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2 seperate MPG handwheels for each axis - CNC Lathe build

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6 years 5 months ago #168058 by rodw
Replied by rodw on topic 2 seperate MPG handwheels for each axis - CNC Lathe build
swap the known good MPG to the other input and see if it will count

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6 years 5 months ago #168059 by denhen89
Replied by denhen89 on topic 2 seperate MPG handwheels for each axis - CNC Lathe build
Rodw, thanks but it seems i found the problem.
I measure Ohm on the terminals of both MPGs:
Red stick(dont know the correct word) on terminal 0V and black stick A, then B , then the A and B terminals on bottom of the mpg. All are giving 5.4 Ohm.
But, on the MPG which does not show any counts i get on all 5.4 Ohm, but not on the main "A" terminal. It shows: 0.001 Ohm
So it seems something with the terminal A on the first MPG i tested is not okay. Right now i am not sure if its because of the resistors or if i shorted something
The following user(s) said Thank You: tommylight, rodw

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6 years 5 months ago #168062 by tommylight
Replied by tommylight on topic 2 seperate MPG handwheels for each axis - CNC Lathe build
To late?
Glad it works, not glad for the faulty MPG.
2KOhm resistors can not do any damage as they were connected, must have had a 5V connected to output A at some point in it's lifetime. Anyway, i have a Mesa 7i77 and some others here, just in case.
www.youtube.com/@toma.cnc1
www.youtube.com/@toma.3d
www.youtube.com/@tomapc

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6 years 5 months ago - 6 years 5 months ago #168068 by Clive S
Replied by Clive S on topic 2 seperate MPG handwheels for each axis - CNC Lathe build
To late now put I have done a mill with a 7i96 with this code no switches
Code:
# Include your customized HAL commands here #7i96 mesa baz # change number of encoders here loadrt encoder num_chan=5 addf encoder.capture-position servo-thread addf encoder.update-counters servo-thread # MPG stuff here #### load ilowpass for mpg smoothing ### loadrt ilowpass names=ilowpass.mpgX,ilowpass.mpgY,ilowpass.mpgZ addf ilowpass.mpgX servo-thread addf ilowpass.mpgY servo-thread addf ilowpass.mpgZ servo-thread setp ilowpass.mpgX.scale 1 setp ilowpass.mpgX.gain 0.1 setp ilowpass.mpgY.scale 1 setp ilowpass.mpgY.gain 0.1 setp ilowpass.mpgZ.scale 1 setp ilowpass.mpgZ.gain 0.1 # for velocity mode (when you stop spinning the dial the axis stops) # must be set for each axis setp joint.0.jog-vel-mode 1 setp axis.x.jog-vel-mode 1 setp joint.1.jog-vel-mode 1 setp axis.y.jog-vel-mode 1 setp joint.2.jog-vel-mode 1 setp axis.z.jog-vel-mode 1 # "times 4 mode" one count per full quadrature cycle, instead of the usual one count per edge. # mpg jog wheels often have a full quadrature cycle per "click". 0 for off and 1 for on. setp encoder.0.x4-mode 0 setp encoder.1.x4-mode 0 setp encoder.2.x4-mode 0 #set axis to the required increment ( 0.01) net jog-inc-x joint.0.jog-scale axis.x.jog-scale sets jog-inc-x 0.05 net jog-inc-y joint.1.jog-scale axis.y.jog-scale sets jog-inc-y 0.01 net jog-inc-z joint.2.jog-scale axis.z.jog-scale sets jog-inc-z 0.01 #set inputs to 7i96 #encoder X net mpg-xa encoder.0.phase-A <= hm2_7i96.0.gpio.000.in net mpg-xb encoder.0.phase-B <= hm2_7i96.0.gpio.001.in #encoder Y net mpg-ya encoder.1.phase-A <= hm2_7i96.0.gpio.002.in net mpg-yb encoder.1.phase-B <= hm2_7i96.0.gpio.003.in #encoder Z net mpg-za encoder.2.phase-A <= hm2_7i96.0.gpio.004.in net mpg-zb encoder.2.phase-B <= hm2_7i96.0.gpio.005.in # send mpg-encoder counts to required axis # x encoder net enc-counts-x encoder.0.counts net enc-counts-x ilowpass.mpgX.in net enc_out-x ilowpass.mpgX.out net enc_out-x axis.x.jog-counts net enc_out-x joint.0.jog-counts setp axis.x.jog-enable true setp joint.0.jog-enable true ## The above line is to be able to jog without homing ## # Y encoder net enc-counts-y encoder.1.counts net enc-counts-y ilowpass.mpgY.in net enc_out-y ilowpass.mpgY.out net enc_out-y axis.y.jog-counts net enc_out-y joint.1.jog-counts setp axis.y.jog-enable true setp joint.1.jog-enable true # Z encoder net enc-counts-z encoder.2.counts net enc-counts-z ilowpass.mpgZ.in net enc_out-z ilowpass.mpgZ.out net enc_out-z axis.z.jog-counts net enc_out-z joint.2.jog-counts setp axis.z.jog-enable true setp joint.2.jog-enable true
Last edit: 6 years 5 months ago by Clive S.
The following user(s) said Thank You: Masiwood123

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6 years 5 months ago - 6 years 5 months ago #168069 by denhen89
Replied by denhen89 on topic 2 seperate MPG handwheels for each axis - CNC Lathe build
Some good news: I managed to move the X axis with the MPG (only DRO, without motor). The scale i choose in the GUI and it works perfectly. I just had to home both axis first and then it worked. I am happy :)

I am really very thankful to you guys that you spent your time to help me out with those problems. I appreciate that a lot. I will return the favor with some pictures and video when the Lathe is finished :P
I will order a new MPG and wait until i get it and also get the switch for the scale and some buttons. In meantime i will do the mechanical part of the lathe and as soon everything is done i will start with the wiring and configuration.
It was good to make a break as you suggested me and now i can focus on the mechanical part better :)

I am pretty sure i will need some help later with the switches and buttons, but i bought the same type of switch for the scale as Rodw used for his plasma, so i might be able to copy and paste some lines.

Again thanks and i wish you a nice rest of the Sunday!
Last edit: 6 years 5 months ago by denhen89.
The following user(s) said Thank You: tommylight, Clive S

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6 years 5 months ago #168071 by denhen89
Replied by denhen89 on topic 2 seperate MPG handwheels for each axis - CNC Lathe build
@PCW: Good to know, but then it seems i somehow put 5v on A as you wrote, or the MPG was already faulty. Who knows, but good that i had a second one and tested it without the resistors, otherwise i would be screwed :dry:

@Clive S: Thanks for that! I will need that later for sure, but i saw that you used a fixed value for the scale for each axis and you are not able to change it in the GUI, correct?
Really nice to have that HAL file, i will later test it.
I had to put a code into the custom_postgui.hal, to choose the scale from the drop down menu in the GUI. Later when the Lathe is finished, i think its good to have a physical switch on a panel where the MPG will be mounted, but also good to know that its possible to use the MPG without any switches.

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