Almost a year ago I converted my servo'd Bridgeport/Boss to LinuxCNC and it works sooo much better than that old and slow 68000 control that I've been reluctant to change anything. The only remaining todo is to convert the spindle speed control from the current mechanical switch to machine/digital control, and it's a perfect winter project.
To that end I've set up as a small test bed in the comfort of my home with a 5i25/7i76 controlling 3 steppers, 3 home switches, and a PWM driven DC motor. I configured LCNC-2.7.14 with pncConf using "5i25-internal Data" and "7i76x2 - With one 7i76". All steppers, switches, homing, etc work as expected. I've fabricated a rotary encoder with slots and an IR sensor for the motor that outputs +5v pulses and verified it with an oscilloscope. The DC motor speed is currently controlled with a pot wiper on a small PWM driver board. The goals of this test bed are to show spindle RPM , control the DC motor with 0-5vdc from the 7i76 , and use knowledge gained to convert the BP.
My first goal was to simply show the RPM on the Pyvcp spindle speed panel, so in addition to the 3 stepgens, I also enabled encoder 0 in pncConf by selecting the "i/o connector 3" tab, and changed the "unused Spindle Encoder 0" dropdown to "Spindle Encoder 0". I then attached the output of my encoder to TB3 pin 7, which according to the 7i76 manual, should be ENCA+. Got no RPM indication on the panel, so I verified that I had pulses on TB3-7 with my scope. Next I did a dmesg and saw that encoder #0 had been instantiated on Port 3-13, and checked my .hal file to make sure that encoder.00.counter-mode was set to 1, (as I only have an A input). I then looked at the hal configuration and put a watch (also halmeter) on a number of pins associated with spindle and encoder to ensure machine was homed, spindle was enabled, and to look for any changes on hm2_5i25.encoder.00.input-a, but nothing. Toggling the home switches, and the axis spindle enable button showed that my pin watches were working as expected, and that the spindle was truly enabled. All good. I'm to the point where I'm wondering if TB3 pin 7 is the correct input, or if I should be using a different 7i76 input pin. I'm somewhat of a hal newby, and although I feel I understand the basics, I have a lot more to learn. Thanks in advance for any help you can offer. Hal and ini files attached.
Brent
# Generated by PNCconf at Tue Jan 14 11:43:52 2020 # If you make changes to this file, they will be # overwritten when you run PNCconf again loadrt trivkins loadrt [EMCMOT]EMCMOT servo_period_nsec=[EMCMOT]SERVO_PERIOD num_joints=[TRAJ]AXES loadrt hostmot2 loadrt hm2_pci config=" num_encoders=1 num_pwmgens=0 num_stepgens=4 sserial_port_0=20xxxx" setp hm2_5i25.0.watchdog.timeout_ns 5000000 loadrt pid names=pid.x,pid.y,pid.z,pid.s loadrt abs names=abs.spindle loadrt lowpass names=lowpass.spindle loadrt scale names=scale.spindle loadrt near addf hm2_5i25.0.read servo-thread addf motion-command-handler servo-thread addf motion-controller servo-thread addf pid.x.do-pid-calcs servo-thread addf pid.y.do-pid-calcs servo-thread addf pid.z.do-pid-calcs servo-thread addf pid.s.do-pid-calcs servo-thread addf scale.spindle servo-thread addf abs.spindle servo-thread addf lowpass.spindle servo-thread addf near.0 servo-thread addf