What we machine, how we handle tolerance, and what we will tell you before you order.
Materials
Every material we run is bought with certificates. If you need a specific mill, a specific heat number or a specific condition, say so at quotation stage and we will confirm before we cut.
| Material family | Grades we run regularly | Notes |
|---|---|---|
| Nickel & High-Temperature Alloys | Inconel 718 · Inconel 625 · MP35N | Work-hardening grades. Low surface speeds and rigid setups; held to size by rigid, high-accuracy CNC turning. |
| Beryllium Copper | C17200 (BeCu) | Non-magnetic and high-strength. Common in sensor, instrument and downhole components. |
| Carbon & Alloy Steel | 1045 · 4140 · 42CrMo · 20CrMnTi · 40Cr | The workhorse family. Good machinability, responds well to hardening and grinding. |
| Stainless Steel | 303 · 304 · 316L · 17-4PH · 420 · 440C | Shafts, sleeves and parts in corrosive or hygienic environments. |
| Aluminium | 6061-T6 · 7075-T6 · 2024 · castings | Lightweight structural and housing parts. Machines fast, needs care on thin walls. |
| Brass & Copper | H62 · C3604 · OFHC copper | Bearings, bushings, electrical and thermal parts. |
| Tool & Hardened Steel | H13 · SKD11 · D2 · S136 | Moulds, dies and punches — usually finished by EDM and grinding. |
| Magnesium & Titanium | AZ31 · Ti-6Al-4V | Weight-critical and high-performance parts. Quoted case by case. |
| Engineering Plastics | PEEK · POM (Delrin) · PPS · Nylon · PTFE | Machined plastic parts where metal is not the right answer. |
| Castings & Forgings | Aluminium and iron castings · steel forgings | We machine and finish supplied castings and forgings. |
Grades we do not normally stock. Special or hard-to-source grades are quoted case by case, with the lead time for material stated separately from the machining lead time. We would rather tell you it is six weeks than discover it after the order is placed.
Tolerances
A single number per process tells you almost nothing about your part.
It depends on the feature, the material, the hardness, the geometry, the batch size and how the part is fixtured. One published figure for “CNC milling” describes a shop’s best case, not your job.
Send the drawing. We will tell you specifically what we can hold repeatably on that part, which features are genuinely tight, and where a slightly relaxed tolerance would save money without affecting function.
We say so at quotation stage — not after you have inspected the parts.
We will tell you that too. A quotation that quietly ignores an impossible tolerance is worse than no quotation at all.
Quoted against production capability, not sample capability. The figure that matters is what holds across a run, not what was achieved once on a sample. Because that depends on your part, it is answered per drawing and per batch — in writing, before you order.
Surface finishing
Machining, grinding and deburring happen here. Below that, we manage the finishing supply chain so the part arrives ready to fit.
Deburred and cleaned, protected for shipment.
Ground diameters and bores to drawing.
Clear, black and colour anodising on aluminium.
Zinc, nickel, black oxide — managed to specification.
Uniform matte finish for visible components.
Hardening, tempering and stress relief, sequenced before grinding.
For stainless parts in corrosive or hygienic service.
Part numbers, heat codes and traceability marks.
Parts from these families
Hardened steel moves when you heat it and bronze cuts differently from aluminium, so the material decides the order of operations long before it decides the price. Grades and mill certificates are confirmed on the quotation for the material you specify.
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.
