Key principles.
60% wall
Rib 60% of base wall. Prevents sink marks at rib base.
3× wall max
Rib height ≤ 3× wall thickness. Above this, draft and shrinkage issues.
0.5° per side
Standard 0.5° draft per side. Allows ejection from mold.
0.25× wall
Generous fillet at rib base reduces stress concentration.
3× wall
Rib center-to-center 3× wall thickness minimum.
Significant
Rib pattern stiffness 2-5× plain plate. Without weight or sink marks.
FAQ
Add stiffness without thick walls. Thick walls cause sink marks. Ribs solve this.
Cross ribs (X pattern) gives 2-3× stiffness vs parallel. Choose per loading direction.
Center-to-center 3-5× wall thickness. Tighter spacing = stiffer but more material.
Rib thickness 60% of wall = critical rule. Going thicker causes sink. Fillet base helps.
Sufficient draft (0.5° each side) and fillets. Rib must release cleanly from mold.
Cross-rib + edge stiffening + thickness optimization for max stiffness per material.
Get an instant quote
Send your CAD — we reply with detailed pricing, lead time, and DFM feedback within 4 working hours.
Talk to an engineer
WhatsApp our team directly. Most messages answered within 12 minutes during work hours.
Explore all services
CNC, 3D printing, injection molding, sheet metal, casting, finishing — one quality system, one partner.
Working on a live project? Send the STEP file and the two or three features you are unsure about — an engineer replies with DFM notes and a price, usually within four working hours.