On Mon, 6/24/13, Chris Radek <ch...@timeguy.com> wrote:

> Your real constraints are not rectangular, but you'll need to inscribe a 
> rectangle and use that.

What would be very useful is a way to "train" the system by manually moving the 
machine to its limits then clicking a button.

*Very* useful for a machine with a non-quadrilateral maximum movement envelope 
where you want to be able to use the maximum size quadrilateral space within 
the area the machine can mechanically reach.

Push it to one corner *click*, there's Home corner. Push it along the X axis, 
*click* there's the X-max - with the edge aligned with the Home corner. Push it 
back to the Home corner then along the Y axis, *click* there's the Y-max. The 
corner opposite the origin is calculated automatically - but you must ensure 
the machine can physically reach it.

Once the limits are trained, change Home to the center, a different corner, 
center of one edge, or anywhere you manually push or jog it to then set Home, 
but it doesn't forget where you set the edges.

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