Specifications
60
The Hot-One System
D-M-E
Runnerless Molding Systems
(Insufficient resistance to ground is defined as a
reading to ground of 200.000 Ω or less.)
d. Heater resistance should be ± 10 % of listed rating.
e. The electrical resistance is calculated as follows:
R =
U
2
P
R = electrical resistance in Ω (ohm)
U = electrical tension in V (Volt)
P = electrical power in W (Watt)
3.
Manifold:
Confirm that the nozzle locations are correct. Use the
supplied manifold drawing to establish the shape of the
clearance pocket needed in the manifold retainer plate.
Nozzle Plate
Note the dowel pin locations on your
D-M-E
supplied
print and transfer this information to your nozzle plate
design.
Provide the adequate number and size water lines around
nozzle locations and under the manifold shape.
Confirm the nozzle plate thickness is as specified on the
supplied drawings.
This dimension is important because
a change in plate thickness will affect the total stack up of
the system and alter the machining dimensions of the
nozzle counterbore (C-Bore).
Note the nozzle C-Bore depth and transfer this value to
your design. The nozzle plate should be specified in
D-M-E
steel 3 or an equivalent. Provide a wire channel to pro-
tect and properly route wiring to the terminal box.
Do not run wire channels under the manifold, because
manifold temperatures may cause wire damage.
Note:
To prevent rotation during installation, key the nozzles be-
fore starting. This procedure will facilitate tip removal for
replacement or clearing of foreign material from the nozz-
le tips once the system is assembled. If the cavity contour
is machined onto an extended length sprue gate-style tip,
the nozzles have to be keyed to prevent rotation.
We also recommend that all systems incorporate the use
of wire channels to properly route, as well as protect, sys-
tem wiring.
Manifold Retainer Plate
The manifold retainer plate should encompass the entire
manifold. Provide adequate number and size water lines
around manifold pocket. The supplied drawing should be
used to establish proper clearance around the manifold.
Again, proper clearance is critical. Location of the termi-
nal mounting box must be determined. Attach the termi-
nal mounting box to the mold following the directions gi-
ven in the
D-M-E 2000
catalog, page 8d-17.
A slot (vent) should be cut from the clearance pocket loca-
ted toward the bottom side of the manifold retainer plate.
(Recommended size: 1.5 mm deep and 25 mm wide.)
The manifold retainer plate should be specified in
D-M-E
steel 3 or equivalent. Finally, if necessary, provide proper
clearance for nozzle heater leads in the underside of the
manifold retainer plate.
Top Clamp Plate
Identify locations of upper support pads on the
D-M-E
supplied print and transfer this information to your top
clamp plate design. These support pads will be mounted
to the underside of the top clamp plate. Provide adequa-
te number and size water lines over the manifold shape.
Transfer the matching machining dimension for the loca-
ting ring pocket from the supplied prints. The top clamp
plate should be specified
D-M-E
steel 1 or equivalent.
Nozzle Measurements
Follow the steps and procedure outlined on the following
pages to ensure proper system assembly.
1.
Check the head height of all nozzles being used
.
2.
Check the “A” dimension of the nozzle assemblies to
ensure this dimension is within specification and to
establish a base for all other dimensions. (
Figure
1)
(Figure 1)
3.
Counterbore Depth Measurement :
Inspect the nozzle plate that will house the nozzle bodies
for flatness. Ensure the wire channels are free of any
burrs and that all directional changes incorporate gene-
rous radii. All nozzle head counterbore depths (
Figure 2
)
are to be +0.025 to 0.000 mm from the design
dimension. Measure the counterbore in three locations to
ensure flatness.
(Figure 2)
Head height
Nozzle "A"
Nozzle plate
C-Bore
depth "B"
Guidelines for the use of a manifold block