hm2_5i25.0.write servo-thread # external output signals # external input signals # --- HOME-X --- net home-x <= hm2_5i25.0.7i76.0.0.input-00 # --- HOME-Y --- net home-y <= hm2_5i25.0.7i76.0.0.input-01 # --- HOME-Z --- net home-z <= hm2_5i25.0.7i76.0.0.input-02 #******************* # AXIS X #******************* setp pid.x.Pgain [AXIS_0]P setp pid.x.Igain [AXIS_0]I setp pid.x.Dgain [AXIS_0]D setp pid.x.bias [AXIS_0]BIAS setp pid.x.FF0 [AXIS_0]FF0 setp pid.x.FF1 [AXIS_0]FF1 setp pid.x.FF2 [AXIS_0]FF2 setp pid.x.deadband [AXIS_0]DEADBAND setp pid.x.maxoutput [AXIS_0]MAX_OUTPUT setp pid.x.error-previous-target true setp pid.x.maxerror .0005 net x-index-enable <=> pid.x.index-enable net x-enable => pid.x.enable net x-pos-cmd => pid.x.command net x-vel-cmd => pid.x.command-deriv net x-pos-fb => pid.x.feedback net x-output => pid.x.output # Step Gen signals/setup setp hm2_5i25.0.stepgen.00.dirsetup [AXIS_0]DIRSETUP setp hm2_5i25.0.stepgen.00.dirhold [AXIS_0]DIRHOLD setp hm2_5i25.0.stepgen.00.steplen [AXIS_0]STEPLEN setp hm2_5i25.0.stepgen.00.stepspace [AXIS_0]STEPSPACE setp hm2_5i25.0.stepgen.00.position-scale [AXIS_0]STEP_SCALE setp hm2_5i25.0.stepgen.00.step_type 0 setp hm2_5i25.0.stepgen.00.control-type 1 setp hm2_5i25.0.stepgen.00.maxaccel [AXIS_0]STEPGEN_MAXACCEL setp hm2_5i25.0.stepgen.00.maxvel [AXIS_0]STEPGEN_MAXVEL # ---closedloop stepper signals--- net x-pos-cmd <= axis.0.motor-pos-cmd net x-vel-cmd <= axis.0.joint-vel-cmd net x-output => hm2_5i25.0.stepgen.00.velocity-cmd net x-pos-fb <= hm2_5i25.0.stepgen.00.position-fb net x-pos-fb => axis.0.motor-pos-fb net x-enable <= axis.0.amp-enable-out net x-enable => hm2_5i25.0.stepgen.00.enable # ---setup home / limit switch signals--- net home-x => axis.0.home-sw-in net x-neg-limit => axis.0.neg-lim-sw-in net x-pos-limit => axis.0.pos-lim-sw-in #******************* # AXIS Y #******************* setp pid.y.Pgain [AXIS_1]P setp pid.y.Igain [AXIS_1]I setp pid.y.Dgain [AXIS_1]D setp pid.y.bias [AXIS_1]BIAS setp pid.y.FF0 [AXIS_1]FF0 setp pid.y.FF1 [AXIS_1]FF1 setp pid.y.FF2 [AXIS_1]FF2 setp pid.y.deadband [AXIS_1]DEADBAND setp pid.y.maxoutput [AXIS_1]MAX_OUTPUT setp pid.y.error-previous-target true setp pid.y.maxerror .0005 net y-index-enable <=> pid.y.index-enable net y-enable => pid.y.enable net y-pos-cmd => pid.y.command net y-vel-cmd => pid.y.command-deriv net y-pos-fb => pid.y.feedback net y-output => pid.y.output # Step Gen signals/setup setp hm2_5i25.0.stepgen.01.dirsetup [AXIS_1]DIRSETUP setp hm2_5i25.0.stepgen.01.dirhold [AXIS_1]DIRHOLD setp hm2_5i25.0.stepgen.01.steplen [AXIS_1]STEPLEN setp hm2_5i25.0.stepgen.01.stepspace [AXIS_1]STEPSPACE setp hm2_5i25.0.stepgen.01.position-scale [AXIS_1]STEP_SCALE setp hm2_5i25.0.stepgen.01.step_type 0 setp hm2_5i25.0.stepgen.01.control-type 1 setp hm2_5i25.0.stepgen.01.maxaccel [AXIS_1]STEPGEN_MAXACCEL setp hm2_5i25.0.stepgen.01.maxvel [AXIS_1]STEPGEN_MAXVEL # ---closedloop stepper signals--- net y-pos-cmd <= axis.1.motor-pos-cmd net y-vel-cmd <= axis.1.joint-vel-cmd net y-output => hm2_5i25.0.stepgen.01.velocity-cmd net y-pos-fb <= hm2_5i25.0.stepgen.01.position-fb net y-pos-fb => axis.1.motor-pos-fb net y-enable <= axis.1.amp-enable-out net y-enable => hm2_5i25.0.stepgen.01.enable # ---setup home / limit switch signals--- net home-y => axis.1.home-sw-in net y-neg-limit => axis.1.neg-lim-sw-in