Owner's manual

6-28 Beginning Programming
6.6 Line Parameters
Line Parameters offer greater control over line thickness and ensure cleanly dispensed lines. Line
Parameters are divided into three categories according to when each parameter is implemented during the
dispensing process. The categories are:
• Pre-Dispense
• During Dispense
• Post Dispense
You may define up to ten different line styles in FmXP. Each style may have different parameters. You
may set line parameters for lines, weight control lines, arcs, circles, rectangles, and area fills. The
following sections define line parameter options. To edit line parameters, see 6.6.5 Editing Line
Parameters.
6.6.1 Pre-Dispense Line Parameters
Item Description
Pre-Move Delay
Factor
Some fluids have a high viscosity which means that they do not dispense
as quickly as lower viscosity fluids. The Pre-Move Delay Factor increases
the time that the dispensing head is parked with the valve ON, prior to a
programmed move. The delay at the beginning position insures that a full
line is dispensed. The units are seconds. Typically, 50 ms (0.050 sec) is
sufficient for most underfill fluids.
Down Speed
The Down Speed is how fast the dispensing head lowers to dispense. Low
viscosity fluids tend to drip and you may want to set this parameter higher.
The units are inches/second. Typically, 2 in/sec is sufficient.
Down
Acceleration
This is the parameter that controls how fast the dispensing head
accelerates to the Down Speed. The units are inches/second
2
. Typically,
300 in/sec
2
is sufficient.
Figure 6-17 Pre-Dispense Line Parameters