How thin is too thin?
Material limits.
Practical guidelines.
Wall thickness limits depend on material, manufacturing process, structural needs. Going too thin causes vibration, deflection, or breakage. This guide gives practical limits.
Key principles.
0.5-0.8 mm
Practical CNC minimum 0.8 mm for aluminum. Below 0.5 mm vibrates and chatters.
0.8-1.0 mm
Steel minimum 0.8 mm. Tougher and stiffer than aluminum.
1.0-1.5 mm
Titanium springs back during cutting. Tighter limits than steel.
1.0-3.5 mm
Plastic injection: keep walls uniform 1-3.5 mm typical.
0.5-3 mm
Standard sheet 0.5-3 mm. Thinner becomes foil, thicker becomes plate.
Process specific
SLA 0.5 mm, SLS 0.8 mm, FDM 1.2 mm minimum.
FAQ
Why these limits?
Below limits: vibration during machining, deflection during use, breakage in handling. Practical reliability.
Tall thin walls vs short?
Aspect ratio matters. Height/thickness > 5: stiffness reduces; vibration increases.
Strength vs stiffness?
Min wall = strength concern. Walls thicker than min often needed for stiffness (deflection).
Process scaling?
Mass-produced parts: well-tooled, can hold tighter. Prototypes: may need slightly thicker for safety.
Material choice helps?
Higher-strength material allows thinner. 7075 thinner than 6061. PEEK thinner than nylon.
Reinforcement options?
Ribs, gussets, formed flanges add stiffness without extra wall thickness. Common DFM technique.
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