Looking for the cheapest plasma cutter that will work with Mesa THCAD

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15 Jan 2020 14:57 #154924 by calvin.d
thats great, please keep posting progress.

C

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15 Jan 2020 16:39 #154932 by tommylight

BlueManRising wrote: .......... took me a good 3 days to finally get my 7i96 Mesa board working (install of Linux 3 times.


Hmmmm......to late, but :
forum.linuxcnc.org/9-installing-linuxcnc...installation?start=0

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15 Jan 2020 22:36 #154963 by BlueManRising
Tommy, thanks hahaha wish I found that...

Ok so did some recon, the 55i or herocut55 (has so many names) reads out the CNC "voltage output pin" 1:1, so I just test cut and had my wife look at the Voltage Meter, roughly 130-145 volts. Now there was a initial start that was a little over the place, reading 600-700-800 and any number in between for a solid half second, then jumped down to the 130-140 range. I tried it on a bunch of amp settings too, all about the same readings.

Next is hooking up Mesa and seeing what voltage I get based on the settings.

I'll let you guys know what I find.

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15 Jan 2020 22:44 #154964 by rodw

BlueManRising wrote: Tommy, thanks hahaha wish I found that...

I just test cut and had my wife look at the Voltage Meter, roughly 130-145 volts. Now there was a initial start that was a little over the place, reading 600-700-800 and any number in between for a solid half second.


That is normal. 130-145 is in the range. and th ebig peak on piercing is why you delay before auto sampling torch voltage.

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15 Jan 2020 23:21 #154972 by BlueManRising
Ok, so just plugged in the Mesa THCad board, got a normal reading 4.517v DC, figured this was normal since the board is calling for 5v, but when I took my reading after torch start on the F/1 jumper setting it read .1v higher, so it was reading only 4.613, so is this right? Or should I be getting something else, haven't tried another F/32 yet, but I'm gonna try after dinner, more to come, anyone else get these readings?

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15 Jan 2020 23:41 #154974 by BlueManRising
Just changed THCad-300 to f/32 jumper, reading 4.5 mV when torch is on it goes to .2mV and .3mV... Maybe this is why everyone says to use the THCad-10...? Any insight would be appreciated, also maybe I hooked it up backwards, gonna try flipping the input, read on another board there is polarization..

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15 Jan 2020 23:47 #154975 by BlueManRising
Sorry Calvin for stealing your forum lol ok, just switched to bi-polar mode, reading 2.49v (DC) when tourch is on reading 4.41v (DC) so I'm assuming it's doing something different lol

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16 Jan 2020 00:04 #154977 by BlueManRising
Ok so after some thinking and moving the torch higher and lower on the material, I'm definitely getting readings close to 1.5v fluctuation, looking at the discussion earlier about the resistors, I can see why they recommend one, it's naturally reading 2.5v standard. It does change going further and closer, so I'm assuming I'm gonna have to decided the readings at the computer and have the controller go up and down based on the reading. I'm finished in the garage tonight, I'll get back to more info once anyone has some insight, but it's been a fun night of testing. (fyi hooking up the wires from the pin 1 and 2 from the 55i, only made the readings go negative, and keeping it in bi-polar mode keeps the numbers normal) gonna do more research and see what I can find.

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16 Jan 2020 00:08 #154979 by thefabricator03

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16 Jan 2020 00:16 #154981 by BlueManRising
Thank you, good read! Definitely gonna dive into it further but explains way more than I thought. Thanks for the heads up, exactly what I was looking for, it's based on frequency out not voltage, so disregard my voltage comments cause it doesn't mean anything hahaha ok plasma 1, me 0

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