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I am familiar with other controls that may operate internally different than UCCNC, or at least that's how I interpret the manual.

When discussing an axes low limit vs. high limit: are there any "canned" actions or parameters that are associated with high or low pins? I didn't completely grasp the: "One negative and one positive side of limit pins can be defined." statement.

For example: can/does a low limit only register a trigger when moving in negative direction? are there any motion restrictions required to "move off" the switch? I am considering using the same pin for hi and lo on x and y with a pnp, nc series connection with mechanical switches. I do have 8 inputs available on the MX4660, but am looking for the KISS solution

Is there some doc that can be linked to that explains the trajectory planning a little more? It appears to me that "exact stop" and "constant velocity" are an OR choice with UCCNC. I am used to AND with angular and circular (centrifugal) parameters. I know terminology doesn't cross over, but just in case they would be similar to WinCNC's "autoarcfeed", "smoothing" and "constant" parameters where angular and circular direction changes are assigned parameters to determine rate of feedrate reduction, if any

Can't answer your other questions, but exact stop and constant velocity are an either or choice.

That is not to say that you cannot flip between the two, just a single line of motion can only be one or the other.

It all depends how you setup your post processor,

Limit switches basically all act the same. UCCNC will act the same regardless of which switch is tripped, so you can tie as many together on one pin as you want.
When a limit is tripped, you need to click the override limits button to be able to jog off of the switch.

There are a variety if CV settings on the General Configuration page. By adjusting the settings, you should be able to achieve what you are looking for while using CV mode. Exact stop mode would rarely be used, except for specific applications.
The manual explains them but you may have to read it about 50 times and play with it, to actually understand how some of the settings work.

Gerry...
Thanks for the info.

I got the machine frame disassembled, cleaned and moving. There are a couple mechanical things that will prevent the independent squaring, but that shouldn't be an issue on a small machine. It also looks that I will have to use the original switch configurations on the X and Y, which are on the positive (high) end of travel. I know this should work on the Z , same for X and Y, but with numbers other than zero?

There's a setting, "Write Offset on Homing". Enter the location of the switch, in machine coordinates.
Say the Switch is at X=20. When you home the X axis, it'll set the DRO to 20.000
I think that's what you're looking for?

Yes it is, thanks, Man! It was so obvious after you said it. I think I am suffering from techno term brain lock