Magnescale LH71A - Reference Point Mode; (How to Use the Measuring Unit with a Reference Point)

(E) 7-15
7. Operation Method
LH71A / LH72
7-2-9. Reference Point Mode
(How to Use the Measuring Unit with a Reference Point)
Can be combined with a measuring unit with a reference point.
When you use a reference point, you can relocate the machining datum point to the same position. If the tape
moved, for example, when the system power supply was off, it is possible to relocate the machining datum
point in its initial position.
Set the reference point offset using reference point position detection or by inputting an offset value.
∗ The reference point offset is the distance (L) from the reference point of the measuring unit to the ma-
chining datum point.
∗ The reference point is also used as the datum when setting segmented error compensation. Regarding the
use of a reference point when setting segmented error compensation, see “5-5-2. Segmented Error
Compensation”.
L
L
Milling Machine Lathe
L
L
Milling Machine Lathe
Workpiece
Cutting tool
Measuring unit reference
point (absolute reference
point)
Machining
datum point
Measuring length
indicator mark
(on both sides)
Reference
point mark
Pick-up head
Measuring unit with a
reference point
Machine table
Measuring unit with a
reference point
Pick-up head
Measuring length
indicator mark
(on both sides)
Reference
point mark
Measuring unit reference
point (absolute reference
point)
Machining
datum
point
Machine table
Workpiece
Movement
Cutting tool
<Setting/storing a reference point offset (reference point hold)>
Set/store the reference point offset (L). When the reference point position is detected, the count is held.
By storing this value, the machining datum position is relocated.
Set the datum point in advance.
Display
1 Press the key. ( lamp lights up)
↓
2 Press the key corresponding to the axis to be put into a
reference point hold status, and then press the key.
A reference point wait status is activated. (Current value flashes)
Workpiece
Across reference
point
Measuring unit
reference point
Machining
datum point
Measuring unit
reference point
Machining
datum point
(Current value
(ABS))
(Flashes)
Across
reference
point