ball screw settings

the basic setting is:
stepspermm = (motorsteps * microsteps) / pitch
assuming 8x microstepping
(200 * 8) / 5 = 320 steps per mm

then you need to calibrate HOWTO Calibrate your CNC Machine for MACH3 or GRBL or if you are using OpenbuildSCONTROL then click the 'grbl settings' tab and scroll down to the $100 - $102 settings and use the 'calc steps' buttons.

you need to calibrate because screws and never exactly the stated pitch unless you pay a kings ransom for them.

your maximum travel rate will be limited by the maximum rpm of the motors. stepper motors are limited by coil inductance and power supply voltage. higher psu voltage will give you higher speeds but of course your drivers may not handle more than you already have.

setting max travel rate is a process of try it and see. I usually set the acceleration relatively low, so it takes an inch or two to achieve max speed, then I keep doubling the max speed until it fails to move correctly, doing a relatively long movement for each setting.
commands like this will move the gantry right 400mm then left again
G0 X400
G0 X0

now go back to the previous working speed and start doubling the acceleration until it fails to move correctly, go back to the one that worked.

note that this is a balancing act, you can sacrifice some maximum speed for a higher acceleration or you can sacrifice acceleration for higher rapid rate. it depends on what you need the machine to do. lots of small movements benefit from higher acceleration, mostly long between cut movements benefit from higher top speed.

 

That moved to Wizards and Tools on the top menu couple months ago

 

correct! what I pointed out was the basic calculation, but the calibration is on the wizards page

 

Oops my bad! Though the Calculator doesnt have inputs for custom screw pitch, so probably still better to use the Calibration

 

Check your max rate settings. $110, $111 and $112
gnea/grbl