Nan - voltage

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23 Sep 2020 07:44 #183425 by Tesremos
Replied by Tesremos on topic Nan - voltage
also, it dosent sort its self out..once it boots with a nan..

it stays nan until you reopen linuxcnc.

if u run with nan. it crashes.


or from memory. if mode 0.

never reaches arc okay. and dosent do anyrhing but pop a hole in stuff.
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23 Sep 2020 07:46 #183426 by phillc54
Replied by phillc54 on topic Nan - voltage
Does it ever show a nan at some later stage or only on startup?

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23 Sep 2020 08:23 #183429 by Tesremos
Replied by Tesremos on topic Nan - voltage
only ever on startup.


maaaayyybbeee once ive seen it "appear"
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23 Sep 2020 11:09 - 23 Sep 2020 11:10 #183450 by Clive S
Replied by Clive S on topic Nan - voltage

Does it ever show a nan at some later stage or only on startup?


Phill. Not sure this is relevant but recently I have been playing around with denounce like this:

setp scale.0.gain 60
setp lowpass.0.gain 1.000000
net spindle-velocity-feedback-rps => lowpass.0.in
net spindle-fb-filtered-rps lowpass.0.out => abs.0.in
net spindle-fb-filtered-abs-rps abs.0.out => scale.0.in
net spindle-fb-filtered-abs-rpm scale.0.out => pyvcp.spindle-speed

Using 2.8 on a P/port with lathe for spindle display from a 100 slot disk with opto's

That is I have seen nan in the display with some odd setting in the gain.
Last edit: 23 Sep 2020 11:10 by Clive S.
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23 Sep 2020 11:15 #183451 by phillc54
Replied by phillc54 on topic Nan - voltage
Thanks Clive, it is a bit different. We are getting an inf (infinity) from the encoder on startup and because we do a bit of math with it we ended up with a nan.
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27 Sep 2020 00:58 #183906 by Tesremos
Replied by Tesremos on topic Nan - voltage
:) still no nan :)
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27 Sep 2020 01:36 #183908 by phillc54
Replied by phillc54 on topic Nan - voltage

:) still no nan :)


Great, thanks for reporting.

It would be nice to know why it does appear. When I get a spare minute I may pose the question on the developers list.

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28 Sep 2020 10:25 #184130 by Tesremos
Replied by Tesremos on topic Nan - voltage
im quite happy to guinea pig things, let me know if you need anything :)
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29 Sep 2020 02:24 #184234 by phillc54
Replied by phillc54 on topic Nan - voltage

im quite happy to guinea pig things, let me know if you need anything :)

I'll keep that in mind. :)

I have pushed those changes to 2.8 and master.

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