Re: Absolute Encoders

Anthony <tonytn36sp@xxxxxxxxxxx> wrote in
news:Xns97F1E1E50876Eacziparle3sp835@xxxxxxxxxxxxx:

D Murphy <spamto154@xxxxxxxxxxx> wrote in
news:Xns97F1D2F644732BW12BU20MU38SY@xxxxxxxxxxx:



Hmph. Our machines have Fanuc controls and they do have a key for
zero return. It's probably another one of those things that is left
up to the builder and most will take the path of least resistance and
not provide that function. But there is a procedure that goes along
with the ZRN.


Ya, possibly. On ours there is a procedure whereby you have to set
the axis bit in 1815, power down, power up....physically set the axis,
reset the bit in 1815, power down, power up.....etc etc etc
Whole lot more trouble than hitting the 'preset' button, typing in the
physical position, 'enter' 'ref key' "Axis + key" done. (on some of
the older controls, it's just 'preset' 'value' 'enter' done.


We call that "forcing the bit". It works on our machines too but it's a
PITA. You need to be able to force the axis to zero though if you say
replace a ball screw or a servo motor. In those cases the factory set zero
position is likely not valid anymore.

--

Dan

Scopulus est usquequaque nefas
.

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