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PCD (Pitch Circle Diameter) / Bolt-Hole
The EM250 PCD calculator operates on the work-to-zero principle for the machining of a regular series of holes
around a datum. This datum is entered as the centre of the circle to be machined. Complex hole patterns can be
achieved easily without the need of detailed trigonometric calculations as these are all performed by the DRO.
To achieve these calculations the DRO needs to be configured with the following parameters:
● Centre of the circle
● Diameter of the circle
● Number of holes required
● Start angle of the first hole
● End angle of the last hole
To best demonstrate these methods let us consider the part below as by way of example.
Enter the PCD function by pressing the
Enter the co-ordinates of the centre of the PCD circle.
Move to Diameter entry and enter value.
Use the Message
Navigation keys
Angles are positive clockwise
1
key. The key LED will be illuminated showing the function is active.
.
ABS
.
CENTRE
.
.
DIA
.
X+
Y+
+
Parameter
Centre co-ordinates 0.000, 0.000
Diameter
Number of Holes
Start Angle
End Angle
- 21 -
Value
80mm
5
30o
300o
If a full circle is needed:
●
Start Angle = 0o
●
End Angle = 360o
.
CENTRE
.
CENTRE
.
.
DIA
.
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