Python Interface Feed Hold

JT
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03 May 2024 12:39 - 03 May 2024 12:43 #299622 by JT

Python Interface Feed Hold was created by JT

The python interface feed hold doesn't work for some reason. I can watch the feed hold status change from false to true but the program keeps running in a feed move.

Anyone have a clue what's wrong?

Edit: M53 is on.

JT

Last edit: 03 May 2024 12:43 by JT.

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andypugh
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03 May 2024 13:26 #299627 by andypugh

Replied by andypugh on topic Python Interface Feed Hold

Maybe you need to enable fedd-hold and/or issue a G53?

linuxcnc.org/docs/stable/html/gcode/m-code.html#mcode:m53

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JT
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03 May 2024 13:41 #299629 by JT

Replied by JT on topic Python Interface Feed Hold

M53 is enabled and I can see feed hold toggle from false to true in the status.

The only thing in the python interface is set_feed_hold(int), I don't see any other way to enable is except M53.

JT

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andypugh
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03 May 2024 14:23 #299633 by andypugh

Replied by andypugh on topic Python Interface Feed Hold

Maybe the Python interface is exactly the same as a G53, in that all it does is enable the feed-hold HAL pin?

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JT
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03 May 2024 14:26 #299634 by JT

Replied by JT on topic Python Interface Feed Hold

Thanks I'll check in a bit.

JT

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JT
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03 May 2024 16:01 - 03 May 2024 16:07 #299642 by JT

Replied by JT on topic Python Interface Feed Hold

Toggling M53 and toggling the set_feed_hold from the python interface don't change motion.feed-hold. Even setting motion.feed-hold to true doesn't stop feed moves.

Edit: motion.feed-inhibit stops all motion feed and rapid

JT

Last edit: 03 May 2024 16:07 by JT.

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JT
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03 May 2024 17:27 #299646 by JT

Replied by JT on topic Python Interface Feed Hold

Ok in Axis if M53 is active toggling motion.feed-hold works so it makes me wonder if the GUI is doing it.

JT

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cmorley
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03 May 2024 18:57 #299662 by cmorley

Replied by cmorley on topic Python Interface Feed Hold

I think python's feed-hold and M53 are the same thing.
it should have been called feed-hold-enable
I the python module it calls the NML message:
EMC_TRAJ_SET_FH_ENABLE

There seems not to be a equivalent to motions feed-hold in python.
probably nml message:
EMC_TRAJ_HALT_TYPE

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cmorley
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03 May 2024 19:39 #299666 by cmorley

Replied by cmorley on topic Python Interface Feed Hold

m53 and python's feed_hold just control a switch for the motion.feed-hold HAL pin.

that pin is used in control.c to set the feed scaling to 0.

if ( enables & FH_ENABLED ) {
/* read feed hold HAL pin */
if ( *emcmot_hal_data->feed_hold ) {
scale = 0;
}

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JT
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03 May 2024 20:53 - 03 May 2024 20:53 #299672 by JT

Replied by JT on topic Python Interface Feed Hold

Chris, thanks for clearing that up.

I just did some testing and python feed-hold true, M53 off and motion.feed-hold stops motion.

With python feed-hold false and M53 active motion.feed-hold does not stop motion.

JT

Last edit: 03 May 2024 20:53 by JT.

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