Spindle speed variation ssv for chatter control
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04 Feb 2021 22:35 - 04 Feb 2021 23:35 #197689
by PCW
Replied by PCW on topic Spindle speed variation ssv for chatter control
A _very_ minimal example:
loadrt siggen
addf siggen.0.update servo thread
setp siggen.0.frequency 1 # 1 Hz
setp siggen.0.amplitude 50 # +-50 RPM
net spindle-speed => siggen.0.offset
net mod_spindle_speed <= siggen.0.sine
net mod_spindle_speed => your-spindle-hardware-speed-pin
loadrt siggen
addf siggen.0.update servo thread
setp siggen.0.frequency 1 # 1 Hz
setp siggen.0.amplitude 50 # +-50 RPM
net spindle-speed => siggen.0.offset
net mod_spindle_speed <= siggen.0.sine
net mod_spindle_speed => your-spindle-hardware-speed-pin
Last edit: 04 Feb 2021 23:35 by PCW. Reason: even more minimal
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- rodw
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05 Feb 2021 04:43 #197705
by rodw
Replied by rodw on topic Spindle speed variation ssv for chatter control
I started to look at this but PCW has done it already. If you read the docs
linuxcnc.org/docs/devel/html/man/man9/siggen.9.html
and review what each pin does will clarify what is happening.
linuxcnc.org/docs/devel/html/man/man9/siggen.9.html
and review what each pin does will clarify what is happening.
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05 Feb 2021 11:09 #197722
by robertspark
thanks
this shows just what I needed as I sort of get linuxcnc but with the above example it shows how to load the component, add it to the thread, set the parameters, and then apply those to an existing net / wire and output it.
thanks, invaluable (it's one thing reading the manual but another to see a simple example of just the one element instead of all the other bits / components which can obfuscate what you are trying to understand or break it down to )
Replied by robertspark on topic Spindle speed variation ssv for chatter control
A _very_ minimal example:
loadrt siggen
addf siggen.0.update servo thread
setp siggen.0.frequency 1 # 1 Hz
setp siggen.0.amplitude 50 # +-50 RPM
net spindle-speed => siggen.0.offset
net mod_spindle_speed <= siggen.0.sine
net mod_spindle_speed => your-spindle-hardware-speed-pin
thanks
this shows just what I needed as I sort of get linuxcnc but with the above example it shows how to load the component, add it to the thread, set the parameters, and then apply those to an existing net / wire and output it.
thanks, invaluable (it's one thing reading the manual but another to see a simple example of just the one element instead of all the other bits / components which can obfuscate what you are trying to understand or break it down to )
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05 Feb 2021 11:14 - 05 Feb 2021 11:41 #197723
by andypugh
Replied by andypugh on topic Spindle speed variation ssv for chatter control
The next step would be to set up some
custom M-codes
to turn the behaviour on and off.
For example a file called M100 to turn it on.
Save that code to a file called "m100" in your nc_files folder (probably. I am not at a LinuxCNC machine at the moment. Check the docs above as regards the search path). Then make the file executable. (right-click on it in the GUI and select properties)
Thenwould enable the feature at 2Hz and 20 rpm amplitude.
You might also want an M101 to turn it off
For example a file called M100 to turn it on.
#! /bin/bash
#!/bin/bash
frequency=$1
amplitude=$2
halcmd setp siggen.0.reset 0
halcmd setp siggen.0.frequency $frequency
halcmd setp siggen.0.amplitude $amplitude
exit 0Save that code to a file called "m100" in your nc_files folder (probably. I am not at a LinuxCNC machine at the moment. Check the docs above as regards the search path). Then make the file executable. (right-click on it in the GUI and select properties)
Then
M100 P2 Q20You might also want an M101 to turn it off
#! /bin/bash
halcmd setp siggen.0.reset 1
return 0
Last edit: 05 Feb 2021 11:41 by andypugh. Reason: There is no "enable" for siggen
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05 Feb 2021 11:21 #197724
by robertspark
Replied by robertspark on topic Spindle speed variation ssv for chatter control
thanks Andy, again invaluable for a simple thing and to see how it's implimented
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05 Feb 2021 11:43 #197729
by andypugh
It would have been better if it was correct.
siggen does not have an "enable" but it does have a "reset" which locks the output to (offset + 0) which is what we want.
I have edited my example.
Replied by andypugh on topic Spindle speed variation ssv for chatter control
thanks Andy, again invaluable for a simple thing and to see how it's implimented
It would have been better if it was correct.
siggen does not have an "enable" but it does have a "reset" which locks the output to (offset + 0) which is what we want.
