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CNC Machining Glossary
Wall Thickness and Thin Walls in CNC Machining
Wall thickness is the local distance between the two surfaces that bound a wall. A thin wall has little stiffness relative to its height, span, material, and support. The term is not defined by one universal thickness: a short supported wall and a tall unsupported wall can behave very differently at the same thickness.
What Matters in Design and Machining
Check the complete wall geometry. Height, unsupported length, nearby openings, and connections to the base all affect how easily it bends. Material stiffness and residual stress also matter.
Avoid removing support too early. During machining, cutting forces can push the wall away and leave uneven thickness. Staged removal, suitable toolpaths, and temporary support may help. Simply reducing the feed is not a complete solution.
Details Designers and Machinists Can Overlook
Inspect the smallest remaining section. Counterbores, intersecting holes, pockets, and grooves can leave a thinner area than the nominal wall dimension suggests. Include manufacturing tolerances when checking this remaining material.
Clamped shape is not necessarily finished shape. A wall can spring back when released or change shape as material is removed. Check it in the inspection condition required by the drawing, rather than assuming that a flat clamped surface will stay flat.
Choose thickness for both manufacturing and service. A wall that survives cutting still needs to withstand assembly forces and its intended operating loads.