| Typical machine configuration | 2-axis CNC lathe; manual tool changes may be used for simple work. | CNC turning center with automatic tooling, bar feeder, and parts catcher. | Multi-axis mill-turn equipment with live tooling, sub-spindle, and automated probing. | Machine axis configuration, spindle capacity, tooling system, automation, and workholding method. |
| Recommended part complexity | Cylindrical parts, shafts, bushings, spacers, and basic threaded components. | Stepped shafts, flanges, grooves, tapers, multiple diameters, and standard threads. | Parts requiring off-center milling, cross-holes, synchronized operations, or reduced setups. | A sample process plan, number of setups, tolerance stack-up, and collision-risk review. |
| Typical dimensional tolerance | Approximately ±0.05 mm for suitable geometries and stable materials. | Approximately ±0.02 to ±0.05 mm, depending on size, geometry, and inspection method. | Approximately ±0.005 to ±0.02 mm for selected features under controlled conditions. | Tolerance capability study, actual inspection records, temperature control, and feature size limits. |
| Surface roughness capability | Typical turned surfaces around Ra 3.2–6.3 µm. | Typical finished surfaces around Ra 1.6–3.2 µm. | Ra 0.8–1.6 µm by optimized turning; lower values may require grinding or polishing. | Required Ra value, measurement direction, cutoff length, tool wear controls, and post-processing. |
| Common material groups | Aluminum alloys, brass, engineering plastics, and free-machining steels. | Carbon steel, stainless steel, aluminum alloys, brass, bronze, and acetal-based plastics. | Titanium alloys, nickel-based alloys, hardened steels, medical-grade materials, and high-performance polymers. | Material grade, heat-treatment condition, hardness, stock certification, and chip-control requirements. |
| Maximum work envelope | Often suitable for parts up to approximately 200–300 mm diameter and 300–500 mm length. | Often suitable for approximately 300–500 mm diameter and 500–1,000 mm length. | Configured for either very small precision parts or larger parts exceeding 500 mm diameter and 1,000 mm length. | Maximum turning diameter, distance between chucks, bar capacity, chuck size, and actual usable envelope. |
| Production volume suitability | Prototype and low-volume batches, generally 1–50 pieces. | Recurring small-to-medium production, generally 50–10,000 pieces. | High-mix precision work or repeat production above 10,000 pieces when automation is justified. | Setup time, cycle time, changeover method, machine utilization, and batch-size pricing. |
| Threading and hole-making | Standard external and internal threads; axial drilling with basic tooling. | Metric and inch threads, deep boring, reaming, grooving, and drilling. | Synchronized threading, cross-drilling, angled holes, micro-features, and complex internal geometries. | Thread standard, pitch, class or tolerance, hole depth-to-diameter ratio, and tool-access limitations. |
| Inspection equipment | Calipers, micrometers, gauges, and basic surface-finish measurement. | Coordinate measuring machine, height gauge, thread gauges, and documented inspection reports. | Temperature-controlled inspection, optical measurement, form measurement, and full traceability. | Calibration records, sampling plan, first-article inspection, material certificates, and report format. |
| Typical lead-time target | Approximately 3–10 business days for simple prototypes, subject to material availability. | Approximately 1–4 weeks for repeatable production parts and standard finishes. | Approximately 3–8 weeks when special materials, complex programming, inspection, or heat treatment is required. | Material procurement, programming queue, outside processing, inspection time, and promised ship date. |
| Cost drivers | Programming, setup, raw material, machining time, and basic inspection. | Tooling, cycle time, batch size, material waste, finishing, and quality documentation. | Special tooling, low material machinability, multiple operations, tight inspection, and process validation. | Itemized quotation, setup charges, minimum order quantity, scrap policy, and revision-change costs. |
| Best-fit project type | Functional prototypes, simple replacement parts, fixtures, and non-critical components. | Industrial components, equipment shafts, housings, fittings, and repeat production assemblies. | Aerospace, medical, energy, robotics, instrumentation, and other tolerance-sensitive applications. | Application risk, regulatory requirements, drawing notes, functional tolerances, and end-use environment. |
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