hy alymer i have a little experience with y turrets on p300, not 5000; here are a few tips :
... in many cases, alignment position is at Y<>0; is not possible to go in parameters, select X, and declare X0, simply because Y<>0
... there is a way arround this :
...... let's suppose that your alignment is at Y0.5 : disable Y axis( turret will move ), go to parameters and shift Y origin with ±0.5, then reactivate Y axis ( turret should come back to where it was before ), then disable Y axis ( turret won't move ) (check later *1 below)
...... at this moment, theoretically, is should be like the turret did not move at all : go to parameters, and declare X origin 0
let's consider that you use a centro for this alignment :
... enabling & disabling Y axis, shifts the motor from "brake state" to "active state", and this may induce a centro deviation of a few hundreds
... if you are not satisfied with results after your 1st try, you should repeat all above steps, until you will be satisfied with what you see on the centro; normally, after each repetition, the deviation displayed by the centro should lower, but in reality, after a certain value, it will start to go up and down ( arround a "medium value" ), because Y axis motor shifts it's state, and also because of backlash ( 0.04 ... 0.03 should be enough; going for <0.01 will take you much more time, and won't be relevant )
... my advice : if you are centering for :
...... turning, always do your last check with Y axis disabled
...... milling, always do your last check with Y axis enabled
(*1) more precise, turret may move, because Y axis will shift from " active " to " break ", and because of backlash; movement shoud be small (like <0.03eq, and also it won't be consistent ) ... so, if you will try to align your lathe at a precision <0.03eq, then you have to decide if you do it for Yon or Yoff
in other words, aligning an Y lathe is a bit more tricky, because there is "noise" ( or "variables" ) caused by the enabling/disabling Y axis, and backlash of X&Y
"noise" also exist on nonY lathes, but is smaller, thus is possible to achieve a better alignment on an nonY lathe; this may sound irelevant, but, if you have aligned many nonY lathes, and suddenly you have to align an Ylathe, you may reach a situation where your centro may start to "float"
so, with Y lathes, is ok to be more tolerant, don't squeeze your centro for perfection
always align at a value >= " noise ", and be aware that more axis will induce more " noise "
i hope you found this usefull