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Milling Functions
The EM250 DRO has a number of functions to assist in Milling operations. These functions
are described in more detail in this section.
Work-to-Zero
Before we start looking at the functions in depth it is worth noting that the EM250 DRO, like all DRO operates on a
principle, within functions, known as Work-to-Zero. Normally you may expect to zero an axis display and move to a
number of your choosing, and for simple operations this is OK. However, as tasks get more complicated it is easier
for the DRO to display the distance the tool is currently away from the desired position. Thus when you move to a
position that is 0, 0 then you will have reached that desired location.
Sub-datums (SDM)
Sub-datums allow for workpiece reference positions to be defined that can
then in turn be used as the start/centre co-ordinates for other functions,
such as PCD, ARC contouring etc. These are especially useful when
producing batches of components that are to be all the same. In this
manner, once the workpiece ABS datum has been established, the sub-
datums will automatically be set as they are relative to the ABS datum,
wherever that may be.
SDM's can either be Taught or entered directly:
To best demonstrate these methods let us consider the part below. This has 4-SDM positions defined about a
central ABS point.
X+
Y+
Define a SDM pattern: (Teach method)
ABS
.
Enter ABS mode, move to desired workpiece datum and set this as the datum by zeroing the axes.
Select SDM #1, move to desired point.
.
SDM MODE
.
- 17 -
#SDM Co-ordinates
1
50, 35
2
50, -50
3
-50, -50
4
-50, -35
.
ABS
.
.
SDM MODE
.
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