net y-pos-limit => axis.1.pos-lim-sw-in #******************* # AXIS Z #******************* setp pid.z.Pgain [AXIS_2]P setp pid.z.Igain [AXIS_2]I setp pid.z.Dgain [AXIS_2]D setp pid.z.bias [AXIS_2]BIAS setp pid.z.FF0 [AXIS_2]FF0 setp pid.z.FF1 [AXIS_2]FF1 setp pid.z.FF2 [AXIS_2]FF2 setp pid.z.deadband [AXIS_2]DEADBAND setp pid.z.maxoutput [AXIS_2]MAX_OUTPUT setp pid.z.error-previous-target true setp pid.z.maxerror .0005 net z-index-enable <=> pid.z.index-enable net z-enable => pid.z.enable net z-pos-cmd => pid.z.command net z-vel-cmd => pid.z.command-deriv net z-pos-fb => pid.z.feedback net z-output => pid.z.output # Step Gen signals/setup setp hm2_5i25.0.stepgen.02.dirsetup [AXIS_2]DIRSETUP setp hm2_5i25.0.stepgen.02.dirhold [AXIS_2]DIRHOLD setp hm2_5i25.0.stepgen.02.steplen [AXIS_2]STEPLEN setp hm2_5i25.0.stepgen.02.stepspace [AXIS_2]STEPSPACE setp hm2_5i25.0.stepgen.02.position-scale [AXIS_2]STEP_SCALE setp hm2_5i25.0.stepgen.02.step_type 0 setp hm2_5i25.0.stepgen.02.control-type 1 setp hm2_5i25.0.stepgen.02.maxaccel [AXIS_2]STEPGEN_MAXACCEL setp hm2_5i25.0.stepgen.02.maxvel [AXIS_2]STEPGEN_MAXVEL # ---closedloop stepper signals--- net z-pos-cmd <= axis.2.motor-pos-cmd net z-vel-cmd <= axis.2.joint-vel-cmd net z-output => hm2_5i25.0.stepgen.02.velocity-cmd net z-pos-fb <= hm2_5i25.0.stepgen.02.position-fb net z-pos-fb => axis.2.motor-pos-fb net z-enable <= axis.2.amp-enable-out net z-enable => hm2_5i25.0.stepgen.02.enable # ---setup home / limit switch signals--- net home-z => axis.2.home-sw-in net z-neg-limit => axis.2.neg-lim-sw-in net z-pos-limit => axis.2.pos-lim-sw-in #******************* # SPINDLE S #******************* setp pid.s.Pgain [SPINDLE_9]P setp pid.s.Igain [SPINDLE_9]I setp pid.s.Dgain [SPINDLE_9]D setp pid.s.bias [SPINDLE_9]BIAS setp pid.s.FF0 [SPINDLE_9]FF0 setp pid.s.FF1 [SPINDLE_9]FF1 setp pid.s.FF2 [SPINDLE_9]FF2 setp pid.s.deadband [SPINDLE_9]DEADBAND setp pid.s.maxoutput [SPINDLE_9]MAX_OUTPUT setp pid.s.error-previous-target true net spindle-index-enable <=> pid.s.index-enable net spindle-enable => pid.s.enable net spindle-vel-cmd-rpm-abs => pid.s.command net spindle-vel-fb-rpm-abs => pid.s.feedback net spindle-output <= pid.s.output # ---digital potentionmeter output signals/setup--- setp hm2_5i25.0.7i76.0.0.spinout-minlim [SPINDLE_9]OUTPUT_MIN_LIMIT setp hm2_5i25.0.7i76.0.0.spinout-maxlim [SPINDLE_9]OUTPUT_MAX_LIMIT setp hm2_5i25.0.7i76.0.0.spinout-scalemax [SPINDLE_9]OUTPUT_SCALE net spindle-output => hm2_5i25.0.7i76.0.0.spinout net spindle-enable => hm2_5i25.0.7i76.0.0.spinena net spindle-ccw => hm2_5i25.0.7i76.0.0.spindir # ---Encoder feedback signals/setup--- setp hm2_5i25.0.encoder.00.counter-mode 1 setp hm2_5i25.0.encoder.00.filter 1 setp hm2_5i25.0.encoder.00.index-invert 0 setp hm2_5i25.0.encoder.00.index-mask 0 setp hm2_5i25.0.encoder.00.index-mask-invert 0 # setp hm2_5i25.0.encoder.00.scale [SPINDLE_9]ENCODER_SCALE # encoder disk only has 2 slots setp hm2_5i25.0.encoder.00.scale 2.0 net spindle-revs <= hm2_5i25.0.encoder.00.position net spindle-vel-fb-rps <= hm2_5i25.0.encoder.00.velocity net spindle-index-enable <=> hm2_5i25.0.encoder.00.index-enable # ---setup spindle control signals--- net spindle-vel-cmd-rps <= motion.spindle-speed-out-rps net spindle-vel-cmd-rps-abs <= motion.spindle-speed-out-rps-abs net