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CNC Turning

Shafts, sleeves, connectors and threaded parts — turned to drawing, and milled in the same setup where the feature calls for it.

Turning is where most precision assemblies start. The department runs from simple pins and spacers to mill-turn work where bores, slots and cross-holes have to stay concentric with the main axis — and where a second operation would mean re-establishing datums you already controlled.

Because grinding, gear cutting and EDM sit in the same building, a turned part that needs heat treatment and a ground journal does not leave the floor between operations. The engineer who quoted it signs the inspection report.

What we make here

Parts that come through this department.

Shafts, pins and spindlesSleeves, bushings and bearing seatsConnectors, adaptors and fittingsThreaded parts and studsFlanges, collars and ringsTurned housings with milled features

Typical work: small to medium batches where repeatability across the run matters more than the price of the first piece.

How the work runs

From drawing to shipping, in this order.

Drawing and DFM checkTolerances, thread forms and any feature that needs a second operation are reviewed before the program is written.

Program and fixtureCam program proved on the machine; soft jaws or a dedicated fixture turned to the part where concentricity matters.

First articleThe first piece is measured in full and photographed for your approval before the run continues.

Run and packIn-process checks every 20–50 pieces, final inspection against the drawing, parts packed to survive the freight.

Materials, equipment and inspection

The practical detail.

Materials for this process

Carbon and alloy steels, stainless steels, nickel and high-temperature alloys, aluminium, brass and copper, titanium and engineering plastics — turned from bar, or from material you supply and we verify on receipt.

See the full material list

Equipment and inspection

CNC lathes and mill-turn machines with live tooling for cross-holes and flats. Threads checked with go/no-go gauges, diameters with micrometers and bore gauges, profiles on the vision measuring machine.

Full equipment list

Capacity

What the department can actually hold.

Feature	Range	What to know
Max swing over bed	Ø420 mm	Larger diameters quoted with the chuck removed
Max turning length	1,000 mm	Between centres, tailstock supported
Bar capacity	Ø5–51 mm	Bar feeder for unattended runs above 500 pieces
Live tooling	6,000 rpm driven tools	Cross-holes, flats and slots in the same setup
Threads	M1.6–M64 · UN · BSP · NPT	API and premium connections quoted to the drawing
Roundness	0.003 mm achievable	On a ground or hard-turned journal
Surface finish	Ra 0.4 µm as turned	Ra 0.2 µm where the part is subsequently ground

Ranges are indicative. The envelope that matters is the one your part needs — send the drawing and we confirm the exact machine before quoting.

Parts we have machined

Real components, photographed on our own bench.

**Turned component**CNC turning · OD ground

Where the money goes

What actually drives the price of this work.

Setup and programming A one-off cost per part number. It amortises on repeat orders because the program, fixture and offset file are kept under your part number.
Material and stock removal Bar stock costs more per kilo than plate, but wastes less. On parts above 200 mm diameter we quote both routes.
Tolerance and inspection Moving from ±0.02 to ±0.005 roughly doubles inspection time and slows the cycle. It is a real cost, not a negotiating position.
Batch size The same part at 50 pieces and at 5,000 pieces is two different prices. Above 500 pieces we quote bar-fed, which removes the handling between operations.
Secondary operations Heat treatment, grinding, anodising and passivation are quoted as separate lines so you can see what each one adds.

Straight answers

Questions buyers ask about this work.

What information do you need to quote a turned part?

The drawing, the material and grade, the quantity and the date you need the parts. If a critical feature is ambiguous we ask rather than assume — a one-line question now is cheaper than a rework later.

Can you work from a sample instead of a drawing?

For straightforward parts, usually yes. We measure the sample, send you a drawing for approval, and machine against the approved drawing so both sides are working from the same document.

How do you hold concentricity across two setups?

By machining as much as possible in one setup, and where that is not possible, by turning soft jaws or a fixture to the part rather than re-chucking on a scroll. Where the tolerance is tight, the outside diameter is ground after hardening.

Keep reading

Where this usually leads next.

CapabilityCNC Milling CapabilityOD Grinding IndustryMWD / LWD & Downhole

Request a quotation

Send us a drawing. Get an engineering answer, not a price list.

Tell us the part, the material and the quantity. An engineer reviews your drawing and replies within one working day — usually with a suggestion on how to make it cheaper.

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