CNC Machining Services for Science Labs

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  Key takeaways
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  Which shop fits which lab part
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  What tolerance a lab part can actually hold
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  Material choices that hold up in a lab
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  Surface finish and how it changes the fit
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  Documentation, inspection and traceability
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  Lead time, quantity and confidentiality
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  Seven steps to release a lab part order

A drawing that says ±0.005 mm across every dimension costs more than one that only tightens the features that matter. On a 5-axis machining center, ±0.005 mm is achievable on bores, seal grooves and mating faces. On a long aluminium plate, thermal drift across 300 mm can eat that budget on its own.

Ask which dimensions are functional. A mounting hole pattern that locates an optical bench needs a tight position tolerance. The outer profile of the same plate usually does not. Splitting the drawing this way often removes a full inspection pass.

Wall thickness is the other limit. Below 0.8 mm in aluminium or 0.5 mm in stainless, deflection during cutting becomes the dominant error, not the machine. If your design needs thinner walls, plan on a fixture and slower passes.

The size of the part sets the machine. GreatLight runs a maximum processing size of 4,000 mm and travels of 4,000 × 400 × 150 mm for long parts, plus 750 × 1,150 × 550 mm and 600 × 600 × 600 mm for general work. Small instrument components run on 500 × 500 × 450 mm and 500 × 310 × 200 mm machines.

Aluminium 6061-T6 is the default for instrument frames, mounts and housings. It machines fast, takes anodizing well and stays dimensionally stable at room temperature. For higher strength brackets, 7075 gives more stiffness but machines slower and is harder to anodize evenly.

Stainless 304 and 316L cover wet benches and chemical enclosures. 316L resists chloride attack better. Both work-harden, so a shop that feeds too aggressively will burn tools and leave a poor surface. 17-4PH is the pick when you need corrosion resistance plus higher yield strength.

Titanium TC4 (Ti-6Al-4V) and Inconel appear in vacuum and high-temperature hardware. Expect longer cycle times and more tool wear. These are not materials to choose casually; both raise the price per part well above aluminium.

Plastics matter as much as metals in lab work. PEEK and POM hold tight tolerances and resist solvents. PMMA and PC are common for transparent enclosures. Carbon fibre is available when stiffness-to-weight is the driver, but it needs dust control and edge finishing.

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  Wet chemistry316L or PTFE-lined parts; avoid plain carbon steel.
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  Vacuum serviceLow-outgassing aluminium or stainless; skip porous castings.
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  Optical mounts6061-T6 or titanium; both hold flatness after finishing.
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  Sample handlingPEEK, POM or 316L depending on solvent exposure.

Surface finish is not cosmetic in a lab. A seal groove at Ra 0.2–0.8 μm seals against an O-ring. The same groove at Ra 3.2 μm may leak. Specify the finish on the sealing face, not on the whole part.

Anodizing adds a few micrometres of oxide. That growth changes a bore that was cut to size. Hardcoat anodizing adds more. If a bore must stay at ±0.005 mm after coating, the shop has to cut it undersize and mask the thread.

Bead blasting and tumbling even out tool marks and remove burrs from fluidic channels. Brushing and polishing give a cleaner look on visible housings. Laser marking handles serial numbers and part IDs; the minimum character height is 1.5 mm.

GreatLight also runs electroless nickel, zinc, silver and gold plating, powder coating, black oxide and conductive anodizing. Each one has a thickness budget. Ask for it in numbers before you approve the drawing.

For a lab, the paperwork often matters as much as the part. A purchase order should say what travels with the shipment: material certificates, dimensional reports, first-article inspection, or a certificate of conformance. Not every part needs all four.

GreatLight inspects 100% of parts before shipment, with a raw material check, in-process monitoring and a final inspection. Reports are available on request. The qualification rate is 99.99%, which matters when a single instrument build cannot absorb a bad part.

Traceability is the piece buyers forget. If a batch of housings fails six months later, you want the heat number and the inspection record. Ask how long records are kept and whether they can be retrieved by part number.

The plant holds ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022. For lab instrument work, ISO 13485 and ISO 27001 are the two that usually come up: one covers medical-adjacent quality systems, the other covers information security.

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  Material certsHeat number and mill certificate for metal parts.
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  First-article reportWorth ordering on the first run of any new design.
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  Dimensional reportAsk for the critical dimensions only; full reports cost time.
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  Record retentionConfirm how long inspection data is stored.

Lab schedules are short. GreatLight returns a quotation and a free DFM analysis within 12 hours, and production can start within 24 hours of approval. Parts ship in 3–5 days. The historical late-delivery probability is below 2%. None of that replaces a schedule you agree to in writing.

There is no minimum order quantity. A single prototype and a 10,000+ part run are both normal. That matters because lab instruments rarely ramp the way consumer products do; you may need three units to prove a design and never order again.

Uploads are secure and confidential, and an NDA is available on request. If your instrument is unreleased, sign the NDA before you send STEP files, not after. It keeps the geometry out of the quoting backlog.

DFM feedback is the cheapest engineering you will get. If a channel is too deep for the tool, or a thread sits too close to a wall, better to hear it before the first chip is cut than after the parts arrive.