Tolerance Stack-Up in Machining: Why Setups Decide Accuracy
Axis count does not make a machining center more accurate on any single feature. What it changes is how many times the part is unclamped and put back, and every one of those moves adds a term to the tolerance stack-up. That is the whole reason 3-axis and 5-axis milling produce different results on tight-tolerance […]
CNC Machining Cost Per Part: A Price Breakdown
CNC machining cost per part is the sum of six line items: material, setup and programming, machine time, tooling and consumables, secondary finishing, and inspection and documentation. Freight and duty then sit on top as landed cost. This article breaks down each of those lines — what it pays for, how it behaves as quantity […]
How to Request a CNC Machining Quote: RFQ Checklist
A CNC machining quote is only as good as the data package it is priced from. When an RFQ arrives with a solid model but no dimensioned drawing, or with “aluminum” instead of a grade and temper, the estimator assumes the expensive case, because that is the assumption that does not lose money. This checklist […]
CNC Machining Lead Times: Prototype Vs Production Comparison
A CNC machining lead time is the elapsed time from a released drawing to finished parts, and it is made of the same phases whether you order one part or ten thousand: quoting, programming and fixturing, material, machining, finishing, and inspection. What changes in prototype vs production lead time is which of those phases dominates. […]
How to Choose the Right CNC Machining Supplier in China
Choosing a CNC machining supplier in China comes down to four verifiable things: whether the company owns the machines it quotes, whether its quality system is certified and current, whether it can hold your specific tolerances with evidence rather than assertion, and what documentation ships with every order. Everything else — responsiveness, presentation, price — […]
CNC Machining Cost vs Lead Time: The Expediting Decision
CNC machining cost and lead time are the same decision seen from two directions. Every lever that shortens a CNC machining schedule is bought with money, and almost every lever that lowers unit price is bought with time. The useful question is never “how do I get this cheaper and faster” — it is “which […]
Contract Manufacturing Agreements for Precision CNC Parts
A purchase order buys parts. A contract manufacturing agreement buys capacity, a fixed specification and a known price for a period of time. The difference only matters when something goes wrong — a material grade goes short, a machine goes down, demand doubles — and at that point the agreement is the only thing standing […]
Alloy Selection and Machining Limits for Industrial Parts
Alloy selection is a machining decision before it is a metallurgical one. The grade you write on the drawing sets the cutting speed, the tool life, the achievable tolerance, the number of passes and, in several cases, whether the feature can be cut at all. Choosing it purely on a strength number and leaving the […]
The Real Cost of Tight Tolerances in CNC Machining
CNC machining quotes rarely come back high because a shop is expensive. They come back high because the drawing did not separate the three features that carry function from the forty that do not, so the supplier priced every dimension as if it mattered. That is a specification problem — paying the cost of tight […]
How to Specify Metal Surface Finishing for Machined Parts
In metal surface finishing, a callout that reads “black anodize” is not a specification. It does not say which anodize, how thick, whether the thickness is per surface or per diameter, what corrosion performance is required, or which surfaces must stay bare. Every one of those gaps is filled in by someone else, usually by […]