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17" for the mill and a little 10" jobby for the lathe. Then again I'm strapped for space.
Honestly I prefer real switches & knobs. Call me a hi-tech luddite

Simplifying things.
DIgital has 2 distinct states either 1 or 0 , using 5 volt logic as example:
5v = Logic 1
0v = Logic 0
A simple on off switch would give you these 2 values.

Anlaogue on the other hand... would have an infinite amount of voltages between 0v & 5v, ie any voltage between 0v & 5v.
A rheostat or potentiometer will give these voltages.

Turning a knob on a rheostat gives you an analogue signal. eg like a old school light dimmer, the like will go from dim to bright
Flicking a switch on & off gives you a digital signal. eg a light switch, will turn the light on or off.

Hi Aciera,
I tried (FERROR; MIN_FERROR) = (10;1) first, it runs well. I will try 1-2 days more.
After that I will test your advice of high value (100, 100). Just want to test all scenario for understanding.

Hi zz912,
I have not revised STEPGEN_MAXVEL/MAXACCEL, and not check info of drivers, just let it as default.
I will do it in next step

Thanks all of you a lot.

I am beginning to shop around for parts for my mill and I'd like a nice "big" touchscreen but no idea what constitutes big enough or too big.
As a reference, Tormach's screen is 17'', I think and it does look a tad small. I'd like to operate sliders fairly easily and not miss buttons. 
(I'll be using either ProbeBasic or QTDragon-HD, still undecided)

I was thinking to go with 24'' but maybe there's a point where you also have to move your hand too far to reach different parts of the screen? So, maybe 21.5-22'' is a happy medium?

What are you guys using?