WELCOME TO THE WORKBENCH INJECTOR PAGE AT NHSOUTH !

1.   ½ inch threaded steel rod   2.   temperature controller   3.   bolted angle iron frame   4.   ¾ inch thick wooden base   5.   veneer screw mold clamp   6.   0.125 inch steel nozzle   7.   4 inch dia copper tubing   8.   4 inch truck exhaust clamp   9.   pipe clamp as a guide 10.   hand-sanded steel piping 11.   hole for a 3 foot lever

The temperature controller opens and closes contacts on a big old relay, turning on and off the 120 volt AC power.   The AC power is connected to a spiral of nichrome wire.   Current causes the nichrome to reach red heat fast.   The heat is transferred to a brass pipe nipple that functions as a cylindrical melting chamber.   The thermocouple in the temperature controller almost touches the brass pipe, near the nozzle.   Most readily available thermoplastics melt in the 300-500°F range.   An aluminum block mold is screw-clamped tight against the nozzle, to receive the molten plastic, pushed in manually by a lever.         The nozzle, machined from a ¾ inch stainless steel bolt, was force-fitted and then bolted into the brass chamber.   The piston, a steel pipe nipple, was hand-sanded with emery cloth to a sliding fit.   There is a GFI receptacle on the AC line cord, for safety.   The paint used was a high temperature brown gas grill type spray paint.         By the way, the injector I built is for sale, as-is.   If you are interested, e-mail an offer.

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