Machining's Services

How do you pick a machining process from a drawing?

Before any quote, a machinist reads a part the way you should: by what the geometry demands. The question is never "which machine do we have?" but "which cutting path does this shape call for?" A part with a centerline and round cross-section is a turning job. A part with flat faces, pockets, and slots is a milling job. A part that stacks both onto one body is a mill-turn job. And a surface that must seal, bear load, or spin true is a grinding job.

The cost of choosing wrong is real. A round part milled from a block can cost several times what it costs turned from bar, and a concentric part split across two machines picks up re-fixturing error that a mill-turn would never have. That is why the service starts with reading geometry, not with assigning a machine.

Which parts belong on a CNC lathe?

Any part that is fundamentally round — a shaft, pin, bushing, spacer, or fitting — belongs on a lathe, where the workpiece spins and the tool feeds along it. Turning is the fastest, cheapest way to produce a cylinder, a bore, a thread, or a groove, and it holds those features concentric to the part's own axis by construction, not by effort.

This facility runs 25+ turning centers plus Swiss-type lathes for long, slender parts such as medical pins and connector contacts. The turning envelope reaches Ø720 × 1280 mm, and tolerances hold to ±0.002 mm. If a drawing shows round stock with features on the OD and ID, it is almost certainly a turning job, and it should quote that way.

Which parts belong on a CNC mill?

A prismatic part — a housing, bracket, plate, manifold, or pocketed block — belongs on a mill, where the tool rotates and the workpiece is held. Milling produces flat faces, pockets, slots, holes, and 3D contoured surfaces, and it is the default for any part that is closer to a box than to a cylinder.

The shop runs 50+ 3-axis, 20+ 4-axis, and 20+ 5-axis mills with a working envelope up to 1300 × 700 × 600 mm. Three-axis handles parts you can finish from one direction; a fourth axis indexes the part to reach more sides without a new fixture; five-axis machines a complex surface in a single setup. More axes do not always mean a better part — they mean fewer setups, less fixturing error, and fewer chances for a dimension to drift.

When is mill-turn the right process path?

Mill-turn is for the part that refuses to be one or the other: a housing with a precision bore and mounting faces, a shaft with a hex and a cross-hole, a fitting that is round on one end and prismatic on the other. When round and prismatic features must stay concentric to each other, cutting both in one setup, on one machine, removes the error that creeps in when a part moves between a lathe and a mill.

This facility runs Brother M-series and Mazak QT-COMPACT mill-turn centers — some with dual spindles and Y-axis, some full 5-axis Mazak INTEGREX machines. A part that would otherwise need three or four setups can often be completed in one, which is why the DFM review always asks whether a mixed-geometry part can be consolidated onto a mill-turn rather than bounced between machines.

When does a part need grinding?

Grinding is the finishing word on a surface that must seal, bear, or spin true. Where turning and milling hold ±0.003 mm (milling) / ±0.002 mm (turning), grinding reaches ±0.002 mm — the band for bearing seats, sealing faces, and anything whose function turns on a few microns. It is not a replacement for cutting but a second, finer pass on the surfaces that earn it.

The shop runs 7+ grinders across surface, centerless, and cylindrical types. You signal the need for grinding by calling out a tight roundness, a fine surface finish, or a tolerance tighter than the cutting processes can hold. When the print demands it, the part simply moves onto a grinder after machining, and the extra step shows up in the quote as the difference between "machined" and "machined and ground."

Where do 5-axis and EDM fit into the decision?

Two geometry patterns pull a part beyond plain 3-axis work. A part with angled holes, undercuts, or a contoured surface that cannot be reached from a single direction is a 5-axis job — the tool tilts to reach the feature instead of the part being re-fixtured. A part with an internal sharp corner, a deep narrow slot, or an irregular cavity that no round cutter can reach is an EDM job, where a shaped electrode or a wire erodes the material away.

These are not everyday processes but decision points. If a drawing shows a square internal corner or a blind slot, the DFM review will flag that a milling cutter leaves a radius there and that EDM is the honest answer. Recognizing that before quoting is what keeps the part from arriving with a surprise.

How do secondary operations extend the process path?

Machining rarely ends at the machine. A part's process path continues through deburring, cleaning, and — when the drawing calls for it — surface treatment or heat treatment. This facility bundles anodizing (including hard anodizing), zinc, nickel, silver, gold, and chrome plating, powder coating, painting, brushing, and mirror polishing, along with outsourced vacuum, bright, carburizing, and nitriding heat treatment.

The practical effect is that you receive a finished part, not a machined blank you still have to send elsewhere. It also changes the timeline: any surface finishing pushes a part into the longer lead-time tier, and titanium stress relief above 500 °C is outsourced to a qualified partner because the in-house oven tops out at 500 °C. That is stated on the quote rather than discovered later.

Which materials pair with which process paths?

Material changes speed and cost more than geometry does. The same bracket in 6061 aluminum and in 316 stainless can differ severalfold in machining cost, purely because one cuts fast and the other wears tools. The right material is the cheapest one that still meets the functional requirement.

