A 316L stainless steel collar is turned complete in one cycle, so threads, grooves and cross holes keep their relationship to the turned datums. Below is the practical detail on 316L stainless steel collar supplied for electronics: CNC turning with live tooling, sub-spindle back working and in-process gauging, the tolerance that is held, the finish applied and the documents issued with the parts.
Tolerance is applied where it does work rather than across the whole drawing. Critical features are held to ±0.01 mm, non-critical dimensions follow the general machining tolerance, and the difference is stated in the quotation rather than discovered later.
Specification
| Process | Cnc turning with live tooling, sub-spindle back working and in-process gauging |
|---|---|
| Material / configuration | 316L stainless steel |
| Size / capacity | Ø 25 mm × 120 mm |
| Tolerance | ±0.01 mm |
| Surface finish | as machined, Ra 0.8 µm or better |
| Application | collar for electronics |
| Inspection | Dimensional report, material certificate, first article report on request |
| Lead time | 7–15 working days for samples, 3–4 weeks for production |
| Minimum order | 1 piece for prototypes, from 50 pieces for production pricing |
Manufacturing process
Work is carried out with CNC turning with live tooling, sub-spindle back working and in-process gauging. Tooling, speeds and fixturing are recorded with the part number, so a repeat order starts from a proven process instead of a fresh setup.
Material is purchased against a certificate and checked on receipt, so the composition is known before any cutting starts. Work in progress is identified by part number and operation, and the finished parts are deburred, cleaned and protected before they leave the machine area.
Typical applications
Most of the work supplied in this category falls into the following examples.
- Motor and gearbox shafts.
- Pump and valve bushings.
- Sensor mounting collars.
- Hydraulic adaptors and fittings.
- Roller and idler spindles.
Quality control and documentation
Critical features are measured on calibrated equipment in a controlled room, and the results are filed with the job so that a repeat order can be compared with the first.
Material certificates to EN 10204 3.1, dimensional reports and first article inspection reports are issued with the shipment where the application requires them. Calibration dates and measurement uncertainty are recorded alongside every result.
Ordering, lead time and packaging
Packaging is specified by the part: individual protection for finished surfaces, separation for assemblies, and export crating with a packing list for shipment.
Frequently asked questions
Can milled features be included?
Yes. Live tooling and a C-axis produce flats, cross holes and keyways in the same cycle, which keeps their relationship to the turned datums rather than adding a second setup tolerance.
What tolerance is normal for turned diameters?
±0.01 mm is routine and ±0.005 mm is achievable on small diameters with a finishing pass and in-process gauging. Concentricity is usually held within 0.02 mm.
How long does delivery take?
Sample parts are typically shipped in 7 to 15 working days after drawing approval. Production batches run 3 to 4 weeks depending on quantity, finishing and inspection requirements.
Drawings are reviewed for manufacturability before quotation, and any feature that adds cost without adding function is pointed out at that stage rather than after the parts are made.
