Texas Precision CNC Processing Services: What to Check Before You Order

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  Key takeaways
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  Buyer criteria for Texas precision CNC processing services
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  Tolerance and capability in Texas precision CNC processing services
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  Lead time, MOQ and quote details to compare
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  Material and finishing choices that change the price
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  How to qualify a supplier for Texas precision CNC processing services
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  Step by step: from drawing to shipped parts

The first question on any RFQ is what tolerance the shop can actually hold on your geometry, not what the brochure says. GreatLight works to ±0.005 mm (±0.0002 in) on qualified features. That number comes from the machine, the fixturing and the inspection loop together. A shop that quotes ±0.005 mm without asking about wall thickness or feature depth is guessing.

Geometry decides which machine runs the job. A 5-axis center can cut five faces in one setup, so a part with pockets on four sides avoids three re-clamps and the alignment stack-up each one adds. For a long shaft with turned and milled features, a mill-turn center removes the second operation entirely. A simple bracket does not need either. Paying 5-axis rates for a flat plate drives cost up with no accuracy gain.

GreatLight runs 127 high-precision CNC machines, including 16 simultaneous 5-axis machining centers, 16 mill-turn centers, 12 four-axis mills and 27 three-axis machines. Maximum processing size is 4,000 mm, with travel envelopes such as 4,000 × 400 × 150 mm for long parts and 750 × 1,150 × 550 mm for plate work. A Ø400 mm rotary table covers round and index-machined parts.

Surface finish follows the same logic. As-machined surfaces land at Ra 1.6–3.2 μm. A high-quality finish runs Ra 0.8–1.6 μm, and fine finishing reaches Ra 0.2–0.8 μm. Tell the shop which faces need the fine finish. Specifying it across the whole part adds cycle time and cost without helping the function.

Lead time only means something when it has a start point. Ask whether the clock begins at drawing release or at purchase order. At GreatLight, quotation and free DFM analysis come back within 12 hours, production can start within 24 hours, and parts ship in 3–5 days. Historical late-delivery probability sits below 2%. Those numbers assume the drawing and material are frozen. A change to either one resets the schedule.

MOQ is where small teams get squeezed. A supplier that wants 500 parts before quoting a prototype is not set up for engineering work. GreatLight has no minimum order quantity and quotes from one prototype to 10,000+ part runs on the same process. That matters when you are validating a design and cannot commit to volume yet.

Read the quote itself, not just the price. A useful quote lists material grade, stock size, machine, tolerance per feature, finish, inspection method and lead time. If it lists only a number and a ship date, you have no way to compare it against a second supplier. Ask for the DFM notes too. Thin walls, deep pockets and tight corner radii are the usual cost drivers, and they are cheaper to fix on paper.

Certification scope is part of the comparison. GreatLight holds ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022. Match the certificate to your industry. Automotive and EV work leans on IATF 16949, medical device parts on ISO 13485, and anything with customer drawings on ISO 27001 for document control.

Material grade drives machinability, and machinability drives cost. Aluminum 6061-T6 cuts fast and holds tight tolerance, which makes it the default for housings and fixtures. Grades 2024 and 7075 machine well but move more after stress relief, so plan a roughing pass before finishing on thin sections. Stainless 303 and 304 are common; 17-4PH (SUS630) suits parts that need strength plus corrosion resistance. Titanium TC4 (Ti-6Al-4V) and Inconel cut slowly and wear tooling, so budget more cycle time.

On the plastics side, POM and PA work for functional prototypes, PEEK for high-temperature or chemical exposure, and PC or PMMA where you need clarity. Carbon fibre composites need diamond tooling and dust control. A supplier who lists only aluminum and steel will outsource the rest, and that adds days.

Finishing is where hidden cost lives. Anodizing comes in clear, color, hardcoat and conductive types, and each changes masking requirements. Electroless nickel, zinc, silver and gold plating are available for conductivity or wear. Powder coating and black oxide handle larger frames. Bead blasting, tumbling, brushing and polishing change both look and surface roughness. Laser marking works down to a minimum character height of 1.5 mm, so a small serial number may need a different method.

Give the finish spec with the drawing. A note that says "anodize" without a type and thickness will come back as a question, and that question costs a day.

Start with the parts you cannot afford to scrap. For aerospace brackets, the check is whether the shop can hold position tolerance across multiple setups and provide the inspection data to prove it. The aerospace prototyping workflow covers thin ribs and hard alloys where setup count is the main risk. A shop that cannot show its setup plan is a shop that will find the error on the CMM after the part is finished.

For automotive and EV parts, IATF 16949:2016 is the baseline, and process control matters more than one good sample. Ask how first-article inspection is handled and how changes are tracked. For medical devices, ISO 13485:2016 plus a clean handling process and material traceability are the entry conditions. ISO 27001:2022 covers the document side: your drawings and CAD files should sit behind controlled access.

Prototype shops and production shops are not the same. A prototype supplier optimizes for speed and will machine around a design flaw. A production supplier stops and flags it. You want the second behavior before you commit to tooling. GreatLight operates 3 wholly-owned plants across 7,600 m² with 150 technicians, which supports both prototype and repeat production under one quality system.

Confidentiality is a real criterion, not paperwork. Uploads are secure and confidential, and an NDA is available on request. If your drawings carry export-control or customer-owned data, confirm the document control process before you upload anything.