Instruction Manual

Beginning Programming 8-7
Backtrack Length
This is the horizontal distance that the dispensing head moves back over the dispensed line after raising
up the Backtrack Gap distance. This encourages congealed fluids to detach and distributes any excess
fluid back across the line. The units are inches. Typically, 30 - 40 mils (0.030 - 0.040 in) is sufficient.
Backtrack Speed
This is the speed that the dispensing head travels when moving along the Backtrack Length. The units are
inches/second. Typically, 2 in/sec is sufficient.
Retract Distance
This is a vertical distance that the dispensing head moves after the Backtrack Gap and Backtrack Length
dispensing commands have completed. Figure 8-2 shows the relationship between Retract Distance,
Backtrack Gap and Backtrack Length. The Retract Distance must be within the Safe-Z Height defined in
Initial Setup. The units are inches. Typically, 250 mils (0.250 inches) is sufficient.
Retract Speed
This is the speed of the dispensing head while moving the Retract Distance. The units are in
inches/second. Typically, 2 in/sec is sufficient.
Retract Acceleration
This is the parameter that controls how fast the dispensing head comes up to the Retract Speed. You may
need to set this high for small dispensing moves. The units are inches/second
2
. Typically, 300 in/sec
2
is
sufficient.
Item Description
1 Retract Distance
2 Backtrack Length
3Backtrack Gap
Figure 8-2
3. Click on OK to close the Line Parameters dialog box and return to the Programming
Window.
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