Engineering decisions, organised
CNC Cost, Tolerances & Supplier Selection
Connect tolerances to a measurement plan, separate setup costs from unit costs, and evaluate suppliers against the actual part requirements.
Updated October 11, 2026 · 33 focused articles
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Follow the guide that matches the feature, failure mode or project decision you are working on.
EDM Machining Service: Wire and Sinker Capabilities, Tolerances and Cost Drivers
Wire and Sinker Capabilities, Tolerances and Cost Drivers
CNC Machined Enclosures: Design Choices That Drive Cost and Sealing
Design Choices That Drive Cost and Sealing
How Does High Volume Milling Reduce Mass Production Costs?
Read the focused guide for high volume milling reduce mass production costs.
Aerospace Machining Services: Meeting Strict ISO and AS9100 Tolerances for Safer Flight
Meeting Strict ISO and AS9100 Tolerances for Safer Flight
Aluminum CNC Machining: 6061‑T6 vs. 7075‑T6 for Better Parts and Costs
6061‑T6 vs. 7075‑T6 for Better Parts and Costs
CNC Machining Tolerances: Standard ISO 2768 Chart Explained for Real Projects (June 2026)
Standard ISO 2768 Chart Explained for Real Projects (June 2026)
Precision CNC Turning: Tolerances, Part Design and RFQ Decisions
Tolerances, Part Design and RFQ Decisions
Micron Tolerance Machining: Controlling Critical Dimensions From Prototype to Production
Controlling Critical Dimensions From Prototype to Production
Swiss Precision Turning: A Practical Path for Tight-Tolerance Turned Parts
A Practical Path for Tight-Tolerance Turned Parts
5-Axis CNC Machining: Capabilities, Costs, and When to Use It
Capabilities, Costs, and When to Use It
CNC Machining Tolerances: A Practical Guide to What You Can Expect
A Practical Guide to What You Can Expect
DFM for CNC Machining: A Checklist Before You Order
A Checklist Before You Order
CNC Machining Cost: What Drives the Price and How to Reduce It
What Drives the Price and How to Reduce It
How to Choose a CNC Machining Supplier: Vetting, Scoring, and Pilot Orders
Vetting, Scoring, and Pilot Orders
Turning Concentricity: Control Runout, Re-Chucking and Inspection
Control Runout, Re-Chucking and Inspection
When 3-Axis Milling Is Enough: Matching Machine Capability to Part Features
Matching Machine Capability to Part Features
Preparing a CAD and DFM Package for 5-Axis Quoting
Read the focused guide for preparing a cad and dfm package for 5-axis quoting.
When NOT to Use 5-Axis Machining: Cost-Benefit for Simple Parts
Cost-Benefit for Simple Parts
6061 Aluminum CNC Machining Cost Reduction: A DFM Case Study
A DFM Case Study
CNC Machining for Marine Hardware: Alloys, Corrosion Protection, and Tolerances
Alloys, Corrosion Protection, and Tolerances
Deep Hole Drilling in CNC Machining: Methods, Tolerances, and Coolant
Methods, Tolerances, and Coolant
CNC Machining PTFE (Teflon): Challenges, Tolerances, and Cutting Strategies
Challenges, Tolerances, and Cutting Strategies
Delrin vs Nylon for Machined Plastic Parts: Wear, Stability, and Tolerances
Wear, Stability, and Tolerances
Incoming Quality Inspection for Machined Parts: What to Check and How
What to Check and How
Why Machined Parts Drift Out of Tolerance: Heat, Fixturing, and Tool Wear
Heat, Fixturing, and Tool Wear
CNC Rapid Prototyping: How to Scope a First Article and Read the Quote
How to Scope a First Article and Read the Quote
CNC Machining Cost: What Actually Drives Your Unit Price
What Actually Drives Your Unit Price
CNC Turning Service: Specifying Rotational Parts Without Over-Tolerancing
Specifying Rotational Parts Without Over-Tolerancing
CNC Machining Manufacturer: A Sourcing Checklist for Vetting a Partner
A Sourcing Checklist for Vetting a Partner
CNC Machining Parts Supplier: Reading a Capability Matrix Before You Commit
Reading a Capability Matrix Before You Commit
CNC Machining Tolerances: Which Limits Earn Their Place on a Drawing
Which Limits Earn Their Place on a Drawing
Online CNC Machining Service: What Happens Between Upload and Shipment
What Happens Between Upload and Shipment
Precision Threading: From Prototype Tolerances To Repeatable Production
From Prototype Tolerances To Repeatable Production
Before you release the project
- Define the function, environment and the question this batch must answer.
- Specify material grade, geometry, quantity, finish and the dimensions that control fit.
- Agree the inspection method and the evidence required to accept the parts.
- Record the drawing revision and approval before production begins.
Common planning questions
Which CNC process should I consider first?
Start with the geometry. Rotational parts are usually candidates for turning; pockets and planar faces suggest milling. Tool access, setups and hardened features decide whether multi-axis machining or EDM adds value.
Should every dimension have a tight tolerance?
Specify tight limits only where fit or function requires them, and define how those features will be measured. Broad tight-tolerance notes can add cost without improving the part.
What should accompany the CAD model?
Provide a controlled drawing, material grade, quantity, critical dimensions, finish and inspection requirements. Identify cosmetic and sealing surfaces before the quote.
Move from guidance to a reviewed project
Send the CAD model and drawing with material, quantity, finish and inspection requirements. Use the relevant service page to review the available manufacturing route.