THCAD-10

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29 Aug 2018 16:48 #116790 by BigJohnT
Replied by BigJohnT on topic THCAD-10
Maybe the man page can be of some help.
linuxcnc.org/docs/2.7/html/man/man9/thc.9.html

The scale offset is subtracted from the frequency then the result is multiplied by the scale.So 806,000 -118,000 = 688,000 10 / 688,000 = 0.0000145 which is the scale.

JT
The following user(s) said Thank You: kb8wmc
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29 Aug 2018 16:49 #116791 by PCW
Replied by PCW on topic THCAD-10
The offset/scale to convert from frequency to volts is something that thc-pid deals with.

Take a look at the encoder velocity output with halmeter, if the encoder scale is 1 (or -1) this will be in Hz and should be 118000 at 0 Vin
if it reads ~ -118000, you will need to change the encoder scale to -1
(currently the encoder scale is no set which means it is using the default value of 1)

_nothing_ will work as expected if the frequency reads as negative
The following user(s) said Thank You: kb8wmc
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29 Aug 2018 17:12 #116793 by kb8wmc
Replied by kb8wmc on topic THCAD-10
JT, Thanks a million John...I have read your manual page several times before, but did not comprehend it...That portion which provides the "scale" is now more clear to me...I still have lots to learn about this...

It is more clear to me now than it was 10 minutes ago...

Mike
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29 Aug 2018 19:04 #116808 by kb8wmc
Replied by kb8wmc on topic THCAD-10
PCW...
The thc_pid.encoder-vel shows approximately somewhere around 3690 as an average...
The thc-pid.scale-offset shows a positive number 118000...

I have changed the thc.pid.vel-scale to 0.0000145

We will test this out when my brother gets home this evening and will let you know how it goes...

Thanks for all your help and to JT also...
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29 Aug 2018 19:11 #116812 by PCW
Replied by PCW on topic THCAD-10
OK that means that means you are using the divided by 32 mode so the offset is 118000/32 = 3687.5 and the scale is 32x10/688000 = .0004651
The following user(s) said Thank You: kb8wmc
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29 Aug 2018 20:28 - 29 Aug 2018 20:41 #116823 by kb8wmc
Replied by kb8wmc on topic THCAD-10
PCW...I should have made mention before that I set the jumper to 32...Sorry bout that...but I now have a better comprehension of the settings to be used in for the encoder...

Anything else I should be looking for that you can think of?

MIke

P.S.
I am going to add a file containing an example or examples so that both I and my brother can remember how this all works together...
Last edit: 29 Aug 2018 20:41 by kb8wmc. Reason: memory limitations
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29 Aug 2018 23:02 #116831 by kb8wmc
Replied by kb8wmc on topic THCAD-10
Update: Well, back home after testing...No Joy!...We are still having the same issue with the torch quickly moving away from the workpiece after lowering to he specified cut height (0.06')...Tommylight mentioned that the torch voltage is set too high...

We are following the settings set forth in the Hypertherm Powermax 45 manual, which, for this material thickness (3/16"), at 45 amps and 118 volts...

Using Sheetcam to generate the gcode and setting the prescribed voltage therein, when starting the cutting process that voltage (118V) is imported into LCNC thanks to JT's M68 command...Thinking that simply lowering the input voltage in the gcode, I edited the gcode to set voltage to 70 volts and then down to 50 volts without success...The torch still runs away from the workpiece...

I still get only two signals on the panel, one for vel-status and one for arc-ok...The volts-under and volts-high are not responding at all...

I am at a loss to know where to look and what to do...

Mike
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29 Aug 2018 23:23 #116832 by PCW
Replied by PCW on topic THCAD-10
unless the thc.pid.volts is correct all bets are off
Thats the thing that should have been verified first
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30 Aug 2018 02:01 #116833 by rodw
Replied by rodw on topic THCAD-10
Hi guys, just wondering where you have got the thc-pid component from?
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30 Aug 2018 12:32 #116847 by BigJohnT
Replied by BigJohnT on topic THCAD-10
I wrote that a couple of years ago.

JT
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