Injection moulding typically produces parts with tolerances of +/- 0.25mm. Tighter tolerances can be possible in certain situations but increase the cost of manufacture dramatically.

Draft angle is a taper applied to the vertical walls of the component to be moulded to assist with releasing the part. Walls without draft angle may become stuck in the mould and will have drag marks on their surface.

When designing ribs, use a thickness equal to 0.5 x the main thickness, define a height smaller than 3 x the rib thickness and use a base fillet with a radius greater than 1/4 x the rib thickness. Also make sure to add draft angle!

Commercially, injection moulding offers a flexible, consistent and cost-effective process of manufacturing that allows for rapid production of parts in a range of materials. Once the process has been set up and tested, machines can produce thousands of items per hour and once the mould is created (which is the most expensive element) the cost of production per component is relatively low.

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Undercuts refer to part features that cannot be manufactured with a simple 2-part mould because material is in the way while the mould opens or during the ejection of the part. Avoiding undercuts all together is usually the best options as they add cost, complexity and maintenance requirements to the mould.

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When adding text choose embossed text over engraved text as it is more economical when creating the mould. Raising the text 0.5mm above the part surface will ensure the letters are easy to read.

Redesigning the part to remove undercuts or moving the part line can be possible solutions to make the design more feasible.

Here at UNSW we have 2 CR Clarke desktop injection moulders great for learning, testing and experimenting with the process!

When 2 flows meet, small hair-like discolorations may develop. These knit lines affect the parts aesthetics, but also they generally decrease the strength of the part.

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For interior edges, use a radius of at least 0.5 x the wall thickness. For exterior edges add a radius equal to the interior radius plus the wall thickness to ensure constant thickness everywhere. This can also help to stop stress concentrating in the sharp corners which can cause weaker parts.

To avoid warping and sink marks on the part as the melted material cools down it is important to have uniform wall thicknesses and avoid thick sections if possible.

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Thick sections can lead to various issues such as warping and sinking. Reducing the maximum thickness of the design can be achieved by making the thicker sections hollow is essential. To improve the strength of these sections, ribs can be used to create structures that are of equal strength and stiffness but with reduced wall thickness and weight.

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The uniform wall thickness limitations also applies to edges and corners; the transition must be as smooth as possible to ensure good material flow through the mould.

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When certain sections cool (and as a result shrink) faster than others, then the part can permanently bend due to internal stresses.

Injection moulding is a manufacturing process that melts, injects and sets plastic into a metal mould. The plastics used by injection molding processes are relatively cheap and can be used to achieve a wide variety of properties, so injection molding is popular for creating many packaging and consumer products, like LEGO!

As the plastic shrinks, it applies pressure on the mold. During ejection, the walls of the part will slide and scrape against the mold, which can result to drag marks.

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