Wire EDM

These are used on any shape of work piece, cutting with a wire while using the EDM process, and any straight or tapered walls going through the work piece.


These are small air passages between the parting lines of steel components that allow the gases to pass out of the mold. They are usually located at the end of fill. They have to be large enough to let the air and gas out yet small enough to retain the plastic without flashing. Vents near […]

Unscrewing Molds

Parts made from these types of tools are easily recognizable by the serrated edges of the round part. The main idea behind understanding how an unscrewing mold works is study the actual movements involved in the process of removing a closure from a bottle. When studying the motions used you will be surprised to learn […]


International indentations or slide projections in the part that do not allow for normal ejection perpendicular to the mold face.

Unbalanced Runners

In some cases the merits of a balanced runner do not add up to a cost savings. Pictured below is a runner from a mold we made for toy soldiers a long time ago. It is obvious that the runner is not even close to being geometrically balanced. The toy soldiers were attached at the […]

Two-Plate Pin Ejection System

This is one of the most commonly used ejection systems known. This is the most versatile type of system is because it is used on the all shapes of parts. While the two-plate system can be used on both the round and non-round parts, it is used more on non-round parts. Round parts will lend […]

Two-Plate Mold

The two-plate mold is the most common type of injection mold. But, why do we call it a two-plate mold when it is obviously more than two plates? The reason it is called a two plate mold is because when it is opened there are two halves. The plates on the cavity side are bolted […]

Two Component or A/B System

Silicone is composed of two parts that mix together prior to entering the mold to create a chemical reaction allowing for vulcanization to occur. These components are mixed at a constant industry standard ratio of 1:1


A force-measuring device. It has the characteristics of providing an output, usually electrical, which serves as the measurement of load, force, compression, pressure, and etcetera when placed along the sensitive axis of the force cell.

Top Clamp Plate

This is the top plate of the mold when it is in the storage position out of the press. When it is in the press this plate will rest against the stationary plate. It has clamp slots milled into it or mounting bolt holes to retain the mold in the press during opening. The top […]