Resource Library · the engineer knowledge base
46 articles across design, materials, processes, quoting and manufacturing fundamentals — built for engineers from day one to expert.
Design
3D Printing Design Guide
Layer-based design rules: orientation, supports, wall thickness, overhangs, tolerances
Applying GD&T to Machining, 3D Printing & Inspection
How tolerances map to CNC cost, CMM measurement strategy, additive manufacturing capability, and the checklist of drawing mistakes engineers actually make
CAD Preparation for Quoting
Exporting STEP correctly: units, scale, solid bodies, coordinate system and file size
CNC Machining Design Guide
Engineering rules for features, tolerances, threads, deep cavities and wall thickness
Datum Systems & Reference Frames: 3-2-1 and Beyond
How datum features build a reference frame, constrain six degrees of freedom and keep machining and inspection aligned
Design for Assembly (DFA)
Fewer parts, top-down assembly, standard fasteners — the rules that cut assembly cost
GD&T Basics for Beginners
Datums, feature control frames, MMC, and when tight tolerances actually matter
GD&T Fundamentals: Symbols, Feature Control Frames & Rules
The complete ASME Y14.5 symbol system, feature control frames, Rule #1 envelope principle and Rule #2 default RFS — the grammar of functional tolerancing
Injection Molding Design Guide
Draft, wall uniformity, ribs, shrinkage, gate/ejector marks and mold classes
Material Condition Modifiers (MMC / LMC) & Bonus Tolerance
How maximum material condition adds bonus tolerance, why bolt holes should be toleranced at MMC, and the math behind functional gauges
Sheet Metal Design Guide
Forming rules for thickness, bend radius, holes, flat patterns and tolerances
Snap Fits & Living Hinges
Cantilever and annular snap fits: strain limits, retention force and hinge design
Surface Finishes Guide
As-machined, bead blast, anodize, powder, plating, painting and polishing
Threads & Holes Design Guide
Metric vs UN threads, thread classes, blind hole depth, engagement and tap drills
Tolerances & Fits 101
ISO 286 fits, general tolerances, and how to specify mating parts that assemble
Wall Thickness & Ribs
Uniform walls, rib ratios and boss design that prevent sink, warp and failure
Materials
Aluminum Alloys Guide
Wrought alloy families, tempers and machinability of 6061, 6063, 7075, 2024 and 5052
Copper, Brass & Bronze
C110/C101, brass 360, bronze and beryllium copper: conductivity, machinability, cost
High-Performance Polymers
PEEK, PPS, PEI, PTFE, Ultem and reinforced grades for demanding duty
How to Choose a Material
A decision framework: process first, then environment, strength, cost and supply
Nylon & PA12 Guide
PA6, PA66 and PA12: hygroscopicity, wear, and SLS/MJF printed properties
Plastics 101
Thermoplastics vs thermosets, crystalline vs amorphous, and commodity engineering plastics
Steel & Stainless Guide
Carbon steels, alloy steels and stainless families: strength, machinability and corrosion
Titanium Guide
Grades 2 and 5 (Ti-6Al-4V): properties, machining, anodizing and cost
TPU & Elastomers Guide
Thermoplastic polyurethane, silicone/LSR and rubber: hardness, overmolding and printing
Process
CNC Machining: Milling vs Turning
How 3/4/5-axis milling, turning and wire EDM differ, and which to choose
EDM & Wire Cutting
Sinker and wire EDM: hardened materials, tight corners and burr-free fine features
Injection Molding Basics
How molds are built, why tooling costs, and what drives molded part price
Rapid Prototyping vs Production
When a prototype process becomes a production process, and the crossover decisions
Secondary Operations
Post-processing: deburring, blasting, coating, plating, heat treat and marking
Sheet Metal Fabrication Basics
Cutting, bending, forming, welding and stamping — and how parts are quoted flat
SLS vs SLA vs MJF
Comparing powder sintering, resin curing and multi-jet fusion for plastic parts
When to 3D Print
The decision rule: geometry complexity, quantity, and where printing beats machining or molding
Buying
CAD File Formats 101
STEP, STL, IGES, DXF, Parasolid and more — which to upload and why
Data Security & NDA
How drawings are protected: encryption, access control, NDA and IP retention
First Article Inspection (FAI)
Why the first article is measured, how AS9102 works, and what to verify
How Instant Quoting Works
How the engine prices parts: geometry, process, material, quantity and finish
How to Read a Quote
Breaking down material, processing, finishing, tooling, overhead and margin lines
Lead Times Explained
Standard vs expedited: how process, complexity and quantity set delivery
MOQ & Volume Pricing
Why minimums exist, how quantity tiers discount, and when tooling pays off
Quality Reports & Certificates
CoC, FAI, material certificates and inspection reports that ship with orders
Shipping & Duties
EXW vs DDP, freight modes, customs and what to expect at the door
Beginners
Beginner DFM Checklist
The ten-point checklist to run before you upload a part for quoting
Manufacturing Methods Overview
Subtractive, additive, formative and joining — the four families and when each wins
Part Features to Avoid
Thin walls, deep pockets, sharp corners, unsupported text — and the redesigns that fix them
What Drives Part Cost
The eight levers of part price: material, volume, tolerance, finish, quantity and more