Re: Z-axis Auto zero wiring
« Reply #14 on: April 06, 2011, 01:42:59 PM »
They are not stupid questions - don't forget I was in exactly the same position as you, a year ago perhaps (I couldn't get it to work first time either  :'( )


I assume you are using an active BoB which is powered 5 Volts so take the +5V from there.
I would try a resistor about 10,000 ohms (10K) to see if that pulls the input up to 5Volts - if that doesn't do it then we will have to think again.

Do you have any details on your BoB make, model etc. ?

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline cvk31

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Re: Z-axis Auto zero wiring
« Reply #15 on: April 06, 2011, 01:51:20 PM »

Offline ger21

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Re: Z-axis Auto zero wiring
« Reply #16 on: April 06, 2011, 02:54:40 PM »
I use a 10K pullup with my auto zero and Xylotex.
Gerry

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Offline cvk31

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Re: Z-axis Auto zero wiring
« Reply #17 on: April 06, 2011, 03:08:15 PM »
Which pin did you connect the 10k to?

Offline ger21

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Re: Z-axis Auto zero wiring
« Reply #18 on: April 06, 2011, 03:15:23 PM »
I'll be home in about 90 minutes and I'll let you know.
Gerry

2010 Screenset
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JointCAM Dovetail and Box Joint software
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Offline ger21

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Re: Z-axis Auto zero wiring
« Reply #19 on: April 06, 2011, 05:11:05 PM »
Pin 15
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
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