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Uniform Wall Thickness

Where feasible, walls should be of uniform thickness throughout.Variations in thickness lead to distortion, internal stresses, voids, cracking, and sink marks. In addition, they cause non-uniform shrinkage, interfering with dimensional and tolerance control. Thicknesses in the range 1.3–6.3 mm (0.05–0.25 in.) are preferred, but exceptions in both directions are possible.

Figure 1 shows several common ways to modify a form to achieve more uniform wall thicknesses. Removing material to create uniformity in wall thickness offers the added advantage of saving material; given the high cost of the very fine metal powders used in MIM, this can be a significant economic benefit.