During the daily machining process, it is very common that the machining cannot
be completed within one working shift, and hence the DRO has to be switched
off, or less commonly, a power failure occurs whilst machining which leads to
loss of the work piece datum ( work piece zero position ). The re-establishment
of work piece datum using edge finder or other method inevitably introduces
machining inaccuracies, because it is not possible to re-establish the work piece
datum exactly at the previous position.
To allow the recovery of work piece datum very accurately, with no need to
re-establish the work piece datum using an edge finder or other methods, every
transducer has a reference point location to provide a datum point memory function.
The working principal of the ref datum memory function is as follows.
-
There are a permanent and fixed mark (position) on the transducer,
normally called
mark or
point..
Since this
point position is permanent and fixed, it will never change or
disappear when the DRO system is switched off. Therefore, we simply need to
store the distance between the
point and the work piece datum ( zero
position ) in DRO's memory. Then, in case of the power failure or the ES-2 being
switched off, we can recover the work piece datum ( zero position ) by presetting
the display zero position as the stored distance from the
point.
ref
ref
ref
ref
ref
to store the X axis work datum
- 9 -
ref
datum memory function
function :
Example :
ES-3
ES-3
ES-3
ES-3
ES-3
RECALL 0
provides one of the most easy-to-use
datum memory function.
There is no need to store the relative distance between the
mark and your work datum
zero into the
,
In daily operation, operator simply needs to locate the
mark position whenever they switch on
the
to let it know where the
mark position is, then
will automatically do the work
datum storage on its' own . In the case of a power failure or the
being switched off, the
operator can recover the work piece datum easily by using the
procedure.
ref
ref
ref
ref
ref
whenever you alter the zero position of
coordinate, such as by zeroing,
centre find, coordinate preset or etc..,
will automatically store the relative distance
between
zero and the
mark location into
's memory.
ABS
ES-3
ABS
ES-3
Operation :
Distance between the
ref point and work piece datum
X axis
mark position
( permanent and fixed )
ref
work piece datum
( zero position )
After power failure, the work
piece datum (zero position) can
be recovered by presetting this distance
from the
mark position.
ref
glass grating scale
Easson
Easson
