> A -- The tool is dull and we need to move to a new position and replace the
> tool with a sharp one. In that case, we might want to also touch off the
> new tool to measure it's length and also change the tool length in a tool
> table.
B -- You are cutting a stringy material such as plastic and need to stop 
and clear the cutter. I have this problem quite often.


Being able to jog while paused is a very useful function and I would 
really like to see it but it needs a fair amount of work and unless 
someone steps up to the plate it isn't going to happen. However allowing 
jog while in MDI mode is a relatively simple change. It also isn't that 
difficult to implement an option to jog while changing tools. A few 
years back I hacked the tool change code to allow this. It basically 
made a note of the current line number then stopped the interpreter to 
allow jogging. After the tool change it did a 'run from here' to 
continue. Not an ideal solution but it worked in most cases.

> A jog dial (MPG) works in MDI.  The keyboard keys <-  ->
> (and up and down arrows to select lines to recall) are used
> in the Axis screen to move around in the text entry window
> when in MDI mode.

That is interesting. Maybe I need to update from my old copy of EMC to 
LinuxCNC. At least it proves there is no technical reason why you can't 
jog in MDI mode. Mach handles the jog key issue in a very simple way. If 
the MDI box has the focus the arrow keys etc are used for editing. If 
any other control has focus, jog keys jog. It is pretty easy to 
implement and works well.

Les


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