# Hot Runner & Control Systems

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

84

The DME standard ER-Series Straight-Shot Hot Sprue Bushings (Long and Short Styles), like the standard E-Series, are supplied with a .25 inch extra stock allowance on the front face to permit machining of runner profiles or part contours into that face. These bushings feature a “reverse taper” design that originates from under the heat source, providing easier start-ups. The ER-Series design can also be used when a reverse taper will benefit a particular application. These bushings are supplied with a .12 diameter orifice and a .50 long reverse taper. The orifice may be enlarged and the taper increased to suit.

(Long Style)

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. 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. EXAMPLE: Given a setpoint of 500°F:

ER-Series (Long Style)

5.34

1.995 DIA. +.000 –.005

A = 8 7

7 TO 3

.19

8

.12 DIA.

.50

1.000 DIA.

R

.31 DIA.

.015 RELIEF

.44

.340

.015 RELIEF

.62

ENLARGED VIEW AS SUPPLIED

NOTE: For minimum projection on runner/part,

alter the bushing face (See figures 1 thru 3 on next page).

ER-Series Straight-Shot (Long Style) Hot Sprue Bushings

WITH 120 VOLT HEATER

WITH 240 VOLT HEATER

SHOULDER LENGTH A

R

ITEM NUMBER

ITEM NUMBER

SSBT4507ER1 SSBT4513ER1 SSBT4517ER1 SSBT4523ER1 SSBT4527ER1 SSBT4533ER1 SSBT4537ER1 SSBT6507ER1 SSBT6513ER1 SSBT6517ER1 SSBT6523ER1 SSBT6527ER1 SSBT6533ER1 SSBT6537ER1

SSBT4507ER2 SSBT4513ER2 SSBT4517ER2 SSBT4523ER2 SSBT4527ER2 SSBT4533ER2 SSBT4537ER2 SSBT6507ER2 SSBT6513ER2 SSBT6517ER2 SSBT6523ER2 SSBT6527ER2 SSBT6533ER2 SSBT6537ER2

7 ⁄ 8

The DME standard ER-Series Straight-Shot (Long Style) is available in seven standard shoulder lengths with either a 1 / 2 " or 3 / 4 " spherical radius and 120 or 240 volt heater. The ER-Series Straight-Shot (Long Style) can be retrofitted to suit the particular molding application. NOTE: 5° heater lead is standard. For 90° lead, add “90” to end of item number (e.g., SSBT4507ER190).

1 3 ⁄ 8 1 7 ⁄ 8 2 3 ⁄ 8 2 7 ⁄ 8 3 3 ⁄ 8 3 7 ⁄ 8

1 ⁄ 2

7 ⁄ 8

1 3 ⁄ 8 1 7 ⁄ 8 2 3 ⁄ 8 2 7 ⁄ 8 3 3 ⁄ 8 3 7 ⁄ 8

3 ⁄ 4

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

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