A working reference library for engineers and shop teams: material selection, surface finish choice, tolerance planning, and how those decisions map onto 127 CNC machines.
None of these are exotic. They are the ones we see most often in incoming RFQs.
A part gets specced in 6061 because the last one was. Then it needs anodizing with a tight cosmetic spec, or it runs hot and warps during milling. The alloy was never wrong on paper, only wrong for the process steps that follow. Re-cutting a batch costs weeks.
Ra 0.4 μm reads fine in a drawing note. Applied across a whole housing instead of the sealing face, it adds polishing passes, hand work, and cost on surfaces nobody inspects. The function only needs one face at that level.
A single ±0.005 mm title block forces slow passes, extra setups, and more inspection time on features that sit in clearance holes. Tighten only what mates. Everything else can run at ±0.1 mm and ship faster.
A model with a 0.5 mm internal corner, no tool relief, or a deep pocket at 8:1 depth-to-width goes straight to CAM. The cutter cannot reach it. Rework means a new design revision before any chips are cut.
Short, specific answers instead of general advice.
Most material questions we get are not about strength. They are about what happens after machining: how the part anodizes, welds, or holds flat after heat. A 7075 bracket and a 6061 bracket can both pass a load check, then behave completely differently on the finishing line.
We keep stock in 6061, 6061-T6, 2024, 5052, 5083, 6063, 6082, 7075 and ADC12 aluminum; 303, 304, 316, 316L, 420, 430, 431, 440C and 17-4PH stainless; 1018, 1045, 4130, 4140, 4340 and A36 steel; plus titanium TA1, TA2, TC4 and magnesium AZ31B and AZ91D.
A print with one global tolerance band ties up machine time. Local callouts let the shop run roughing passes fast and slow down only on the bearing bore, the seal groove, or the mating face. That single change often moves a quote more than switching material.
Our floor holds ±0.005 mm (±0.0002 in) on critical features, with as-machined surfaces at Ra 1.6–3.2 μm, standard finishing at Ra 0.8–1.6 μm, and fine finishing down to Ra 0.2–0.8 μm when a print demands it. We check 100% of parts before shipment, with raw material, in-process and final inspection, and reports on request.
Common shop questions, answered in one line.
| Material | Typical use | Watch out for |
|---|---|---|
| 6061-T6 | General housings, brackets | Softer than 7075 in wear areas |
| 7075 | High-strength aerospace parts | Harder to weld, anodize color shift |
| 304 stainless | Food and general corrosion | Galling on threads without lubricant |
| 316L stainless | Medical, marine, chemical | Lower machinability than 303 |
| 4130 steel | Tubes, frames, welded parts | Needs heat treat for full strength |
| 17-4PH stainless | Shafts, high-strength fittings | Heat treat condition changes size |
| POM (acetal) | Bushings, wear strips | Creeps under sustained load |
| PEEK | High-temperature insulators | Expensive; use only where needed |
One shop, one quote, from prototype to 10,000+ parts.
16 simultaneous 5-axis centers handle contoured surfaces and complex geometry in fewer setups. Useful when a part has angled features a 3-axis machine cannot reach.
27 three-axis machines, 12 four-axis mills, and 16 mill-turn centers cover prismatic parts, shafts, and turned-then-milled work in one operation.
No minimum order. From one prototype to short runs, with quotation and free DFM analysis inside 12 hours and production starting within 24 hours.
Brackets, panels, and enclosures up to 4,000 mm processing size, with bending, forming, and finishing handled under the same roof.
Anodizing, plating, powder coating, black oxide, bead blasting, tumbling, brushing, polishing, and laser marking with a 1.5 mm minimum character height.
SLA and FDM parts, vacuum casting, and metal die casting for early fit checks before committing to a machined or cast production path.
