Z axis

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22 May 2020 00:05 #168555 by motal2004
Replied by motal2004 on topic Z axis
That's the plan, I will try at some point this weekend....I was reading some forums and will be trying their suggestions. I should have waited and saved up for a Hypertherm...

thanks for everyone help up to this point.
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23 May 2020 22:58 #168738 by motal2004
Replied by motal2004 on topic Z axis
Throwing in the towel with this Mesa thcad-10 , And plasmac, Very disappointing!!

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23 May 2020 23:27 #168744 by phillc54
Replied by phillc54 on topic Z axis
Sorry we couldn't help you.

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24 May 2020 02:48 #168758 by rodw
Replied by rodw on topic Z axis

motal2004 wrote: Throwing in the towel with this Mesa thcad-10 , And plasmac, Very disappointing!!


Yes we are sorry to see you go too. It looks like you have got through the Plasmac setup but have hit the wall with getting your plasma machine to work. Don't expect that to be any easier on another controller or THC.

As you don't have an ArcOK signal on your machine, Plasmac attempts to fake one for you. It does that by turning on an ArcOK signal when the arc voltage excennds the low volt threshold. That threshold needs to be high enough to confirm a good arc has been triggered. Around 60 volts is a good starting point.

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24 May 2020 04:20 #168763 by motal2004
Replied by motal2004 on topic Z axis
My plasma machine does have an arcok singal output...
I will re wire my Cnc pigtail to raw voltage and connect the arcOK signal in to the Mesa 7i96 board, and try again.
So putting the following line in my hal file
setp hm2_7i96.0.encoder.00.scale -1
setp hm2_7i96.0.encoder.00.filter 1
setp hm2_7i96.0.encoder.00.counter-mode 1
What’s the counter-mode for?

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24 May 2020 04:23 #168764 by phillc54
Replied by phillc54 on topic Z axis
It sets the encoder into unidirectional mode so it only counts the rising edge of phase A and phase B is ignored

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24 May 2020 04:24 - 24 May 2020 04:26 #168765 by PCW
Replied by PCW on topic Z axis
Setting the encoder counter into up/down mode instead of the default quadrature mode
so it can count frequency on its "A' input

(B is not ignored, it will change the count direction but if unconnected
the default direction is down, also if the "B" input is not brought out,
it will also default to counting down)
Last edit: 24 May 2020 04:26 by PCW.
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24 May 2020 11:30 #168782 by rodw
Replied by rodw on topic Z axis
I thought you were having the weekend off ! :huh:

motal2004 wrote: My plasma machine does have an arcok singal output...
I will re wire my Cnc pigtail to raw voltage and connect the arcOK signal in to the Mesa 7i96 board, and try again.


I think you said there were resistors in line with the raw arc voltage. Make sure you deduct that value from the resistance used to scale the THCAD. eg if there is a total of 200 k resistance and your scale calculation says to use a 3.9M resistor, you use 3.7M instead.
I'd also suggest you aim for a full scale of 200 volts until you get that Hypertherm! The maths is in the THCAD manual

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24 May 2020 11:45 #168783 by phillc54
Replied by phillc54 on topic Z axis

PCW wrote: (B is not ignored, it will change the count direction but if unconnected
the default direction is down, also if the "B" input is not brought out,
it will also default to counting down)

Is that why we set the scale to -1

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24 May 2020 12:15 #168786 by tommylight
Replied by tommylight on topic Z axis

phillc54 wrote:

PCW wrote: (B is not ignored, it will change the count direction but if unconnected
the default direction is down, also if the "B" input is not brought out,
it will also default to counting down)

Is that why we set the scale to -1

Me thinks so ! :)
Was wondering why is that always -1, now i know .
Thanks.

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