Material family	Grades run	Process-path note
Aluminum	6061, 6063, 6082, 7075, 2014	Turns and mills fast; anodizes well — default prototype choice
Stainless steel	303, 304, 316, 316L, 17-4PH	303 free-machining; 316L for corrosion; 17-4PH for strength after aging
Carbon / alloy steel	1018, 1045, 4140, 4340, 12L14	Carburizing or nitriding for wear parts
Brass / copper	C360, H62, C110	For electrical and thermal conductivity
Titanium	TA2, TC4 (Grade 2 / 5)	Stress relief above 500 °C outsourced
Engineering plastics	POM, PEEK, PTFE, nylon, ABS	For non-metal prototypes and insulators

Every incoming lot is checked by XRF spectrometer against its mill certificate before it reaches a machine, so a mixed or substituted alloy is caught at the door rather than on your receiving dock.

What are the MOQ and lead times by process path?

There is no production minimum — the MOQ is 1 piece, so you can prototype, validate, and iterate before committing to volume. Lead time is set by the number of process steps a part's geometry demands, not by a blanket promise.

Complexity	Approx. lead time	Typical profile
Simple	~3 days	Single process path, few operations, no finishing
Standard	~7 days	Multiple operations across one or two paths
Complex	~30 days	10–20 process steps, or surface finishing / heat treatment

A simple turned pin and a mill-turned housing with anodizing sit at opposite ends of that table — geometry and process steps, not part count, set the clock. State your target date and you will be told honestly whether it holds.

How do you read a quote that combines process paths?

Most real parts are not one process; they are a chain. A shaft is turned and then ground on its bearing journals; a housing is milled and then its bores are finished on a grinder. A quote for such a part should read as a chain of steps, not a single line, because each step is a decision with a cost and a reason behind it.

When you read the quote, look for the sequence rather than the total. A turned-and-ground shaft should show the turning as one step and the grinding as a second, deliberate step on the surfaces that earn it, not a blanket "machined and ground" that charges the grinding rate across the whole part. A shop that lists the path is showing you where your money goes; a shop that hides the path behind one number is asking you to trust the arithmetic, and the arithmetic is exactly what a good buyer should want to see.

The same logic applies to secondary operations. Anodizing, plating, deburring, and heat treatment are each a step on the chain, and each changes the timeline. A quote that names them separately lets you cut or keep them deliberately; a quote that folds them into one price removes your ability to choose. Reading the path is reading the cost.

How does process choice change the tolerance and finish you can hold?

Each process path has a natural envelope: the geometry it produces, the tolerance it holds, and the finish it leaves. Choosing the right one is a fit decision, and the fit matters more than the brand of machine.

Process	Geometry it serves	Typical tolerance	Typical finish	Relative cost
CNC turning	Round: shafts, pins, bushings	±0.002 mm	Ra 1.6–3.2 µm	Low
CNC milling	Prismatic: housings, brackets, plates	±0.003 mm	Ra 1.6–3.2 µm	Low–medium
Mill-turn	Round + prismatic, concentric	±0.003 mm (milling) / ±0.002 mm (turning)	Ra 1.6–3.2 µm	Medium
5-axis	Angled holes, contoured surfaces	±0.003 mm (milling) / ±0.002 mm (turning)	Ra 1.6–3.2 µm	Medium–high
Grinding	Critical diameters, sealing faces	±0.002 mm	Ra 0.4–0.8 µm	High
EDM	Sharp internal corners, deep slots	±0.003 mm (milling) / ±0.002 mm (turning)	Ra 0.8–1.6 µm	High

The table is a map, not a price list. A part that needs a sealing face at Ra 0.8 µm is going to visit the grinder no matter how well it mills; a part with a square internal corner is going to visit EDM no matter how cheaply it turns. The point of reading the map is to see, before you quote, which paths your geometry is already committed to, and which ones it can avoid by a small design change. That foresight is where a DFM review pays for itself, because the cheapest process is usually the one a small change lets you use.

What we run, and what you can verify

Capability	Standard
ISO 9001:2015 cert	116024/A/0001/UK/En (verifiable)
IATF 16949:2016 cert	131941/A/0001/SM/En (design exclusion 8.3 disclosed)
ISO 14001:2015 cert	116024/B/0001/UK/En
CNC milling tolerance	±0.003 mm (process capability, repeatable)
CNC turning tolerance	±0.002 mm (process capability, repeatable)
Grind + wire-EDM tolerance	±0.002 mm (process capability, repeatable)
5-axis equipment	Mazak VARIAXIS I-600 + INTEGREX I-250H S (10+ centres)
Swiss-type lathes	TSUGAMI B0206-III / B0205-III + STAR SR-32JII / SR-32J Type N Type B + Citizen Cincom A20-3F7 (10+ lathes)
CMM inspection	Hexagon CMM (20+ inspection instruments)
Material verification	XRF on incoming; mill cert travels with the part
Capability indices	Ppk ≥1.67 on key characteristics; Cpk ≥1.33 ongoing (stage + sigma estimator named)
Service area	Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa; worldwide from China

This is the audit you should be able to run on any partner, including us. Any field that comes back vague or unverifiable is a field the partner has not invested in.

Frequently Asked Questions

Standards referenced on this page

• ASTM B211/B211M-19 — Standard Specification for Aluminum-Alloy Rolled or Cold Finished Bar, Rod, and Wire
• ASTM A276/A276M-17 — Standard Specification for Stainless Steel Bars and Shapes
• ISO 9001 — Quality management systems — Requirements