spindle-vel-cmd-rpm <= motion.spindle-speed-out net spindle-vel-cmd-rpm-abs <= motion.spindle-speed-out-abs net spindle-enable <= motion.spindle-on net spindle-cw <= motion.spindle-forward net spindle-ccw <= motion.spindle-reverse net spindle-brake <= motion.spindle-brake net spindle-revs => motion.spindle-revs net spindle-at-speed => motion.spindle-at-speed net spindle-vel-fb-rps => motion.spindle-speed-in net spindle-index-enable <=> motion.spindle-index-enable # ---Setup spindle at speed signals--- net spindle-vel-cmd-rps => near.0.in1 net spindle-vel-fb-rps => near.0.in2 net spindle-at-speed <= near.0.out setp near.0.scale 1.000000 setp near.0.difference 3.333333 # Use ACTUAL spindle velocity from spindle encoder # spindle-velocity bounces around so we filter it with lowpass # spindle-velocity is signed so we use absolute component to remove sign # ACTUAL velocity is in RPS not RPM so we scale it. setp scale.spindle.gain 60 setp lowpass.spindle.gain 1.000000 net spindle-vel-fb-rps => scale.spindle.in net spindle-fb-rpm scale.spindle.out => abs.spindle.in net spindle-fb-rpm-abs abs.spindle.out => lowpass.spindle.in net spindle-fb-rpm-abs-filtered lowpass.spindle.out #****************************** # connect miscellaneous signals #****************************** # ---HALUI signals--- net joint-select-a halui.joint.0.select net x-is-homed halui.joint.0.is-homed net jog-x-pos halui.jog.0.plus net jog-x-neg halui.jog.0.minus net jog-x-analog halui.jog.0.analog net joint-select-b halui.joint.1.select net y-is-homed halui.joint.1.is-homed net jog-y-pos halui.jog.1.plus net jog-y-neg halui.jog.1.minus net jog-y-analog halui.jog.1.analog net joint-select-c halui.joint.2.select net z-is-homed halui.joint.2.is-homed net jog-z-pos halui.jog.2.plus net jog-z-neg halui.jog.2.minus net jog-z-analog halui.jog.2.analog net jog-selected-pos halui.jog.selected.plus net jog-selected-neg halui.jog.selected.minus net spindle-manual-cw halui.spindle.forward net spindle-manual-ccw halui.spindle.reverse net spindle-manual-stop halui.spindle.stop net machine-is-on halui.machine.is-on net jog-speed halui.jog-speed net MDI-mode halui.mode.is-mdi # ---coolant signals--- net coolant-mist <= iocontrol.0.coolant-mist net coolant-flood <= iocontrol.0.coolant-flood # ---probe signal--- net probe-in => motion.probe-input # ---motion control signals--- net in-position <= motion.in-position net machine-is-enabled <= motion.motion-enabled # ---digital in / out signals--- # ---estop signals--- net estop-out <= iocontrol.0.user-enable-out net estop-out => iocontrol.0.emc-enable-in # ---manual tool change signals--- loadusr -W hal_manualtoolchange net tool-change-request iocontrol.0.tool-change => hal_manualtoolchange.change net tool-change-confirmed iocontrol.0.tool-changed <= hal_manualtoolchange.changed net tool-number iocontrol.0.tool-prep-number => hal_manualtoolchange.number net tool-prepare-loopback iocontrol.0.tool-prepare => iocontrol.0.tool-prepared
# Generated by PNCconf at Tue Jan 14 11:43:52 2020 # If you make changes to this file, they will be # overwritten when you run PNCconf again [EMC] MACHINE = my_LinuxCNC_machine DEBUG = 0 [DISPLAY] DISPLAY = axis POSITION_OFFSET = MACHINE POSITION_FEEDBACK = ACTUAL MAX_FEED_OVERRIDE = 2.000000 MAX_SPINDLE_OVERRIDE = 1.000000 MIN_SPINDLE_OVERRIDE = 0.500000 