Pick the envelope that fits the part.
| Capability | Size or count | Best for |
|---|---|---|
| Large travel | 4,000 × 400 × 150 mm | Long rails and profiles |
| Medium travel | 750 × 1,150 × 550 mm | Enclosures and plates |
| Compact travel | 500 × 500 × 450 mm | Small precision housings |
| Rotary table | Ø400 mm | Round and indexed features |
| 5-axis centers | 16 machines | Contoured and angled work |
| 3-axis machines | 27 machines | Flat plates and simple prisms |
Every figure below comes off our own equipment list and inspection records.
Three wholly-owned plants across 7,600 m², staffed by 150 technicians. We have run the same materials long enough to know where each one bites back.
Equivalent to ±0.0002 in. Held on critical features, verified by in-process monitoring and final inspection on 100% of parts.
16 five-axis, 12 four-axis, 27 three-axis, and 16 mill-turn centers. Capacity spreads across part families instead of one bottleneck.
Long parts stay on one machine. Fewer setups means fewer datum shifts and less accumulated error across a feature chain.
Parts that pass final inspection. When something is out, we say so before shipment rather than after it lands.
Parts typically ship in 3–5 days. We track this because a missed date costs our customers more than the part does.
Thin-wall aluminum parts that must hold flat after machining. We rough, stress-relieve where the process allows, then finish cut.
IATF 16949:2016 process control, traceable material, and in-process checks on every run, prototype through production volume.
ISO 13485:2016 workflow, 316L and titanium parts, deburred and cleaned, with inspection reports on request.
Pick 6061 when the part needs anodizing consistency, welding, or lower cost, and the load path is not extreme. Pick 7075 when strength-to-weight matters more than finish appearance or weldability.
One practical check: if the bracket will be clear anodized and judged on color, 7075 can show uneven tone. If it lives in a high-vibration mount and weight is tight, 6061 may be too soft.
Not always. 316L has lower carbon, which helps after welding because it reduces carbide precipitation at the weld zone. For a part that is only machined and never welded, 316 and 316L behave much the same in service.
316L is also slightly softer and can gum up on small threads and deep bores. If the part is a welded assembly for a chemical line, use 316L. If it is a turned fitting, choose what your corrosion spec actually calls for.
Ra 0.2–0.8 μm is a sound target for an O-ring or gasket sealing face. That range is achievable with fine finishing rather than hand polishing across the whole part.
Do not put that callout on the full print. Standard finishing at Ra 0.8–1.6 μm covers most non-sealing surfaces, and as-machined Ra 1.6–3.2 μm is fine for hidden internal faces.
It pays off when a part has features on multiple faces that would otherwise need three or four setups, or when the geometry is contoured and a 3-axis cutter cannot reach it without a long tool.
For a flat plate with holes on one face, 3-axis is faster and cheaper. For an impeller, a medical housing with angled ports, or a part where every re-setup adds datum error, 5-axis usually wins.
Tighten only the features that mate. A bearing bore, a press fit, or a seal groove may need ±0.005 mm. Clearance holes and non-critical slots rarely need better than ±0.1 mm.
A global tight tolerance slows every operation and adds inspection time. Local callouts let the shop run fast where it can and slow where it must.
Quotation and free DFM analysis come back within 12 hours, and production can start within 24 hours once drawings and material are confirmed. Parts typically ship in 3–5 days.
If the design is still moving, we would rather flag the DFM issues first. Fixing a 0.5 mm internal corner or a deep pocket before CAM saves a revision.
There is no minimum order quantity. We run one prototype or a 10,000+ part production run on the same floor, on the same machines.
Prototype quantities often go through the same inspection path as production, so the first article tells you something real about the process.
Uploads are secure and confidential. An NDA is available on request before you send any files.
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Upload your part and we will return a quote with DFM notes, no minimum order, and inspection on every piece.
12-hour quote100% inspectionNo minimum orderNDA on request
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
CNC Metals 13 grades
CNC Plastics 10 grades
Machines & processes 12 options
Surface & post-processing 10 options
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