Swiss-Type & CNC Turning

Drawing review example

Check the remaining wall before quoting a hollow screw

Illustrative drawing review. Confirm the route, dimensions and acceptance for your part.

What drives the route: Illustrative section only: an outside diameter of at least 7.96 mm and a bore of at most 4.04 mm leave 1.96 mm radial wall if concentric. With up to 0.15 mm centre offset at that section, the minimum wall is (7.96 − 4.04) ÷ 2 − 0.15 = 1.81 mm. This simple circular check excludes threads, cross-holes and local transitions.
What changes the quotation: Identify the minimum wall and bore axis where they matter, rather than only giving nominal diameters. A long bore, interrupted cut, tighter position requirement or second workholding setup can change cycle time, tool access and the inspection method.
How to release the sample: Check bore and outer geometry in the agreed datums and after release from the fixture. Separately verify hole intersections and burrs where a cable or fluid passes. The section calculation is a geometry check, not a pressure or load rating.

Related fastener families

Related technical guides

Continue through the process

Process decision and release matrix

Resolve these items during technical review. Each row identifies a decision or evidence requirement; it does not imply a universal process limit or an in-house equipment claim.

Decision	Required input	Release question
Setups and datums	Identify locating faces, axes and relationships between steps	Which features should share a setup to preserve the required relationship?
Bores and local features	Show depth, diameter, intersections, flats and tool access	Can the feature be machined and checked with the proposed access?
Stock and final condition	Specify grade/condition and later treatment or coating	Which dimensions need allowance or acceptance after later processing?
Sample to production	Identify route differences and repeated batch needs	Is the approved prototype representative of the final production route?

AFTER PROCESSING

See the resulting feature.

Visual references help explain geometry and finish. Material properties, coating performance and acceptance require the agreed inspection methods.

CNC turning — stepped geometry — Process outcome reference; final requirements follow the approved drawing.

Inputs and outputs for Swiss-Type & CNC Turning

The process review begins with Hollow & Through-Hole Screws, Eccentric & Angled Head Screws, Multi-Step & Multi-Shoulder Screws, Fine & Extra-Fine Pitch Screws and the actual drawing, not a generic equipment list. Identify the incoming stock or part condition and the dimensions that must remain controlled at this stage.

Use the process topics above to resolve where it fits; swiss-type and fixed-head choices; design inputs; cost and properties. Record the selected requirements in the order specification. A process name does not establish the resulting tolerance, property class or inspection coverage.

Coordinate the next operation

The next review may involve Secondary & Precision Operations or Thread Rolling, Cutting & Tapping. Check which surfaces are used to locate the part, whether the next operation changes dimensions and at what stage final acceptance is measured. Where a requirement cannot be checked after assembly or finishing, agree an intermediate check as well as final verification.

For samples involving tooling, the typical lead time is approximately 10–15 days, subject to drawing review and confirmation of material, finishing and inspection scope. The complete route determines the confirmed schedule; the duration is not a promise for each individual process.

CONNECTED SPECIFICATION TOPICS

Connect the part to its requirements.

Review these related topics for this design or route. Grade, treatment, geometry and acceptance remain drawing-specific.

MATERIAL & FINAL CONDITION

Swiss-Type & CNC Turning

Where it fits

Swiss-type and fixed-head choices

Design inputs

Cost and properties

Check the remaining wall before quoting a hollow screw

Related fastener families

Related technical guides

Continue through the process

Process decision and release matrix

See the resulting feature.

Inputs and outputs for Swiss-Type & CNC Turning

Coordinate the next operation

Connect the part to its requirements.

SUS304 & SUS316 Stainless Steel ↗

Aluminum Alloys ↗

Copper ↗

Electronics & Optical Equipment ↗

Molds, Tooling & Test Fixtures ↗

Shoulder & Step Screws ↗

Discuss the route behind your drawing.