INTRO_GRAPHIC = linuxcnc.gif INTRO_TIME = 5 PROGRAM_PREFIX = /home/cnc/linuxcnc/nc_files PYVCP = pyvcp-panel.xml INCREMENTS = .1in .05in .01in .005in .001in .0005in .0001in POSITION_FEEDBACK = ACTUAL DEFAULT_LINEAR_VELOCITY = 0.250000 MAX_LINEAR_VELOCITY = 1.000000 MIN_LINEAR_VELOCITY = 0.016670 DEFAULT_ANGULAR_VELOCITY = 12.000000 MAX_ANGULAR_VELOCITY = 180.000000 MIN_ANGULAR_VELOCITY = 1.666667 EDITOR = gedit GEOMETRY = xyz [FILTER] PROGRAM_EXTENSION = .png,.gif,.jpg Greyscale Depth Image PROGRAM_EXTENSION = .py Python Script png = image-to-gcode gif = image-to-gcode jpg = image-to-gcode py = python [TASK] TASK = milltask CYCLE_TIME = 0.010 [RS274NGC] PARAMETER_FILE = linuxcnc.var [EMCMOT] EMCMOT = motmod COMM_TIMEOUT = 1.0 COMM_WAIT = 0.010 SERVO_PERIOD = 1000000 [HOSTMOT2] # **** This is for info only **** # DRIVER0=hm2_pci # BOARD0=5i25 [HAL] HALUI = halui HALFILE = my_LinuxCNC_machine.hal HALFILE = custom.hal POSTGUI_HALFILE = postgui_call_list.hal SHUTDOWN = shutdown.hal [HALUI] [TRAJ] AXES = 3 COORDINATES = X Y Z LINEAR_UNITS = inch ANGULAR_UNITS = degree CYCLE_TIME = 0.010 DEFAULT_VELOCITY = 0.10 MAX_LINEAR_VELOCITY = 1.00 [EMCIO] EMCIO = io CYCLE_TIME = 0.100 TOOL_TABLE = tool.tbl TOOL_CHANGE_QUILL_UP = 1 #******************** # Axis X #******************** [AXIS_0] TYPE = LINEAR HOME = 0.0 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 1.0 MAX_ACCELERATION = 30.0 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 1.25 STEPGEN_MAXACCEL = 37.50 P = 1000.0 I = 0.0 D = 0.0 FF0 = 0.0 FF1 = 1.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 0.0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 1000.0 MIN_LIMIT = -0.001 MAX_LIMIT = 48.0 HOME_OFFSET = 0.000000 HOME_SEARCH_VEL = -0.050000 HOME_LATCH_VEL = -0.016667 HOME_FINAL_VEL = 0.000000 HOME_USE_INDEX = NO HOME_SEQUENCE = 1 #******************** # Axis Y #******************** [AXIS_1] TYPE = LINEAR HOME = 0.0 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 1.0 MAX_ACCELERATION = 30.0 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 1.25 STEPGEN_MAXACCEL = 37.50 P = 1000.0 I = 0.0 D = 0.0 FF0 = 0.0 FF1 = 1.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 0.0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 1000.0 MIN_LIMIT = -0.001 MAX_LIMIT = 48.0 HOME_OFFSET = 0.000000 HOME_SEARCH_VEL = -0.050000 HOME_LATCH_VEL = -0.016667 HOME_FINAL_VEL = 0.000000 HOME_USE_INDEX = NO HOME_SEQUENCE = 2 #******************** # Axis Z #******************** [AXIS_2] TYPE = LINEAR HOME = 0.0 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 1.0 MAX_ACCELERATION = 30.0 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 1.25 STEPGEN_MAXACCEL = 37.50 P = 1000.0 I = 0.0 D = 0.0 FF0 = 0.0 FF1 = 1.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 0.0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 1000.0 MIN_LIMIT = -24.0 MAX_LIMIT = 0.001 HOME_OFFSET = 0.000000 HOME_SEARCH_VEL = -0.050000 HOME_LATCH_VEL = -0.016667 HOME_FINAL_VEL = 0.000000 HOME_USE_INDEX = NO HOME_SEQUENCE = 0 #******************** # Spindle #******************** [SPINDLE_9] P = 0.0 I = 0.0 D = 0.0 FF0 = 1.0 FF1 = 0.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 10000.0 ENCODER_SCALE = 4.0 OUTPUT_SCALE = 20000 OUTPUT_MIN_LIMIT = 0 OUTPUT_MAX_LIMIT = 10000
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