9
Heater Head and Nozzle Installation:
Changing Nozzles:
Heater nozzles are available in different sizes, end-shapes, and styles. They are generally low-mass
stainless steel shrouds with a machined top flange or hub which engages the lower heater housing. To
remove a nozzle (3), grasp the shroud and tilt the lower end of the nozzle slightly away from one of the
spring loaded clips (2), while pulling straight down. To insert a nozzle, center the theta adjustment (see
note), hold the nozzle by the shroud, insert the vacuum tip through the opening in the top of the nozzle,
place the flange of the nozzle over two of the spring clips (2) at a slight angle, and then push the nozzle
straight up until the other side of the flange snaps past the third spring clip.
CAUTION!
Nozzles may be VERY HOT! Hot nozzles can cause severe burns. Use adequate
hand protection when changing a hot nozzle, or wait for the nozzle to cool before changing.
Note: The range of theta adjustment for the heater head is limited. Attempting to force the theta
adjustment beyond its intended travel will damage the assembly. To minimize the possibility of this
occurring, observe the following: Before installing each nozzle it is best to center the theta adjustment in
its travel range and install the nozzle at the approximate rotation angle required for installation or
removal of the SMT component (usually 0, 90, or 45 degrees.)
Figure 16: Lower Heater Head
Details
The lower heater head assembly is
supported by the theta adjustment
bearings, which are mounted to the
heater plate (7). The lower heater
housing (1) rotates using the theta
adjust (8). The heat path from the
upper heater head to the lower heater
head is closed by a spring-loaded
bronze seal (4). Vacuum is generated
by a venturi in the rear head
enclosure. The vacuum tip (6), not
visible in Fig. 16, receives vacuum
through a Teflon tube connected to
the vacuum transfer pipe (5). The
vacuum tips are interchangeable for
placing and removing different size
and weight SMT components.
Interchangeable nozzles (3) are held
into the lower heater housing (1) by
three spring-loaded clips (2).
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