Owner's manual

Beginning Programming 6-29
6.6.2 During Dispense Line Parameters
Item Description
Dispense Gap
The Dispense Gap is the distance between the needle tip and the
substrate during dispensing operations. This distance is one of the more
common adjustments made to optimize dispensing programs. The units
are in inches. Typically 15-20 mils (0.015-0.020 in) is sufficient.
Speed
Speed refers to how fast the dispensing head moves during dispensing.
This parameter is actually not used for weight control lines, but basic lines
where the speed of the dispensing head affects the amount of fluid
dispensed. The units are inches/second.
Shutoff Distance
Shut-Off Distance controls where dispensing is discontinued at the end of
a move. Low viscosity fluids require that you stop dispensing prior to the
end of the move so that the fluid does not exceed the pattern limits. The
Shut-Off Distance is the point where the valve stops dispensing before the
end of the move. The units are in inches. Typically, 30 mils (0.030 in) is
sufficient.
Suckback
At the end of dispensing a line or a dot, the valve is reversed for the
Suckback period to remove any material from the tip of the needle. The
Suckback value should be set according to fluid viscosity. Typically, 10 ms
(0.010 seconds) is sufficient.
Dwell
The Dwell is how long the dispensing head stays at the final position of a
move before retracting. This allows residual fluid to detach from the needle
tip before the dispensing head moves to the next location. The units are
seconds. Typically, 0-20 ms (0.020 sec) is sufficient.
Figure 6-18 During Dispense Line Parameters