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Configuring the PrecisionFlo Module
Evaluating Beads
In order to set Kp and Kd, dispense material and check
it to see if the bead or outlet pressure is even and
stable (Fig. 18). A properly adjusted bead has equal
segments and a smooth appearance. An even bead
may be stable (Fig. 18) or unstable (Fig. 20).
Fig. 18
Example Properly Adjusted Bead
segment 1
segment 2
segment 3
Kp affects the evenness of the bead, Kd affects the
stability of the bead. You must first adjust Kp and then
adjust Kd. Fig. 19 shows uneven beads where Kp
needs to be adjusted, Fig. 20 shows beads where Kp
has been adjusted and now Kd needs to be adjusted.
Fig. 19
segment 1
segment 2
segment 3
Example Uneven Bead Patterns
Fig. 20
Example Unstable Bead Patterns
segment 1
segment 2
segment 3
segment 1
segment 2
segment 3
NOTE: Some materials, such as compressible or
shear-thinning materials, may achieve stable perfor-
mance while bead widths in the first and third seg-
ments of the bead are unequal. If this occurs, Kp and
Kd must be adjusted together.