LDC401 & LDC401A Automated Cleavers Chapter 9: Controlling the LDC401 and LDC401A
Rev B, July 19, 2017 Page 45
Coating Diameter
This parameter is used by the Insert Selection Tool to determine the optimum insert
choice for the left FHB. The coating diameter is also displayed in the Cleave Widget.
Backstop Position
Backstop Position is displayed in the Cleave Widget and provides a visual clue that
the backstop should be set and its approximate value. A value of 7mm is typically
considered to mean ‘unused’.
The following Parameters are required by the sub-critical process.
Parameter Description
Re-Tension Level
(grams)
This parameter is the additional load, in grams, applied axially to the fiber after the
Post-Scribe Pause and after successive Re-Tension Pauses. The optimal Re-
Tension Level setting is dependent upon the effective cross sectional area, material
properties and type of fiber as well as scribe size. Experimentation will be required to
optimize the Re-tension Level, but it will typically be less than 50 grams. The settings
are programmed into the Tablet Controller in grams. Possible settings correspond to
a range of tensions from 9.8 mN (0.0022 lbs) to 0.98 N (0.22 lbs).
Re-Tension Limit
This parameter is the percentage of original (starting) tension that will be added to
the original (starting) tension after the Post-scribe Pause through all the successive
re-tensioning steps.
Post-Scribe Pause
(seconds)
This parameter is the pause, in seconds, between the last blade oscillation and the
first re-tension. Typically, the Post-Scribe Pause is set to 1-3 seconds. This is enough
time for the scribe to propagate and cleave the fiber if the scribe was too large.
Re-Tension Pause
(seconds)
This parameter is the pause in seconds between each re-tension. The optimal Re-
Tension Pause is dependent upon the effective cross sectional area, material
properties and type of fiber as well as scribe size. Experimentation will be required to
optimize the Re-Tension Pause.
9.9. Parameter Limit
Minimum and maximum Parameter values permitted by the Tablet Controller are given below.
Parameter Default Min Max
Fiber Diameter
Fiber Size Dependent 10 μm 1500 μm
Cleave Tension
7
Fiber Size Dependent 1 g 6500 g
Pre-Cleave Advance
Fiber Size Dependent 200 Steps 400 Steps
FHB Offset
0 mm 0 mm 47 mm
Tension Velocity
60 Steps/s 4 Steps/s 200 Steps/s
Cleave Rotation Angle
(LDC401A Only)
0° 0° 180°
Cleave Oscillation Counter
60 10 250
Cleave Forward Steps
81 40 400
Cleave Reverse Steps
80 39 399
Scribe Delay
250 ms 1 ms 5000 ms
Set Blade Offset
Unit Specific Value 100 Steps 2500 Steps
Sub-Critical Process Parameters
Re-Tension Level (grams)
10 g 1 g 100 g
Post-Scribe Pause (seconds)
1.0 s 0.1 s 30.0 s
Re-Tension Pause
1.0 s 0.1 s 30.0 s
Re-Tension Limit
8
20% of Cleave Tension 1% of Cleave Tension 50% of Cleave Tension
7
These Cleavers are calibrated using standard weights, so the tension settings are programmed into the Tablet Controller in grams. This
corresponds to a range of tensions from 9.8 mN (0.0022 lbs) to 63.7 N (14.3 lbs).
8
These Cleavers are calibrated using standards weights so the tension settings are programmed into the Tablet Controller in grams. This
corresponds to a range of tensions from 9.8 mN (0.0022 lbs) to 0.98 N (0.22 lbs).
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