Snuggly's Plasma Build

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12 Jan 2019 19:45 - 12 Jan 2019 19:47 #124040 by PCW
Replied by PCW on topic Snuggly's Plasma Build
GPIO11 is _not_ the input common pin (nor is the input common pin readable)

GPIO11 toggles because you are reading one of the SSR output driving pins (which are 1MHz square waves) so you will read random high/low values on this (and other) GPIO pins that are not associated with actual simple input pins, that is, all pins are readable as GPIO even if they have alternate functions.

You can for example also read the stepgen output pins as GPIO...
Last edit: 12 Jan 2019 19:47 by PCW.
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12 Jan 2019 22:03 #124051 by snugglylovemuffin
interesting. So it looks like everything is wired properly and the joint 3 limit is caused by something else.

Increasing soft limits didn't relieve the issue unfortunately. I've commented the line out for now while I figure out my z axis crashing issue.

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15 Jan 2019 15:54 #124236 by andypugh
Replied by andypugh on topic Snuggly's Plasma Build
Joint.3.limit means that the limt switch has been triggered. It might have really been triggered, or it might simply be electrical noise or mechanical vibration.

I tend to run my limit switches through a software debounce (in HAL). And quite a long one, 10mS or so.
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15 Jan 2019 17:31 #124248 by islander261
Replied by islander261 on topic Snuggly's Plasma Build
I don't believe Snuggly has an actual limit switch on his Z axis.

The THC.hal he is using sets all three joint.3. hal switch pins to true when the logic thinks there is a Z axis error OR when it thinks the float switch (FloatSwitch) pin is true AND some logic of the M3 code (spindle.0.forward) and the torch state.

net TriggerLimit or2.2.out => joint.3.neg-lim-sw-in joint.3.pos-lim-sw-in joint.3.home-sw-in

net FloatAndTorchOn and2.5.out => or2.2.in1
#net LimitZ hm2_7i96.0.gpio.006.in_not => or2.2.in0

This is Tommy's hal so I will leave the logic functional details to him.

John
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17 Jan 2019 03:52 #124316 by snugglylovemuffin
I've been trying to make sense of the code and my intuition was the same on the FloandAndTorchOn. I do have a limit on my Z axis, but it's commented out right now.

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18 Jan 2019 17:51 #124407 by snugglylovemuffin
I cannot, no matter what I've tried, figure out why my Z axis crashes into the material and starts dragging itself across the surface and if I stop it, it locks up the machine. I've slowed the acceleration, increased it's soft limits checked ferror and nothing...

Why won't it offset after it hits the float and then try to fire the torch?

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18 Jan 2019 18:24 - 18 Jan 2019 18:27 #124408 by islander261
Replied by islander261 on topic Snuggly's Plasma Build
Do you have jogging control over the Z axis when in manual mode? This must work first!

Review all the notes in the thc-toma-stepper-final package. Make sure that your values make sense for an imperial units system. Pay particular attention to the signs of the parameters you enter. The switch offset (SwitchTravel) and pierce gap (PierceGap) both can cause big problems if the signs are wrong! Slow your Z axis response way down for openners, use a velocity of .1 ips and an acceleration of 5ips^2(these must be changed for both the axis and joint in the .ini), you can set it back to the correct range you established during your initial calibration after the motion is correct.

Manually create a simple Gcode file to test with. Just a single cut, either a straight line (6" to 8" long) or a rectangle. You will need the single straight line file for speed/voltage testing later anyways. Copy the format Tommy used in the cncbytoma.ngc file ( this file appears to have been generated by Gcodetools), this is in the thc-toma package, your file will have only one cut and only be a few lines long. Post the file here so we can see what is supposed to happen. A detailed description or video of any problems using the simple file will help the group figure out what may be wrong. Also single stepping the program will help determine which action is the problem.

John
Last edit: 18 Jan 2019 18:27 by islander261. Reason: Added single stepping.

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18 Jan 2019 19:25 #124414 by snugglylovemuffin
I can jog every axis. I did adjust the inputs on the THC gui to imperial and specifically to my system. I will slow the z axis down further and write a simple gcode linear cut as you suggested. If it does not work properly, I will upload a video showing the error.

Thank you.

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