can i use linuxcnc without it's PID loop?

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14 May 2019 09:23 #133713 by skvallab
can i use linuxcnc as just a step generator ?
without it's PID loop.

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14 May 2019 10:34 #133719 by pl7i92
Yes you can
install latest wheezy stay on 2.7.14

BUT it gives you more benefit if make the pidloop work
its only once you got the things sorted
BESt to use wizard for base config and copy your privete things over
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14 May 2019 15:27 #133764 by skvallab
i understand PID can do a great job, but i have a servo drive which does it good enough for my simple application (NO machining involved ).
can you please guide me through how to do it,
i have a pico systems Universal Stepper Controller (Via parallel port)

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14 May 2019 18:00 #133779 by cmorley
Looking at the docs - it seems the Pico card does not have a step generator that supports position mode with an internal PID.

So unless you switch to Mesa or parallel port hardware, you are stuck with PID.

I know with the Mesa card the PID setting is pretty standard to get good results with the standard servo period.
P = 1000 FF = 1

Chris M
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14 May 2019 18:05 #133780 by cmorley
Maybe you are looking for a simple trejectory planner for your non machining application?

simple_tp is a single axis trajectory planner that takes a target position and gives a velocity signal

oprn a teminal and type 'man simple_tp'
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19 May 2019 22:24 #134295 by tommylight

skvallab wrote: can i use linuxcnc as just a step generator ?
without it's PID loop.

Yes.
Linuxcnc has its pid loop just in case you need it for steppers.

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19 May 2019 22:29 #134296 by cmorley
Tommylight - if he is using Pico step generation - then according to the docs he must use velocity mode.

Chris M
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20 May 2019 00:06 #134310 by tommylight
Sorry, I missed that.
Reading through over 400 posts last night, 3 weeks of backlog, was bussy.
Thank you very much, C.

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