1- I'm a beginner in Mach3. I'm using an old mechanics of a photoscope to make a new CNC plasma cutting machine.
I implemented a torch height control with a dc motoreductor, so I don't need to control a 3rd step motor for it, except for some signals.

I'm up to begin to use it and have to define how to home both axis.

I have rode the forum and found several posts about homing but I don´t know in a simple manner how to home the system because there are aparently many ways to do it:

*Macropump
*Get OEMLed
*Dobutton 23, 24
*G24
*G28
*while ismoving()
So I'm confused about what I have to do to home the equipment, two axis.
I have now two microswitches wich I'd like to use for simplicity but if necessary I have in a drawer some optical sensors that I would have to complement with a little circuitry to get more precision.   The thing is that I'd like to begin asap and then make some improvements.   

What would you think is a simple, fast but not bad solution for homing?

2- I have tryed to set the homing limits in the screen to it of Mach3 and it puts automatically negative quantities, Is there a way to avoid it?  Because if the Gcode comes all with positive coords, the usable area would be restricted to 1st quadrant.

Thank you very much for your assistance.
Luis J

Assign your switches to the Home inputs in Config > Ports and Pins > Input Pins.

Press the Ref All button.

That's it.

Thank you very much.  It is really simple!

But why so many people are making macros for homing?
What is that of "macropump"? What is the difference with a simple macro?

The screen to set the table and soft limits, puts negative values, What can I do?

L J

But why so many people are making macros for homing?

good question but you'd have to ask them

TBH unless you're doing HD plasma, precision and plasma don't really happen in the same sentence.

I'd throw the sheet on the table, kick it kinda close (got some steelies?), set a zero by eye and cut. Life's too short to be homing plasma.