Lathe dual MPG wheels who's done them ?

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09 Jun 2021 01:54 - 09 Jun 2021 10:32 #211578 by my1987toyota
So I am finally getting back to my Lathe project and I want to do dual MPG wheels so if I need to do manual work
I can. My problem is when I look down the GPIO selection tables in PNCConf. there are no selections for MPG encoders
I know I am missing something simple here and I am hoping someone has done this before so I can be pointed in the right direction

What am I doing wrong?
Last edit: 09 Jun 2021 10:32 by my1987toyota.

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09 Jun 2021 02:38 #211581 by PCW
On the I/O connector 1 tab, if you select "7I76 Mode 2 I/O Card",
the two MPG encoders will show up on the appropriate field
input pins.
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09 Jun 2021 04:50 #211587 by cmorley
Also on the 'External Controls' page select 'External MPG Jogging'.
Adjust those choices to set up the HAL code.
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09 Jun 2021 09:35 #211602 by andypugh
My lathe has 5 x MPGs.
X and Z are mounted on the carriage
Feed override and Spindle Override on the control console
Then there is a 16-click + pushbutton one on the apron that puts the lathe in manual mode and selects the jog increment.
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09 Jun 2021 09:49 - 09 Jun 2021 09:49 #211604 by rodw
If you search for Spaceship Plasma, there is a full worked example on about page 3 or 4 for mesa 7i76e
forum.linuxcnc.org/show-your-stuff/32029...utter-build?start=20
Last edit: 09 Jun 2021 09:49 by rodw.
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09 Jun 2021 10:27 #211608 by my1987toyota
WOW, more information then I could ask for . Thanks PCW, cmorley, andypugh, and rodw. After work I will dive right in.
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12 Jun 2021 02:47 #211843 by my1987toyota
well I am definitely getting closer I found the spot PCW was talking about and made the appropriate
selections . I still have some work to do . Do I need to wire in an overide switch to tell Linuxcnc
that I wish to use the encoders to move the axis ?

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12 Jun 2021 04:00 #211852 by BeagleBrainz
Just change to manual mode on the Linuxcnc screen. (Same as if you were using a MPG on your mill)

Yes a switch could be used, but make sure it's not in an area were you could press it without meaning to. Cause none of us would press a button without meaning to :lol:
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13 Jun 2021 14:16 - 13 Jun 2021 14:56 #211938 by my1987toyota
major facepalm.
I found my last issue. One I have to have the machine homed before the MPG Jog Wheels will move an axis.
the last thing though is in Pncconf. The "External Controls" page I had to change the "Default" setting from 0.0000 to 0.0010
Now it works . I will do a video at some point on setting up simple dual MPG Jog Wheels .
Talk about a " cant see the trees through the forest" type scenario.

Thanks to everyone for their help . I hope this will at some point help someone else setting up Linuxcnc and the 7i76e for the
first time.

Ironically I have the " Default " again set to 0.0000 and a selector switch set to either off, A= 0.0010, or B= 0.0001.
Last edit: 13 Jun 2021 14:56 by my1987toyota. Reason: adding information

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13 Jun 2021 17:58 #211955 by BeagleBrainz
You need to connect to the joint pins to be able to jog before homing.
I think that was one of the big changes between 2.7 & 2.8
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