User`s guide

Backtrack Length
This is the horizontal distance 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 in inches or millimeters. Typically, 30 - 40 mils (0.030 - 0.040 in) is
sufficient.
Backtrack length can be negative. This will force the movement of the tip to move
forward in the same direction as the line, instead of backwards over the line. This can
useful when dispensing a closed path, such as a square or circle.
Backtrack Speed
This is the speed the dispensing head travels at when moving along the Backtrack Length. The units are either in
inches/second or mm/second. Typically, 2 in/sec or 50.8mm/sec is sufficient.
Retract Speed
This is the speed of the dispensing head while moving the Retract Distance. The units are in either inches/second or
mm/second. Typically, 2 in/sec or 50.8mm/sec is sufficient.
Retract Distance
This is a vertical distance that the dispensing head moves after the Backtrack Gap and Backtrack Length dispensing
commands are completed. The figure below shows the relationship between Retract Distance, Backtrack Gap and Backtrack
Length.
The Retract Distance must be set high enough so the machine can move safely to the next point without hitting any
obstruction on the work piece.
The units are in either inches or millimeters. Typically, 30 mils (0.030 in or 0.762mm) is sufficient.
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Sales and service of Nordson EFD dispensing systems are available worldwide.
EFD
®
TT User's Guide
Version 1.2