ISO 20457 gives the general tolerances for plastic molded parts. Plastics shrink and warp, so molded parts need much wider tolerances than machined parts. The standard sorts them into tolerance groups TG1 to TG9, and a drawing names one group as the general tolerance, for example General tolerances ISO 20457 – TG6. Use the tables
ISO 286 is the international system of limits and fits for holes and shafts. Use the tables below to pick a fit such as H7/g6 or H7/p6, read the limit deviations for your size, and check the resulting clearance or interference. The values apply to parts made by CNC machining, rapid prototyping and low-volume manufacturing.
CNC Machining Design Guidelines 11 Practical Rules to Cut Cost and Lead Time A part can look perfect in CAD and still be slow, expensive or risky to machine. These are the design rules our engineers recommend most often, and each one is cheap to apply before production starts. CNC machines remove material with rotating
Two mold quotes for the same plastic part can arrive with very different prices, and the first instinct is to assume one supplier is overcharging. Often the real reason is simpler: they are quoting different molds. One may be pricing a hardened-steel tool built for a million shots. The other may be pricing a pre-hardened
T0 The mold’s health check Does the mold work mechanically? Look at: mold function, water lines, cavity fill. Not part dimensions. T1 First trial, first real samples What problems does the design still have? Look at: samples, trial report, dimensional report. T2 Fix and verify Did the fixes work? Is the process stable? Look at:
Surface Profile Comparison — microscopic cross-section view Ra values in µm Ra 3.2 µmDefault Ra 1.6 µmPrecision Ra 0.8 µmHigh-precision Ra 0.4 µmUltra-precision What Is Surface Roughness? Surface roughness describes the microscopic peaks and valleys left on a machined surface as a result of the cutting process. Even a surface that looks perfectly smooth to the naked
Overmolding is one of the most powerful techniques in modern injection molding — allowing engineers to combine multiple materials into a single, high-performance component without adhesives, fasteners, or secondary assembly. From the soft-touch grips on surgical instruments to the waterproof seals of consumer electronics, overmolding is quietly behind some of the most functional and elegant
— Medical Device · Rapid Prototyping 50 Units. 20 Days.Zero Compromises. How RpProto delivered a complete laser hair removal device prototype run for a European medical aesthetics company — on time, across four materials and six manufacturing processes. 50 Complete Assemblies 20 Days to Delivery 4 Materials Used 6 Manufacturing Processes Project Overview An International
Option 01 SLA Stereolithography Surface quality Excellent Mech. strength Low Lead time 1–3 days Accuracy (±mm) 0.10 Best for 1–10 pcs Option 02 SLS Selective Laser Sintering Surface quality Rough Mech. strength High Lead time 3–5 days Accuracy (±mm) 0.20–0.30 Best for 1–30 pcs Option 03 Vacuum Casting Urethane / PU Casting Surface quality Excellent
The plastic injection molding gate directly affects polymer flow behavior, part quality, and process efficiency. It connects the runner system and the cavity. The gate regulates melt flow rate, shear conditions, and pressure distribution during filling. Its geometry and placement not only determine how the cavity is filled but also influence weld line formation, shrinkage,
