Manual

6-20 Beginning Programming

Dispense Gap

The Dispense Gap is the distance between the substrate you are dispensing on and the needle tip during

dispensing. This distance is one of the more common adjustments to optimize dispensing programs. The

units are in inches. Typically, the Dispense Gap is set to half the dot diameter.

Number of Shots

This parameter controls how many shots of fluid will be dispensed at a single location. When making

larger dots, it is desirable to move the needle up between shots at the same location. This parameter is set

greater than one (1) for more than one dot at the same location, and the Multi-shot Delta is the vertical

retract distance of the needle between each shot. The units are in shots. Typically, this is set to one (1)

unless you are dispensing as described above.

Multi-Shot Delta

This is the height that the Dispensing Head retracts between multiple shots at the same location. It is used

in conjunction with Number of Shots. The units are in inches. If using with Number of Shots, a typical

value is 0.010 inch.

Post Dispense Dot Parameters

Dwell Time

Dwell Time is how long the Dispensing Head stays at the final position of a move before retracting. This

gives the fluid a chance to attach to the substrate. Increasing the Dwell can reduce “stringing” of

material. The units are seconds. For most solder pastes and adhesives, 30 ms is sufficient.

Retract Distance

This is a vertical distance that the Dispensing Head moves after dispensing. The Retract Distance must be

within the Safe Z Height defined in Initial Setup. The Retract Distance can be reduced to increase

dispensing speed. However, the dot quality will be affected in viscous fluids. The units are inches.

Typically, 100 mils (0.1 in) is sufficient.

Retract Speed

This is the speed of the Dispensing Head while moving the Retract Distance. This parameter affects

when the Dispensing Head moves to the next dot. 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 squared. Typically,

300 in/sec

is sufficient.