Integrating a BCL-AMP capacitive sensor to LinuxCNC
04 Apr 2024 22:04 #297599
by PCW
Replied by PCW on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
Its in the hostmot2 manual page (though you need LinuxCNC 2.10
to have the periodm module in the manual)
I can make firmware for the 7I76E with a periodm. Do you want it to use
a pin on the 7I76e encoder input? (I think the 7I96S version replaces the
7I76E encoder index with the periodm input)
to have the periodm module in the manual)
I can make firmware for the 7I76E with a periodm. Do you want it to use
a pin on the 7I76e encoder input? (I think the 7I96S version replaces the
7I76E encoder index with the periodm input)
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04 Apr 2024 22:18 #297600
by Uthayne
Replied by Uthayne on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
That firmware would be great.
While you're at it, can I get a firmware that uses 7i76e and 7i85s x1 on P1 please? Or perhaps duplicate for 7i85s on both P1 and P2 for future proofing.
The periodm pin can be on 7i76e encoder index is fine. 7i85s needs at least 2 encoder A inputs, and convert two of the stepgens to pwmgens so it will have 2 stepgens and 2 pwmgens.
Thanks!
While you're at it, can I get a firmware that uses 7i76e and 7i85s x1 on P1 please? Or perhaps duplicate for 7i85s on both P1 and P2 for future proofing.
The periodm pin can be on 7i76e encoder index is fine. 7i85s needs at least 2 encoder A inputs, and convert two of the stepgens to pwmgens so it will have 2 stepgens and 2 pwmgens.
Thanks!
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04 Apr 2024 22:37 #297604
by PCW
Replied by PCW on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
Do you need direction on the PWMgens?
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04 Apr 2024 23:03 #297607
by Uthayne
Replied by Uthayne on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
No
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04 Apr 2024 23:21 #297609
by shasse
Replied by shasse on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
Uthayne-
I've attached a zip file with the relevant config files. I'm using QtPlasmaC so the .prefs file is important as well. Since QtPlasmaC puts some limits on what are acceptable for the Arc Voltage Offset and the Arc Voltage Scale (it basically expects a MESA THCAD of some sort), for scaling I used a combo of encoder scaling in custom.hal:
# The QtPlasmaC GUI does not allow voltage offsets higher than 5 digits, so scale this down here
setp hm2_7i92.0.encoder.00.scale 100
and the offset and scale in the laser_cutter.prefs file:
[PLASMA_PARAMETERS]
Arc Voltage Offset = 22900
Arc Voltage Scale = 0.10
This leaves me with a ~50-100 range for "arc voltage" in the QtPlasmaC GUI and is sensitive enough to hold height well, at least for the values in the table that Taloot published a while back (0.5-1.5mm).
You might also be interested in the fake "ohmic" probing and fake "arc OK" signals I implemented in the custom.hal file:
I've attached a zip file with the relevant config files. I'm using QtPlasmaC so the .prefs file is important as well. Since QtPlasmaC puts some limits on what are acceptable for the Arc Voltage Offset and the Arc Voltage Scale (it basically expects a MESA THCAD of some sort), for scaling I used a combo of encoder scaling in custom.hal:
# The QtPlasmaC GUI does not allow voltage offsets higher than 5 digits, so scale this down here
setp hm2_7i92.0.encoder.00.scale 100
and the offset and scale in the laser_cutter.prefs file:
[PLASMA_PARAMETERS]
Arc Voltage Offset = 22900
Arc Voltage Scale = 0.10
This leaves me with a ~50-100 range for "arc voltage" in the QtPlasmaC GUI and is sensitive enough to hold height well, at least for the values in the table that Taloot published a while back (0.5-1.5mm).
