199 Subdatum Function - Working Principal - Easson ES-12 Operation Manuals

Purpose :
Most commonly available DROs in the market are just provide two set of work coordinates - ABS/INC,
however, it was found that in case of a bit more complicated machining or in the small batch
machining of repeative parts, only the ABS/INC coordinate are not adquate for providing efficient
and convenience tool positioning for the machining.
Shortfalls of having only ABS/INC coordinates are as follows
- In many machining, the work piece machining demensions are come from more than two datums,
therefore, operator have to switches between ABS and INC to set up extra machining datums times
after times, this is time consuming and easily make unnecessary mistakes.
- In case of batch machining of repeative parts, operator have to set up and calcalates all
machining positions repeatively, again, it is time consuming and not efficient !
ES-12 provides extra 199 subdatums ( sdm ) memory to overcome the above shortfalls of having only the
ABS/INC coordinates, sdm function not just simply provide 199 set of extra INC coordinates, it is specially
designed to provide very useful and convenience operations to operator for repeative batch machining.
Followings are the difference between INC and SDMs.
1. INC is independent of ABS, it won't follows any change in ABS datum ( zero point ) .
However, all sdm coordinates are relative to ABS coordinate, all sdms position are relative
to ABS's zero, it will shift together with ABS zero position changes.
2. All sdms coordinate's relative distance to ABS can be enter directly into the DRO using the
keypads. No need of any calculation or actual tool positionings inthe machine.
sdm application in the work piece that
have more than on datums
operator can store all work subdatums in
the DRO's memory as per follows
Subdatum 2
( sdm 3 )
Subdatum 3
( sdm 4 )
Subdatum 4
X
mm
Y
mm
Z
mm
SDM 2

199 Subdatum Function - working principal

( sdm 2 )
( sdm 1 )
Subdatum 1
( ABS )
work piece datum
operator than can
switches between
the subdatums directly
by press UP or DOWN
or
keys, no need to
refer back to ABS
coordinate and set
up the subdatums
from their relative
distance from ABS
sdm application in batch machining of
repeative works
since all sdm subdatums ( 0.000 ) are relative to
ABS zero, therefore, for any repeative works, the
operator just need to set up the first work piece
zero at ABS, store all the machining positions as
the subdatum zero in one of the 199 subdatum
memory.
For anymore repeative parts, just set up the 2nd,
3rd, 4th,.. etc.. work piece zero at ABS, then all the
machining positions will repears in the subdatums
zero positions.
( ABS )
work piece datum ( 0.000 )
0.000
X
mm
Y 0.000
mm
0.000
Z
mm
SDM 2
- 13 -
( sdm 3 )
( sdm 4 )
point 3
point 4
( sdm 2 )
( sdm 1 )
point 2
point 1
press UP or DOWN
keys to go to
machining points
or
move the machine
to display = 0.000,
then tool is posited
at the machining
positions.