Hi Jon,
> From: Jon Elson [mailto:el...@pico-systems.com]
> Hello,
> 
> I have a gadget I put together for a project at work, beagle
> bone and Machinekit.
> It is a one-axis linear positioner.  I only need to move to
> the correct positions for
> 4 samples.  So, the G-code is something like :
> 
> G1 F25 X1
> 
> Where the number after the X will be 0,1,2,or 3.
> 
> I already have a pyvcp on it.  I'd like to add buttons
> marked 1, 2, 3 and 4, and when the user clicks
> one, the G-code is fed to the interpreter and run.  I know
> people have discussed doing things
> like this before, but I'm a little vague on how to do it.
> 

I've done something like that although I ran into issues at some point.  
Haven't gotten back to it so I don't remember the problems I ran into.

However this page I think shows how you create the G code command as a MDI 
command.
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Adding_Custom_MDI_Buttons

You'd just need 4 buttons and four MDI_COMMAND0, MDI_COMMAND1, MDI_COMMAND2 and 
MDI_COMMAND3.  You can try that all on your own mill before you even get to the 
beagle.

John Dammeyer




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