Process & Technical
How to prepare an RFQ, technical drawings, tolerances, quantities and the order process with a CNC contract manufacturer in Turkey.
Deep Hole Drilling and Thin-Walled Parts: Challenges, Methods and Design Recommendations
Holes longer than five times their diameter and parts with wall thickness below 1 mm are two classic challenges that multiply cost and risk in CNC machining. Drill drift, chip packing and heat in deep holes; clamping deformation, chatter and thermal expansion in thin walls. This article covers both from the supplier's and the designer's perspective: when a hole counts as deep, the problems, methods including gundrilling and BTA, deep holes on Swiss-type lathes, when a wall counts as thin, workholding solutions, design recommendations, cost impact and FAQs.
Technical Read more
Threading: Metric, UNF, BSP and NPT Threads and Measurement Methods
Threads are one of the features most frequently causing non-conformance on CNC parts: wrong standard, unclear tolerance class, missing thread length, disagreement over the measurement method. This article turns the subject of threads in contract manufacturing into a practical guide: thread standards, the most common confusions, what tolerance classes mean, production methods, measurement methods, how to define a thread on the drawing, frequent non-conformances and their causes, and FAQs.
Technical Read more
Single Parts or Assembled Sub-Groups? What to Buy from a Contract Supplier
Is it more advantageous to buy only machined parts from a contract supplier, or a sub-group with bearings and pins fitted, coated and tested? The answer depends on the product, the quantity and your organisation. This article systematically covers the decision: definitions of the two models, the advantages and risks of sub-group sourcing, which sub-groups are suitable for contract assembly, a cost comparison example, a decision matrix, a phased transition proposal and how to prepare an assembly instruction.
Decision Read more
The 12 Most Common Mistakes in Overseas CNC Sourcing and How to Avoid Them
Most problems in sourcing CNC parts from abroad start not on the supplier's machine but in the buyer's process errors. This article lists the 12 most common mistakes we have observed in dozens of first orders, together with a practical fix for each: incomplete RFQ documents, looking only at unit price, skipping the sample stage, stating documentation requirements late, confusing Incoterms and VAT, moving all volume at once, neglecting revision management, tolerance errors, unclear communication channels, never seeing the supplier, discussing payment terms late and ignoring cultural and time differences.
Guide Read more
How to Prepare a Technical Drawing for a Contract Manufacturer: Complete Checklist
Most delays and price differences in contract manufacturing start not at the machine but on the drawing: a missing material definition, an unspecified general tolerance, a 3D model and PDF that contradict each other, a forgotten thread standard. This article is a complete checklist for the drawing itself: title block, material definition, dimensioning logic, tolerances, surface finish, heat-treatment and coating notes, critical features, revision management, the file package, the ten most common errors and cultural differences on drawings sent to Turkey.
Technical Read more
Small Workshop or Large Factory? Choosing the Right CNC Supplier Size in Turkey
Turkey's CNC contract manufacturing ecosystem ranges from 5-machine family workshops to 200-machine automotive suppliers. Which size is right for you? This article compares small and large suppliers through the eyes of a purchaser placing work from abroad across eight dimensions — price, flexibility, quality-system maturity, capacity and dependency risk, communication, technology breadth, certification and financial resilience — shows the problems caused by size mismatch, offers a decision matrix by part profile and explains how to verify fit with a remote audit.
Decision Read more
Done-in-One Machining on Mill-Turn Centres: When Does It Make Sense?
Machining a part first on a lathe and then on a mill means two set-ups, two programmes, two waits and two sources of error. Mill-turn centres and CNC lathes with live tooling reduce this chain to a single set-up. This article explains from the contract-manufacturing perspective which parts benefit, what single-set-up machining gains in geometric accuracy, lead time and cost, where the technology reaches its limits, what to ask the supplier at quotation stage and how the designer can make the part more suitable.
Technical Read more
3-Axis, 4-Axis, 5-Axis Milling: Which Does Your Part Really Need?
"5-axis" always sounds better; yet the vast majority of milled parts are produced more cheaply and at the same quality on 3 or 4 axes. This article explains what the number of axes means, which geometries genuinely require 4 or 5 axes, the difference between 3+2 (positional) and simultaneous 5-axis, the cost effect through hourly rate and number of set-ups, and the design decisions that make your drawing producible with fewer axes.
Technical Read more
Tolerance Selection: Is ±0.01 mm Really Necessary on Every Dimension?
The most expensive line on a technical drawing is often the tolerance line: writing ±0.01 mm instead of ±0.1 mm can double the price of a part without changing its function. This article explains why cost rises exponentially as tolerances tighten, which machine and measuring infrastructure the different tolerance bands require, how to determine the functional tolerance and what realistic tolerance values are for turned and milled parts.
Technical Read more