I have edited my example.
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05 Feb 2021 11:43 - 05 Feb 2021 11:46 #197730
by rodw
Replied by rodw on topic Spindle speed variation ssv for chatter control
Andy has proposed a nice elegant solution but you could also use M67/M68 and M62/M63 or M64/M65 which would not require the bash scriptsRef:
Digital output linuxcnc.org/docs/html/gcode/m-code.html#mcode:m62-m65
Analog output linuxcnc.org/docs/html/gcode/m-code.html#mcode:m67
It just goes to show there are many ways to skin a cat in Linuxcnc.
Wait till we show you how to write your own components if you are that way inclined!
net frequency <= motion.analog-output-00
net amplitude <= motion.analog-output-01
net frequency => siggen.0.frequency
net amplitude => siggen.0.amplitude
net sigenable <= motion.digital-output-00
net sigenable => siggen.0.resetDigital output linuxcnc.org/docs/html/gcode/m-code.html#mcode:m62-m65
Analog output linuxcnc.org/docs/html/gcode/m-code.html#mcode:m67
It just goes to show there are many ways to skin a cat in Linuxcnc.
Wait till we show you how to write your own components if you are that way inclined!
Last edit: 05 Feb 2021 11:46 by rodw. Reason: update to use reset
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05 Feb 2021 11:52 #197731
by andypugh
Including, it seems, remapping the "S" command.
linuxcnc.org/docs/html/remap/remap.html#...ng_codes_s_m0_m1_m60
So with a bit of work behind the scenes you could use "M3 S1000 P2 Q20" (or, possibly, any other letters as the control words, but probably not the obvious "F" and "A" as those have specific meanings.)
Replied by andypugh on topic Spindle speed variation ssv for chatter control
It just goes to show there are many ways to skin a cat in Linuxcnc.
Including, it seems, remapping the "S" command.
linuxcnc.org/docs/html/remap/remap.html#...ng_codes_s_m0_m1_m60
So with a bit of work behind the scenes you could use "M3 S1000 P2 Q20" (or, possibly, any other letters as the control words, but probably not the obvious "F" and "A" as those have specific meanings.)
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05 Feb 2021 12:08 #197733
by rodw
Steady up Andy, you'll have poor old Robert's head spinning!
But it is an interesting concept to explore... If you tried them all, you would learn a lot about Linuxcnc.
Replied by rodw on topic Spindle speed variation ssv for chatter control
So with a bit of work behind the scenes you could use "M3 S1000 P2 Q20"
Steady up Andy, you'll have poor old Robert's head spinning!
But it is an interesting concept to explore... If you tried them all, you would learn a lot about Linuxcnc.
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05 Feb 2021 13:49 #197742
by robertspark
Thanks Gents
Not too many options please, head is already spinning and I am just starting out. Give it 6-12m and maybe I'll get to advance to the next class.
(too many options in Linux (not just the cnc bit) that becomes overwhelming to new users, yes I know it's flexibility and options.... sometimes just learning the basics is useful [I only learnt to use TAB in terminal to auto fill in the file names a month ago + '&' to start an instance using the same terminal window....... {I just can't remember how you start multiple instances from 1 terminal {something like '&6' but it didn't like that when I tried it}) All new stuff and good stuff to learn.
(I'd like to get into components but its baby steps + need, LCNC has so many options / components already, I can't think of something I need that doesn't already exist {yet})
Replied by robertspark on topic Spindle speed variation ssv for chatter control
So with a bit of work behind the scenes you could use "M3 S1000 P2 Q20"
Steady up Andy, you'll have poor old Robert's head spinning!
But it is an interesting concept to explore... If you tried them all, you would learn a lot about Linuxcnc.
Thanks Gents
Not too many options please, head is already spinning and I am just starting out. Give it 6-12m and maybe I'll get to advance to the next class.
(too many options in Linux (not just the cnc bit) that becomes overwhelming to new users, yes I know it's flexibility and options.... sometimes just learning the basics is useful [I only learnt to use TAB in terminal to auto fill in the file names a month ago + '&' to start an instance using the same terminal window....... {I just can't remember how you start multiple instances from 1 terminal {something like '&6' but it didn't like that when I tried it}) All new stuff and good stuff to learn.
(I'd like to get into components but its baby steps + need, LCNC has so many options / components already, I can't think of something I need that doesn't already exist {yet})
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