Limit Spindle RPM and Feed for Touch probe

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07 Dec 2018 21:30 #122022 by 3D-Master
Hi,

is it possible to limit the Spindle rpm and jog feed (possibly jog rapid aswell) to specified values if i call the touch probe? (for example 100 rpm and f1000 /f2000 rapid) i dont want to accidentally spool the touch probe up to 8000 rpm or crash it with 10.000mm/min

thanks

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08 Dec 2018 04:00 #122032 by cmorley
I feel there is an answer to this but can't find the HAL pin required.
I thought there was a pin that told you what motion mode linuxcnc was currently using.
If there is you could possibly use that to limit rpm and feed rate using HAL infrastructure.
Maybe someone else will pick up on my idea and find the pin :)

Chris M

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08 Dec 2018 04:11 #122033 by andypugh
motion.motion‚ąítype OUT S32
These values are from src/emc/nml_intf/motion_types.h
0: Idle (no motion)
1: Traverse
2: Linear feed
3: Arc feed
4: Tool change
5: Probing
6: Rotary unlock for traverse

You could use that to intervene (limit1?) between spindle commands and the driver, and also to apply a fixed feed-override, all in HAL.

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08 Dec 2018 04:19 #122035 by cmorley
thanks Andy.
I see motion.motion-type is not documented in the HTML online docs...
Or maybe I'm blind...

Chris M

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08 Dec 2018 04:37 #122036 by rodw
Nah, its there. search for type on this page
linuxcnc.org/docs/devel/html/man/man9/motion.9.html

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08 Dec 2018 05:54 #122044 by cmorley

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09 Dec 2018 18:06 #122108 by fc60
Greetings,

I find this most interesting and have a use for it.

Would someone paste some sample code that limits the spindle to 100RPM and feed to 10IPM?

Is this code something you paste into the normal *.cnc file?

Thanks, in advance,

Dave

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10 Dec 2018 11:20 #122132 by andypugh

fc60 wrote: Would someone paste some sample code that limits the spindle to 100RPM and feed to 10IPM?

Is this code something you paste into the normal *.cnc file?


It can't always be simply pasted in, depending on whether the halui overrides are already in use. So you would need to understand your HAL file to know where it needed to be edited.
Using halui is only one way, and might not be the best way. For the spindle a limit block in the path from motion to pwm would probably be better.
loadrt mux_generic config="ss7,ss7"
#motion-type is signed, mux-generic needs unsigned
loadrt conv_232_u32 count=1
...
addf conv_s32_u32.0   servo-thread
addf mux-gen.0       servo-thread
addf mux-gen.1       servo-thread
...
net select-motion-type-signed  motion.motion-type =>conv_s32_u32.0.in
net select-motion-type-unsigned conv_s32_u32.0.out =>  mux-gen.00.sel-int mux-gen.01.sel-int
net mux-gen.00.out-s32 => halui.spindle-override.counts
net mux-gen.01.out-s32 => halui.max-velocity.counts

setp halui.spindle-override.direct-value 1
setp halui.spindle-override.scale 100
setp mux-gen.00.in-s32-00 100
setp mux-gen.00.in-s32-01 100
setp mux-gen.00.in-s32-02 100
setp mux-gen.00.in-s32-03 100
setp mux-gen.00.in-s32-04 100
setp mux-gen.00.in-s32-05 5
setp mux-gen.00.in-s32-06 100

setp halui.max-velocity.direct-value 1
setp halui.max-velocity.scale 100
setp mux-gen.01.in-s32-00 100
setp mux-gen.01.in-s32-01 100
setp mux-gen.01.in-s32-02 100
setp mux-gen.01.in-s32-03 100
setp mux-gen.01.in-s32-04 100
setp mux-gen.01.in-s32-05 10
setp mux-gen.01.in-s32-06 100
Provided untested and without warranty.

The numbers will need to be tweaked to suit your particular machine, I expect. Specifically the velocity scale needs to be max velocity and the limit for other motion types needs to be set to the same value. For the spindle the scaling is a ratio, so probably won't actually work as-is except to prevent the spindle turning altogether with an override of zero.

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09 Mar 2019 13:14 #128160 by 3D-Master
Where can i find out what various configs do?

loadrt mux_generic config="ss7,ss7"


i found out that the number in "ss7" means how many pins are available for a mux, but what does the "ss" say and where can i find all possible configs?

thanks

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09 Mar 2019 13:26 #128161 by andypugh
linuxcnc.org/docs/2.7/html/man/man9/mux_generic.9.html

ss7 means "signed integer input, signed integer output, select one of 7"

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