You might also be interested in the fake "ohmic" probing and fake "arc OK" signals I implemented in the custom.hal file:
# Make a fake Ohmic probe based on the capacitive sensor
# Use the .velocity-rpm so the .velocity can be left unused for arc_ok
loadrt comp count=1
addf comp.0 servo-thread
net fake-ohmic-probe-in hm2_7i92.0.encoder.00.velocity-rpm comp.0.in0
setp comp.0.in1 930000.0
net plasmac:ohmic-probe comp.0.out
# ohmic output is comp.0.out
# Fake "Arc OK" signal that is always true
loadrt not count=1
addf not.0 servo-thread
setp not.0.in FALSE
net plasmac:arc-ok-in not.0.out
# ---OHMIC SENSE CONTACT DEBOUNCE---
setp plasmac.ohmic-sense-off-delay 3
setp plasmac.ohmic-sense-on-delay 3
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04 Apr 2024 23:29 #297610
by shasse
Replied by shasse on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
and since I like to be able to re-gen the config from pncconf, I made a python script to set the relevant values in the prefs file:
Scott
from qtvcp.lib.preferences import Access
import os
machineName = 'laser_cutter'
configPath = '/home/sector67/linuxcnc/configs/laser_cutter'
prefsFile = os.path.join(configPath, machineName + '.prefs')
prefs = Access(prefsFile)
prefs.putpref('Arc Voltage Offset', 22900, float, 'PLASMA_PARAMETERS')
prefs.putpref('Arc Voltage Scale', 0.10, float , 'PLASMA_PARAMETERS')
prefs.putpref('Float Switch Travel', 0.290, float , 'PLASMA_PARAMETERS')
prefs.putpref('Height Per Volt', 0.002, float , 'PLASMA_PARAMETERS')
prefs.putpref('Use keyboard shortcuts', True, bool, 'GUI_OPTIONS')
prefs.putpref('Ohmic probe enable', True, bool, 'ENABLE_OPTIONS')
prefs.putpref('THC enable', True, bool, 'ENABLE_OPTIONS')Scott
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04 Apr 2024 23:51 - 04 Apr 2024 23:53 #297612
by PCW
Replied by PCW on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
7I76E config with PeriodM on 7I76E encoder index and 2X 7I85S
each with 3 step/dir plus last stepgen channel replaced with
2X PWMgens. So 11 stepgens, 4 PWMgens and 9 encoders total.
each with 3 step/dir plus last stepgen channel replaced with
2X PWMgens. So 11 stepgens, 4 PWMgens and 9 encoders total.
Attachments:
Last edit: 04 Apr 2024 23:53 by PCW.
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05 Apr 2024 01:48 #297618
by phillc54
Replied by phillc54 on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
Most of QtPlasmaC is able to be customised.
You can change the range and the step rate of the spinboxes by having the following in a file named qtplasmac_custom.py in the config directory:
It would be nice to put together a custom file for use with fibre laser.
You can change the range and the step rate of the spinboxes by having the following in a file named qtplasmac_custom.py in the config directory:
self.w.arc_voltage_offset.setRange(-9, 9)
self.w.arc_voltage_offset.setSingleStep(1)
self.w.arc_voltage_scale.setRange(-9, 9)
self.w.arc_voltage_scale.setSingleStep(1)It would be nice to put together a custom file for use with fibre laser.
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05 Apr 2024 02:22 #297619
by shasse
Replied by shasse on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
Ah, that's very interesting! I'll try to keep track of customizations that would make sense as we continue to integrate our machine. I've been pretty pleased at how workable QtPlasmaC is "out of the box" for our simple fiber laser with very little additional customization.
On thing I've wondered is if there an existing thread or any discussion/thoughts on the possibility of adding additional properties to a material (e.g. laser focus height)? If not I'll start a separate thread. I expect that would take some doing.
Thanks!
Scott
On thing I've wondered is if there an existing thread or any discussion/thoughts on the possibility of adding additional properties to a material (e.g. laser focus height)? If not I'll start a separate thread. I expect that would take some doing.
Thanks!
Scott
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05 Apr 2024 02:30 #297620
by phillc54
If we did have a fibre laser mode we could do it there.
Replied by phillc54 on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC
We could possibly add a fibre laser mode into QtPlasmaC and integrate any required changes into the base code.Ah, that's very interesting! I'll try to keep track of customizations that would make sense as we continue to integrate our machine.
Not that I am aware of.One thing I've wondered is if there an existing thread or any discussion/thoughts on the possibility of adding additional properties to a material (e.g. laser focus height)?
Yes, it probably would. I will look into it.I expect that would take some doing.
If we did have a fibre laser mode we could do it there.
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