Hot Runner & Control Systems

E-Series Straight-Shot ™ Straight-Shot Hot Sprue Bushings

83

The DME standard E-Series Straight- Shot (Short Style) is intended to suit the requirements of smaller injection molding machines and is supplied with a 7 / 8 " A dimension. The A dimension can be altered to suit the particular molding application. NOTE: 5° heater lead is standard. For 90° lead, add “90” to end of item number (e.g., SSBT4407E290).

E-Series Straight-Shot Hot Sprue Bushings (Short Style)

WITH 240 VOLT HEATER ITEM NUMBER SSBT4407E2

A DIMENSION

R

1 ⁄ 2

7 ⁄ 8

SSBT0407E2

NONE

NOTE: The expansion factor must be taken into consideration prior to machining for and installation of the bushing. This factor (BE) must then be added to the A dimension. The formula for determining this expansion factor is as follows: BE = “A” dimension x 0.00000633 x nozzle set point - 68ºF (assuming the mold is at 68ºF during operation). If mold temperature is different, substitute 68ºF with actual mold temperature. EXAMPLE: Given a setpoint of 500°F: BE = 1.375 × .0000063 × (500 – 68) = .004 thus 1.375 + .004 = 1.379. Please note that the above information is given as an example. Variations may occur based on mold configuration and cooling factor. In some instances, it may be necessary to obtain an empirical factor.

Short Style See the DME Control Systems Catalog for temperature controllers.

E-Series (Short Style)

3.22 1.995 DIA. +.000 –.005

A = 8 7

.19

.25 LAND

.015 RELIEF

.06 DIA.

.06 DIA.

1.000 DIA.

.25 DIA.

R

.25

.44

.340

ENLARGED VIEW AS SUPPLIED

SSBT4407E2

SSBT0407E2

NOTE: Must always be altered as shown in Figures 1 thru 6 (see below).

Design Guidelines for Altering E-Series Straight-Shot Hot Sprue Bushings (Long and Short Styles)

Always remove the .25 extra stock allowance and alter the A dimension to suit whenever gating into a flat part surface. Minimum stock removal of .25 provides an approximate .06 gate diameter (Figure 1).

Maximum stock removal of .268 provides an approximate .08 gate diameter (Figure 2). Maximum stock removal of .268 is recommended for gate diameters larger than .08 (Figures 3 and 4).

.268 MAX. DEPTH

.268 MAX. DEPTH

.268 MAX. DEPTH

.25 MIN. DEPTH

.12 DIA.

.09 DIA.

.08 DIA.

.06 DIA.

FIG. 1

FIG. 2

FIG. 3

FIG. 4

.268 MAX. DEPTH

.268 MAX. DEPTH

Always machine runner profile or part contour to the .268 maximum depth at centerline of gate (Figures 5 and 6). However, do not weaken the bushing face by exceeding this maximum dimension. * Resultant gate diameter may be enlarged to suit the particular molding application.

*GATE DIA.

*GATE DIA.

FIG. 5

FIG. 6

U.S. 800-626-6653 n Canada 800-387-6600 n dme.net n store.dme.net

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