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There are many cases where engineers avoid designing a component part using thermoplastic resins as the material of choice because the cost of machinery and tooling is perceived to be prohibitive. This is not the case when using a "Wasp" Mini-Jector and low cost "V" molds. All that is required to operate a "Wasp" Mini-Jector is an air compressor of at least 2 HP and 11SV household outlet for the pneumatic model #45, or 230V single phase current alone for the hydraulic self contained models #50 and #55. The latter current source is the same as used on your home range or dryer.

Typically, a "V" mold with sprues runners and cavities (and including the standard "V" mold bases available from Mini-Jector) may cost less than a complex commercial small mold base alone without any cavities! A "Wasp" machine and its "V" mold can be producing parts before big machine tool- ing is off the drawing board.

Because of the low cost of Mini-Jector machines and tooling, even very short produc- tion runs of 100 pieces or less can be economi- cally possible. A typical case in point would be a model shop, where miniature scale models of industrial equipment and hardware are assem- bled in precision scale models of factories and manufacturing facilities. A large variety of parts in small individual quantities are required in such an undertaking. Prototyping of new or experimental parts, color testing, ASTM tensile test specimens, and educational programs in schools and universities are other typical appli- cations for "Wasp" Mini-Jectors.

Insert and loose-core molding can be per-economically on "Wasp" Mini-Jectors. Insert molding involves molding plastic around a metal or wire inserted object or onto a previ- ously molded plastic article (sometimes called "overmolding") to form a finished assembly. Complete encapsulation of miniature electrical or medical devices can be performed on these machines. Loose cores are metal forms inserted into the mold prior to molding to form hollow portions in the finished part. The core is then removed from the mold and finished piece after the mold is taken apart. An example of loose core molding would be forming the hollow portion of a fishing lure.

Insert molding of electrical parts such as sockets, cord sets, and slip ring and brush assem- blies would be typical insert applications, as would molding handles on tools or knife blades. The beauty of insert molding using "V" molds is that the insert or loose core can be placed in the mold; the two halves assembled and the entire assembly held in one's hand prior to placing it in the machine. This permits molding around very fragile inserts that could not be safely molded in high tonnage machines. The illustrations on the back of this bulletin show very simple insert and loose core molding examples.

The Mini-Jector Machinery Corp. has also produced a number of special variations of our standard machinery line that do not appear in our brochures. If you have a unique application, please call us. We may have already successfully solved that problem for someone else.